Kilwaughter Chemical Co Ltd K REND EXTERNAL WALL
Contents
1. corner bead i corner bead low modulus low modulus silicone sealant new sill silicone sealant new sill detail at reveal flush detail at reveal recessed low modulus silicone sealant detail of sill 16 10 Installation continues until the whole wall is completely covered including where appropriate the building soffits Movement joints and render beads 16 11 Movement joints in the substrate must be continued through the system This may necessitate the use of back to back full system stop beads with a sealant and backer strip depending on the width of the joint and the degree of movement anticipated Additional movement joints in the insulation system are determined by the Certificate holder at the time of initial survey see Figure 7 Page 13 of 16 Figure 7 Expansion joint movement joint bead fixed to insulation with Firtree fixings Reinforcing 16 12 The K Rend HP14 Base should be mixed with from 4 to 5 litres of potable water per 25 kg bag for a minimum of 5 minutes with an electric paddle mixer to disperse the additives Conventional concrete mixers are unsuitable for this purpose Corner beads with integral glassfibre wings should be fitted to all corners using the K Rend HP14 Base2. A thickness of 3 mm of the basecoat should be applied to the surface of the insulation using a stainless steel trowel or a render pump The glassfibre mesh should be embedded in the wet render using the trowel The sheets of mesh should be lapped by a minimum of 100 mm Diagonal patches of mesh approximately 300 mm by 200 mm should also be installed at the corners of window door openings see Figure 8 16 13 The second 3 mm thick coat of basecoat should be applied to give a total render thickness of 6 mm The surface of the basecoat should be sponged to provide a smooth surface for the K Rend Primer TC and K Rend Acrylic TC finish Figure 8 Additional reinforcement at openings A 300 mm by 200 mm Render finish 6 14 The basecoat should be left to dry thoroughly before the application of K Rend Acrylic TC Depending on the prevailing conditions the render may take three days to dry cure completely prior to the application of the primer finish 6 15 The primer is applied to the basecoat in accordance with the Certificate holder s instructions and allowed to dry for approximately 24 hours prior to the application of the K Rend Acrylic TC finishing coat 6 16 The finishing coat should be applied in accordance with the Certificate holder s instructions 6 17 Care should be should be taken in the detailing of the system around features such as openings projectio
3. Page 1 of 16 Regulations In the opinion of the BBA the K Rend External Wall Insulation System 1 if installed used and maintained in accordance with this Certificate will meet or contribute to meeting the relevant requirements of the following Building Regulations the presence of a UK map indicates that the subject is related to the Building Regulations in the region or regions of the UK depicted 42 The Building Regulations 2010 England and Wales as amended 5 Requirement Al Loading Comment The system can sustain and transmit wind loads to the substrate wall See section 7 4 of this Certificate Requirement B4 1 External fire spread Comment The system is classified B2 s1 dO and therefore meets this Requirement See sections 8 1 to 8 5 of this Certificate Requirement C2 b Resistance to moisture Comment The system provides a degree of protection against rain ingress See sections 4 5 and 10 1 of this Certificate Requirement C2 c Resistance to moisture Comment The system contributes to minimising the risk of interstitial and surface condensation See sections 11 1 11 2 and 11 4 of this Certificate Requirement L1 a i Conservation of fuel and power Comment The system will contribute to meeting the U value requirement See sections 6 1 to 6 3 of this Certificate Regulation 7 Materials and workmanship Comment The system is acceptable See sections 13 1 and the Installation part of this Certi
4. 1 The insulation is delivered to site shrink wrapped in polythene packs bearing the manufacturer s and product identification marks and batch numbers Page 4 of 16 3 2 Components are delivered in the manufacturer s and product identificati incorporating the number of this Certifi quantities and packages listed in Table 1 Each package carries the on and batch number The basecoat and render also include the BBA logo cate Table 1 Component supply details Component Quantity and packaging Enhanced shrunkwrapped in individual packs number of boards Polystyrene EPS 70E varies depending on thickness Fixings boxed by the manufacturer K Rend HP14 Base 25 kg bag Glassfibre mesh 1 mx 50 m coll K Rend Primer TC 15 kg tub K Rend Acrylic TC 25 kg tub 3 3 The insulation boards should be stored on a firm clean level base off the ground and must be protected from prolonged exposure to sunlight either by storing opened packs under cover in dry conditions or recovering with opaque polythene sheeting 3 4 Care must be taken when handling the insulation boards to avoid both damage and contact with solvents or bitumen products The boards must not be exposed to open flame or other ignition sources Boards that become damaged soiled or wet should be discarded 3 5 The powder components should be stored in dry conditions off the ground and protected from frost at all times Tubs of unopened render will have a shelflife of 12 mont
5. 8 D dl li e D D B e EK L S Pattern 1 5 x 60 mm head fixings Pattern 2 4 x 140 mm head fixings Pattern 3 5 x 60 mm head fixings 6 6 The boards are always laid in brick bond fashion see Figure 5 Care is taken to ensure that the boards are itted tight to each other The boards are interlocked on the external corners Gaps are filled with expanding PUR foam The line and level are checked as work progresses 6 7 The first run of insulation boards is positioned on the base profile 6 8 The fixings are installed by drilling through the insulation and into the substrate Care is taken to ensure that the depth of embedment of the fixing into the substrate is as specified Allowance is made where either existing render is on the wall or dubbing out render has been used to align the boards as the effective embedment will be reduced The fixings are either hammered or screwed in depending on the type specified 6 9 To fit around details such as doors and windows insulation boards may be cut with a sharp knife or a fine toothed saw If required purpose made window sills are fitted at this stage They are designed to prevent water ingress and incorporate drips to shed water clear of the system see Figure 6 Page 12 of 16 Figure 6 Details around openings
6. have adequate resistance to wind loads and impact damage see section 7 Behaviour in relation to fire the enhanced expanded polystyrene is combustible but the render finish has a classification of B2 s1 dO external surface rating see section 8 Durability when installed and maintained in accordance with the Certificate holder s recommendations and the terms of this Certificate the system will have a life of at least 30 years see section 13 The BBA has awarded this Certificate to the company named above for the system described herein This m has been assessed by the BBA as being fit for its intended use provided it is installed used and maintained as set out in this Certificate On behalf of the British Board of Agr ment axes A RAA ee ee pum Date of First issue 10 January 2014 John Albon Head of Approvals Claire Curtis Thomas Energy and Ventilation Chief Executive The BBA is a UKAS accredited certification body Number 113 The schedule of the current scope of accreditation for product certification is available in pdf format via the UKAS link on the BBA website at www bbacerts co uk Readers are advised to check the validity and latest issue number of this Agr ment Certificate by either referring to the BBA website or contacting the BBA direct British Board of Agr ment tel 01923 665300 Bucknalls Lane fax 01923 665301 Watford email mail bba star co uk Herts WWD25 9BA website www bbacerts co uk
7. the client CDM co ordinator designer and contractors to address their obligations under these Regulations See section 3 Delivery and site handling 3 2 of this Certificate Additional Information NHBC Standards 2014 NHBC accepts the use of the K Rend External Wall Insulation System 1 provided it is installed used and maintained in accordance with this Certificate in relation to NHBC Standards Part 6 Superstructure and Chapter 6 9 Curtain walling and cladding Technical Specification 1 Description 1 1 The K Rend External Wall Insulation System 1 comprises enhanced expanded polystyrene EPS insulation boards mechanically fixed directly to the substrate wall with a mesh reinforced high polymer content basecoat and a 1 5 mm or 3 0 mm acrylic render finish 1 2 The system see Figure 1 comprises Insulation e Enhanced Polystyrene EPS ZOE enhanced expanded polystyrene insulation board 1200 mm by 600 mm in a range of thicknesses between 40 mm and 200 mm in 10 mm increments with a nominal density of 17 kgm and a minimum compressive strength of ZO kN m 2 Boards are manufactured to comply with the requirements of EPS 70 Class E flame retardant material to BS EN 13163 2008 Mechanical fixings e mechanical fixings proprietary external wall insulation fixings of adequate length to suit the substrate and insulation thickness with a minimum 60 mm washer diameter and minimum plate stiffness of 0 6 kKN mm a
8. 05 and its UK National Annex and BS EN 998 2 2010 on the minimum thickness of render required for the different exposure categories 10 4 The guidance given in BRE Report BR 262 2002 should be followed in connection with the weathertightness of solid wall constructions The designer should select a construction appropriate to the local wind driven rain index paying due regard to the design detailing workmanship and materials to be used 10 5 At the tops of walls the system should be protected by an adequate overhang or other detail designed for use with this type of system 11 Risk of condensation F gM construction including at junctions openings and penetrations to minimise the risk of condensation The b 1 1 Designers must ensure that an appropriate condensation risk analysis has been carried out for all parts of recommendation of BS 5250 2011 should be followed Page 9 of 16 Surface condensation 47 11 2 Walls will limit the risk of surface condensation adequately when the thermal transmittance U value does not exceed 0 7 W m K at any point and the junctions with other elements are designed in accordance with the relevant requirements of the publications referred to in section 4 of this Certificate Zp Snot exceed 1 2 W K at any point Guidance may be obtained from BS 5250 2011 Section 4 and Annex G and BRE Report BR 262 2002 Interstitial condensation a 1 3 Walls will adequately li
9. 36 to 4 40 8 6 In multi storey applications at least one 8 mm diameter stainless steel fixing in addition to those of plastics per square metre of insulation is required The anchor is applied to prevent collapse should the insulation be lost to fire and must be designed to resist the bending and shear stresses resulting from the dead load from the render 9 Proximity of flues and appliances When the system is installed in close proximity to certain flue pipes the relevant provisions of the national Building Regulations should be met England and Wales Approved Document J Scotland Mandatory Standard 3 19 clause 3 19 4012 1 Technical Handbook Domestic 2 Technical Handbook Non Domestic Northern Ireland Technical Booklet L 10 Rain penetration ensure that substrate walls are adequately weathertight prior to its application The insulation system shall only be installed where there are no signs of dampness on the inner surface of the substrate other than those caused solely by condensation 4 10 1 The system will provide a degree of protection against rain ingress However care should be taken to 10 2 Designers and installers should take particular care in detailing around openings penetrations and movement joints to minimise the risk of rain ingress only details approved by the Certificate holder should be used f 10 3 For externally insulated single leaf masonry walls guidance is given in BS EN 1996 1 1 20
10. 5 N AU to BS EN 10327 2004 with a polyester powder paint finish to BS EN 13438 2005 Aluminium or rigid PVC profiles are also available Profiles are provided to the specitier s requirements and approved by the Certificate holder profile fixings glass einforced plastic GRP plated or stainless steel screws or driven pins with plastic expansion sleeves sealant silicone as approved by the Certificate holder 1 4 The boards are attached to the substrate with a minimum of four or five mechanical fixings per board see section 16 5 and Figure 5 1 5 The K Rend HP14 Base render is applied in two layers with the mesh in between to give a finished coat of at least 6 mm thick see Figure 1 2 Manufacture As part of the assessment and ongoing surveillance of the quality of the system components the BBA has agreed with the manufacturer the quality control procedures and product testing to be undertaken assessed and agreed the quality control operated over batches of incoming materials monitored the production process and verified that it is in accordance with the documented process evaluated the process for management of nonconformities checked that equipment has been properly tested and calibrated undertaken to carry out the above measures on a regular basis through a surveillance process to verify that the specifications and quality control operated by the manufacturer are being maintained 3 Delivery and site handling 3
11. A at the date of issue or reissue of this Certificate 19 3 This Certificate will remain valid for an unlimited period provided that the product system and its manufacture and or fabrication including all related and relevant parts and processes thereof e are maintained at or above the levels which have been assessed and found to be satisfactory by the BBA e continue to be checked as and when deemed appropriate by the BBA under arrangements that it will determine e are reviewed by the BBA as and when it considers appropriate 19 4 The BBA has used due skill care and diligence in preparing this Certificate but no warranty is provided 19 5 In issuing this Certificate the BBA is not responsible and is excluded from any liability to any company firm organisation or person for any matters arising directly or indirectly from e the presence or absence of any patent intellectual property or similar rights subsisting in the product system or any other product system e the right of the Certificate holder to manufacture supply install maintain or market the product system e actual installations of the product system including their nature design methods performance workmanship and maintenance e any works and constructions in which the product system is installed including their nature design methods performance workmanship and maintenance e any loss or damage including personal injury howsoever caused by the product system incl
12. A_N APPROVAL Kilwaughter Chemical Co Lid BBA i CERTIFICATION 9 Starbog Road TECHNICAL APPROVALS FOR CONSTRUCTION Larne a aA Fax 028 28260136 Agrement a el ax email sales kilwaughter com 13 5080 website www kilwaughter com Product Sheet 1 K REND EXTERNAL WALL INSULATION SYSTEMS K REND EXTERNAL WALL INSULATION SYSTEM 1 This Agr ment Certificate Product Sheet relates to the K Rend External Wall Insulation System 1 comprising mechanicallyfixed enhanced expanded polystyrene EPS boards with a mesh reinforced basecoat render The system is for application to the outside of external walls of masonry or dense concrete construction in new or existing domestic and non domestic buildings up to 18 m in height 1 Hereinafter referred to as Certificate CERTIFICATION INCLUDES e factors relating to compliance with Building Regulations where applicable e factors relating to additional non regulatory information where applicable independently veritied technical specification assessment criteria and technical investigations design considerations installation guidance regular surveillance of production formal three yearly review KEY FACTORS ASSESSED Thermal performance the system can be used to improve the thermal performance of external walls and contribute to meet the requirements of the Building Regulations see section 6 Strength and stability a correctly designed system will
13. N 13914 1 2005 Design preparation and application of external rendering and internal plastering External rendering BS EN ISO 6946 2007 Building components and building elements Thermal resistance and thermal transmittance Calculation method BRE Report BR 135 2013 Fire Performance of External Insulation for Walls of Multi storey Buildings BRE Report BR 262 2002 Thermal insulation avoiding risks ETAG 004 2011 Guideline for European Technical Approval of External Thermal Insulation Composite Systems with Rendering ETAG 014 2002 Guideline for European Technical Approval of Plastic Anchors for fixing of External Thermal Insulation Composite Systems with Rendering Page 15 of 16 Conditions of Certification 19 Conditions 19 1 This Certificate e relates only to the product system that is named and described on the front page e is issued only to the company firm organisation or person named on the front page no other company firm organisation or person may hold or claim that this Certificate has been issued to them e is valid only within the UK e has to be read considered and used as a whole document it may be misleading and will be incomplete to be selective e is copyright of the BBA e is subject to English Law 19 2 Publications documents specifications legislation regulations standards and the like referenced in this Certificate are those that were current and or deemed relevant by the BB
14. dance with the guidance given in values and multiplying by 0 6 ixings The characteristic pull out resistance should be determined in ETAG 014 2002 Annex D ie by calculating the mean of the lowest five 7 6 The number and centres of fixings should be determined by the system designer Provided the substrate wall is suitable and an appropriate fixing is selected the mechanical fixings will adequately support and transfer the weight of the render insulation system to the substrate wall at the minimum spacing given in this Certificate 7 7 Typical characteristic pull out strengths for the fixings taken from the corresponding European Technical Approval ETA are given in Table 3 however these values are dependent on the substrate and the fixing must be selected to suit the loads and substrate concerned Page 7 of 16 Table 3 Fixings typical characteristic pull out strengths Fixing type Typical pull out strength N Polyethylene with metal centre pin Ejotherm NT U 1200 Polyethylene with metal centre screw Ejotherm STR U 1500 1 Values are determined in accordance with ETAG 014 2002 and are dependent on the substrate 7 8 The resistance forces data are given in Table 4 and are the results of calculations based upon e fixings arranged in the pattern described and shown in section 16 5 and Figure 5 e characteristic pullthrough resistances determined by the BBA from tests on anchors with 60 mm diameter plate
15. er resistance multiplied by the number of fixings based upon the limiting resistance Impact resistance 7 9 Hard body impact tests were carried out in accordance with ETAG 004 2011 The system is suitable for use in use category IIU 1 The use categories are defined in ETAG 004 as e Use category a zone readily accessible at ground level to the public and vulnerable to hard body impacts but not subjected to abnormally rough use e Use category Il a zone liable to impacts from thrown or kicked objects but in public locations where the height of the system will limit the size of the impact or at lower levels where access to the building is primarily to those with some incentive to exercise care e Use category Ill a zone not likely to be damaged by normal impacts caused by people or by thrown or kicked objects 8 Behaviour in relation to fire 4 The overall classification for the complete system in accordance with BS EN 13501 1 2007 is B2 s1 dO 5 8 3 The enhanced EPS insulation material in isolation is classified as combustible 8 2 These ratings apply to the full range of colours covered by this Certificate 8 4 Requirements under the various national Building Regulations are England Wales and Northern Ireland e The system is considered suitable for use on or at any distance from the boundary provided the wall meets the fire resistance requirements in Tables Al and A2 e The system is restricted f
16. eratures below 5 C or above 30 C if exposure to frost is likely or in damp wet conditions The render must be protected from rapid drying and should not be applied on elevations in direct sunlight 6 3 All rendering should be in accordance with the relevant recommendations of BS EN 13914 1 2005 Positioning and securing insulation boards 6 4 The base profile is secured to the external wall above the dpc using approved profile fixings at 300 mm maximum centres see Figure 4 Beads and expansion joints are incorporated as specified Page 11 of 16 Figure 4 Typical section at base level profile fixing base profile existing buildi ng profile fixing base profile dpc ground floor edge insulation outside scope of Certificate C3 SSS 0e ere g O O 0 2 SOO GO F Er new building J V O Q Figure 5 Typical fixing pattern 16 5 The insulation boards are securely fixed to the substrate starting at the base profile level using the project specific ixing type and layout as shown in the project specification and drawings see Figure 5 a ele e B ele e D amp D D
17. ficate Regulation 26 CO emission rates for new buildings Comment The system will contribute fo a building meeting its target emission rate See sections 6 1 to 6 3 of this Certificate 5 r The Building Scotland Regulations 2004 as amended Regulation 8 1 2 Fitness and durability of materials and workmanship Comment The use of the system satisfies the requirements of this Regulation See sections 12 1 and 13 1 and the Installation part of this Certificate Regulation 9 Building standards applicable to construction Standard Wel Structure Comment The system can sustain and transmit wind loads to the substrate wall with reference to clauses 1 1 1012 and 1 1 2021 See section 7 4 of this Certificate Standard 2 6 Spread to neighbouring buildings Comment The system has a surface spread oHlame classification of B2 s1 dO and therefore can meet this Standard with reference to clauses 2 6 4012 2 6 5 and 2 6 6 2 See sections 8 1 to 8 5 of this Certificate Standard Delf Spread on external walls Comment The system incorporates materials which would not be classified as non combustible as defined in this Standard with reference to clause 2 7 1012 2 7 2123 and Annex 2A See sections 8 1 to 8 5 of this Certificate Standard 3 10 Precipitation Comment Walls insulated with the system will contribute to a construction satisfying this Standard with reference to clauses 3 10 12 and 3 10 6021 See sect
18. gn BS EN 1991 1 4 2005 Eurocode 1 Actions on structures General actions Wind actions NA to BS EN 199 1 1 4 2005 UK National Annex to Eurocode 1 Actions on structures General actions Wind actions BS EN 1996 1 1 2005 Eurocode 6 Design of masonry structures General rules for reinforced and unreinforced masonry structures NA to BS EN 1996 1 1 2005 UK National Annex to Eurocode 6 Design of masonry structures General rules for reinforced and unreinforced masonry structures BS EN 1996 2 2006 Eurocode 6 Design of masonry structures Design considerations selection of materials and execution of masonry NA to BS EN 1996 2 2006 UK National Annex to Eurocode 6 Design of masonry structures Design considerations selection of materials and execution of masonry BS EN 10088 1 2005 Stainless steels List of stainless steels BS EN 10327 2004 Continuously hotdip coated strip and sheet of low carbon steels for cold forming Technical delivery conditions BS EN 13163 2008 Thermal insulation products for buildings Factory made products of expanded polystyrene EPS Specification BS EN 13438 2005 Paints and varnishes Powder organic coatings for galvanized or sherardised steel products for construction purposes BS EN 13501 1 2007 Fire classification of construction products and building elements Classification using test data from reaction to fire tests BS E
19. hs when stored correctly Assessment and Technical Investigations The following is a summary of the assessment and technical investigations carried out on the K Rend External Wall Insulation System 1 4 General 4 The K Rend External Wall Insulati for use as external wall insulation and on System 1 when installed in accordance with this Certificate is satisfactory is effective in reducing the thermal transmittance U value of the walls of new and existing buildings of up to 18 m in height It is essential that the detailing techniques specified in this Certificate are carried out to a high standard if th e ingress of water into the insulation is to be avoided and the full thermal benefit obtained from the system Only details approved by the Certificate holder must be used 4 2 The system is applied to the outsi de of external walls of masonry and dense or nofines concrete construction and is suitable tor use on new or existing domestic or non domestic buildings Application and maintenance must be carried out strictly in accordance with this Cer by the Certificate holder tificate and the Certificate holder s instructions by installers trained and approved 4 3 The system can improve the weather resistance of a wall and provide a decorative finish However it may be installed only where the substrate is inherently waterproof in i s own right and where other potential sources of moisture penetrati
20. icate holder or their approved applicators see section 15 to determine the adequacy of the substrate Trial tests are conducted on the wall to determine the pull out resistance of the proposed mechanical fixings An assessment and recommendation is made on the type and number of fixings required to withstand the building s expected wind loading based on calculations using the test data the relevant wind speed data for the site and in the absence of a formal requirement a safety factor of 2 is applied see Table 4 4 3 Itis recommended that external plumbing should be removed before installation and alterations made to underground drainage where appropriate to accommodate repositioning of the plumbing on the finished face of the system Page 10 of 16 14 4 New buildings should be of sound masonry dense or nofines concrete construction 14 5 Surfaces should be sound clean and free from loose material The flatness of surfaces must be checked this may be achieved using a straightedge spanning the storey height Any excessive irregularities ie greater than 10 mm in 1 m must be made good prior to installation to ensure that the insulation boards are installed with a smooth in plane finished surface 4 6 On existing buildings purpose made window sills must be fitted to extend beyond the finished face of the system see Figure 6 New buildings should incorporate suitably deep sills 4 7 Where surfaces are covered with an exist
21. ing render it is essential that the bond between the background and he render is adequate All loose areas should be hacked off and reinstated 4 4 8 Internal wet work eg screeding or plastering should be completed and allowed to dry prior to the application of a system 4 9 All modifications such as provision for cavity barriers and fire stopping see section 8 and necessary repairs to the building are completed before installation commences 15 Approved installers Application of the system within the context of this Certificate is carried out by approved installers recommended or recognised by the Certificate holder Such an installer is a company t e employing operatives who have been trained and approved by the Certificate holder to install the system 4 e which has undertaken to comply with the Certificate holder s application procedure containing the requirement for each application team to include at least one member operative trained by the Certificate holder e subject to at least one inspection per annum by the Certificate holder to ensure suitable site practices are being employed This may include unannounced site inspections 16 Procedure General 6 1 Installation is carried out in accordance with the current installation instructions of the Certificate holder 6 2 Weather conditions should be monitored to ensure correct application and curing conditions The render should not be applied at temp
22. ions 4 5 and 10 3 of this Certificate Standard BS Condensation Comment Walls insulated with the system will satisfy the requirements of this Standard with reference to clauses 3 15 12 3 15 42 and 3 15 5 2 See sections 11 3 and 11 4 of this Certificate Standard 6 1 b Carbon dioxide emissions Standard ow Buildings insulation envelope Comment Walls insulated with the system can contribute to satistying these Standards with reference to clauses MO o TA aUa 1 A 1M 1 82 O11 108 O21 2 20 Siile 6 2 4012 6 2 512 6 2 6023 6 2 7123 6 2 11 and 6 2 13 2 of these Standards See section 6 of this Certificate Standard 7 1 a b Statement of sustainability Comment The product can contribute to meeting the relevant requirements of Regulation 9 Standards 1 to 6 and therefore will contribute to a construction meeting a bronze level of sustainability as defined in this Standard In addition the product can contribute to a construction meeting a higher level of sustainability as defined in this Standard with reference to clauses 7 1 402 Aspects 1012 and 20 7 1 6012 Aspects 102 and 20 and 7 1 702 Aspect 11121 See section 6 of this Certificate Regulation 12 Building standards applicable to conversions Comment All comments given for these systems under Regulation 9 Standards 1 to 6 also apply to this Regulation with reference to clause O 12 1 2 and Schedule 60123 1 Technical Handbo
23. lockwork X 1 75 W mrl K1 vy 100 and 6 7 e mortar 0 88 W m K e plaster 13 mm 0 57 W m K p 10 e internal boundary resistance R 0 13 m 2 K W7 6 3 The system can maintain or contribute to maintaining continuity of thermal insulation see Figure 2 Care must be taken fo ensure an appropriate thickness of insulation is used particularly at points such as junctions between floors and walls and at window and door reveals to avoid thermal bridging and reduce the risk of condensation forming at these points Items such as windows and doors should be selected taking into account the thickness of insulation required at the reveals to help prevent condensation forming at these junctions Detailed guidance for junctions and on limiting heat loss by air infiltration can be found in England and Wales Approved Documents to Part L and for new thermal elements to existing buildings Accredited Construction Details version 1 0 For new build see also SAP 2009 Appendix K and the iSBEM User Manual Scotland Accredited Construction Details Scotland Northern Ireland Accredited Construction Details version 1 0 Page 6 of 16 Figure 2 Ju nction details 7 Strength and stability 7 The system can adequately transfer to the wall the self weight and negative and positive suction and pressure loads normally experienced in the United Kingdom 7 2 Positive wind load p
24. mit the risk of surface condensation when the thermal transmittance U value does J designed and constructed in accordance with BS 5250 2011 Section 4 and Annexes D and G 11 5 The system has a water vapour resistance such that under the conditions likely to occur in a dwelling in the United Kingdom interstitial condensation should not occur within the insulation 4 1 4 Walls incorporating the system will adequately limit the risk of interstitial condensation when they are 11 6 If the system is to be used on the external walls of rooms expected to have continuous high humidities care must be taken in the design of the rooms to avoid possible problems from the formation of interstitial condensation 11 7 The water vapour resistivity of the EPS boards can be taken as between 100 MN s g7 m and 200 MN s g7 m 12 Maintenance and repair 12 1 Regular checks should be made on the installed insulation system particularly at joints with other elements to ensure that ingress of water does not occur Checks should verify that architectural details for shedding water clear of the building are present and functioning and that external plumbing fitments are in good condition Maintenance schedules should include the replacement and resealing of joints for example between the insulation system and window and door frames The interval between inspections should be considered for each building taking into account such factors as the building l
25. ns and at eaves see Figure 6 to ensure adequate protection against water ingress and to limit the risk of water penetrating the system 6 18 On completion external fittings are refixed to the substrate using suitable fixing pads previously installed in the systems 6 19 On completion external fittings eg rainwater goods are refixed through the system into the substrate Page 14 of 16 17 Tests An examination was made of data relating to e resistance to freeze thaw e heat spray cycling e impact resistance e component characterisation e water vapour permeability e fire performance e durability of finish e pullout strength of fixings e thermal conductivity 18 Investigations 18 1 The manufacturing process the methods adopted for quality control of manufactured and boughtin components and details of the quality and composition of the materials used were examined 18 2 An assessment of the risk of interstitial condensation was undertaken 18 3 The practicability of installation and the effectiveness of detailing techniques were examined Bibliography BS 5250 2011 Code of practice for control of condensation in buildings BS 8000 3 2001 Workmanship on building sites Code of practice for masonry BS EN 998 2 2010 Specification for mortar for masonry Masonry mortar BS EN 1990 2002 Eurocode Basis of structural design NA to BS EN 1990 2002 UK National Annex to Eurocode Basis of structural desi
26. ocation and height 12 2 Damaged areas must be repaired using the appropriate components and the procedures detailed in the Certificate holder s installation instructions 13 Durability 13 1 The system will remain effective for at least 30 years provided any damage to the surface finish is 53m epaired immediately and regular maintenance is undertaken as described in Section 12 13 2 The render may become discoloured with time the rate depending on the initial colour the degree of exposure and atmospheric pollution as well as the design and detailing of the wall In common with traditional renders discoloration by algae and lichens may occur in wet areas The appearance may be restored by a suitable power wash or if required by over coating 14 Site survey and preliminary work 14 1 A pre installation survey of the property is carried out to determine suitability for treatment and the need for any necessary repairs to the building structure before application of the K Rend External Wall Insulation System 1 A specification is prepared for the building indicating e the position of beads e detailing around windows doors and at eaves e damp proof course dpc level e exact position of expansion joints e areas where flexible sealants must be used e any alterations to external plumbing e where required the position of fire barriers 4 2 The survey should include tests conducted on the walls of the building by the Certif
27. ok Domestic 2 Technical Handbook Non Domestic Page 2 of 16 The Building Regulations Northern Ireland 2012 5 Regulation 23 Fitness of materials and workmanship Comment The system is acceptable See section 13 1 and the Installation part of this Certificate Regulation 28 Resistance to moisture and weather Comment Walls insulated with the system will satisfy this Regulation See sections 4 5 and 10 1 of this Certificate Regulation 29 Condensation Comment Walls insulated with the systems will satisfy the requirements of this Regulation See sections 4 8 11 2 11 4 an 11 5 of this Certificate Regulation 30 Stability Comment The system can sustain and transmit wind loads to the substrate wall See sections 7 4 of this Certificate Regulation 36 a External fire spread Comment The system has a Class B2 s1 dO surface and can satisfy this Regulation See sections 8 1 to 8 5 of this Certificate Regulation 39 a i Conservation measures Comment The system can contribute to enabling a wall to meet this Regulation See section 6 of this Certificate Regulation 40 Target carbon dioxide emission rate Comment The system will contribute to a building satisfying its target emission rate See section 6 of this Certificate Construction Design and Management Regulations 2007 Construction Design and Management Regulations Northern Ireland 2007 Information in this Certificate may assist
28. on have been dealt with separately and where there are no signs of dampness on the inner surface of the wall other than those caused solely by condensation The system can be used to overcome internal condensation 4 4 Existing buildings subject to natio Site survey and preliminary work of thi relevant recommendations of 5 o BS EN 1998 2 200orana iis UK nal Building Regulations should have wall surfaces in accordance with section 14 s Certificate New buildings subject to national Building Regulations should be constructed in accordance with the National Annex the designer should select a construction appropriate to the local wind driven rain index paying due regard to the design detailing workmanship and materials to be used O BS 6000 3 2001 4 6 Other new buildings not subject Standards listed in section 4 5 to any of the previous requirements should also be built in accordance with the 4 7 The effect of the installation of the system on the acoustic performance of a construction is outside the scope of this Certificate 4 8 The fixing of rainwater goods satellite dishes clothes lines hanging baskets and similar items is outside the scope of this Certificate 4 9 It is essential that the system is installed and maintained in accordance with the conditions set out in this Certificate Page 5 of 16 5 Practicability of installation The system should be installed only by specialised cont
29. or use in buildings less than 18 m in height Scotland e The system must not be used within 1 m of the boundary and is restricted for use in buildings less than 18 m in height e The system is not classified as non combustible therefore must be regarded as unprotected areas unless it is attached to the structure of the building and the external wall does not contain openings other than the small openings described in Mandatory Standard 2 6 2 clause 2 6 2b and the wall behind the cladding has the appropriate fire resistance duration from the inside see Annex 2 A and 2 D of the Domestic and Non Domestic Technical Handbooks respectively Page 8 of 16 Figure 3 Cavity barrier 2nd floor inside cavity barrier Ist floor insulation 8 5 The insulation system covered by this Certificate does not incorporate cavities between the insulation and the substrate however fire barriers should be incorporated into a construction where required by the relevant Building Regulations to maintain the continuity of fire resistance Further details are given in BRE Report BR 135 2013 and in England and Wales Approved Document B Volume 1 Section 6 and Volume 2 Section 9 Scotland Mandatory Standard 2 4 clauses 2 4 1 l2 2 4 2023 2 4 70 and 2 4 91 1 Technical Handbook Domestic 2 Technical Handbook Non Domestic Northern Ireland Technical Booklet E Section 3 paragraphs 4
30. pproved and supplied by the Certificate holder examples include Ejotherm NT U polyethylene with metal centre pin Ejotherm STR U polyethylene with metal centre screw 1 The Ejot SBL 140 a proprietary 140 mm diameter polyamide extension washer can be used in conjunction with the above anchors to enhance the pullthrough capacity Basecoat e K Rend HP14 Base a cement based high polymer modified basecoat It is supplied as a powder to which only potable water is added in the correct proportion and applied to a thickness of 6 mm or greater Reinforcement e reinforcing mesh an alkali resistant glassfibre mesh in 50 m by 1 m rolls with a grid pattern of 4 mm by 4 mm and nominal weight of 160 g m Primer e K Rend Primer TC available in a range of colours to suit the colour of finish selected Page 3 of 16 Finishing coat K Rend Acrylic TC a decorative topcoat in 15 and 30 grades and in a range of colours Figure 1 K Rend External Wall Insulation System 1 glassfibre mesh within existing solid wall isting soli two layers of basecoat mechanical fixing finish coat 1 3 Ancillary materials outside the scope of this Certificate include profiles a range of standard profiles for such details as wall bases end stops corner meshes and expansion joints produced in either stainless steel number 1 4301 to BS EN 10088 1 2005 or galvanized steel strip DX51D Z27
31. ractors who have successfully undergone training and registration by the Certificate holder Note The BBA operates a UKAS Accredited Approved Installer Scheme for external wall insulation details of installer companies approved are included on the BBA s website www bbacerts co uk 6 Thermal performance 6 1 Calculations of the thermal transmittance U value should be carried out in accordance with BS EN ISO 6946 2007 and BRE Report BR 443 2006 Conventions for U value calculations using the declared thermal conductivity Xp value of 0 032 W mr K 6 2 The U value of a completed wall will depend on the thickness of the insulation used the number and type of fixings the insulating value of the substrate masonry and its internal finish Example U values of walls incorporating the system are given in Table 2 and are based on five fixings per board 6 9 per m Table 2 Insulation thickness required to achieve some typical design values U value Insulation thickness requirement mm amr Kol ene Brickwork Dense blockwork A 0 56 Wm K A 1 75 W m K 0 19 160 170 0 26 110 120 0 28 100 110 0 30 100 100 0 35 80 85 1 The following values for other elements of the construction were used e external boundary resistance R 0 04 m K W e render 14 mm sand and cement 1 0 W m K p 6 wel e EPS ZOE 215 mm 93 3 e brickwork protected 0 56 W m 1 K 1 p 10 or 200 mm b
32. ressure is transferred to the substrate wall directly via bearing and compression of the render and insulation 7 3 Negative wind pressure suction is resisted by the bond between each component The insulation boards are retained by the external wall insulation system anchors 7 4 The wind loads on the wall should be calculated in accordance with BS EN 1991 1 4 2005 and its UK ome Annex Special considerati additional fixings may be necessary on should be given to locations with high wind load pressure coefficients as In accordance with BS EN 1990 2002 and its UK National Annex it is recommended that a load factor of 1 5 is used to determine the ultimate wind load to be resisted by the system 7 5 Assessment of structural performance experienced person to confirm that e the substrate wall has adequate strength system ignoring any contributi e the proposed system and associated fixi or individual buildings must be carried out by a suitably qualified and to resist additional loads that may be applied as a result of installing the on from the insulation system ng layout provides adequate resistance to negative wind loads based on the results of the site investigation and test results given in Table 3 see also section 7 8 e an appropriate number of site specific p ul out tests must be conducted on the substrate of the building to determine the minimum resistance to failure of the accor
33. s Table 4 Example calculation sheet to establish ultimate wind load capacity Factor unit Insulation value Plate diameter of anchor mm 60 140 Thickness mm 60 60 Insulation tensile resistance kPa 196 196 Fixings types See Table 3 See Table 3 Characteristic pull through resistance per anchor N 475 1090 Factor of safety 2 5 25 Design pullthrough resistance N 190 5 436 Characteristic anchor pull out resistance per anchor N 1200 1200 Factor of safety 2 2 Design pull out resistance per anchor N 600 600 Limiting design value per fixing N 190 5 436 Limiting design value per slab with five fixings N 950 2180 Area of slab m 0 72 0 72 Limiting pressure kN m 1 33 3 02 1 Calculation based on a 1200 mm by 600 mm total area 0 72 m insulation slab attached by five fixings 2 Characteristic pullthrough resistance of insulation over the head of the fixing in accordance with BS EN 1990 2002 Annex D7 2 3 The safety factor of 2 5 is applied and based on the assumption that all insulation slabs are quality control tested to establish tensile strength perpendicular to the face of the slab 4 See section 7 5 third bullet point 5 In accordance with this guideline a safety factor of two is applied to this figure to establish the design value to resist ultimate loads 6 The lesser of the slab design pullthrough resistance and the anchor design pullout resistance 7 Slab design pull ov
34. uding its manufacture supply installation use maintenance and removal e any claims by the manufacturer relating to CE marking 19 6 Any information relating to the manufacture supply installation use maintenance and removal of this product system which is contained or referred to in this Certificate is the minimum required to be met when the product system is manufactured supplied installed used maintained and removed It does not purport in any way to restate the requirements of the Health and Safety at Work etc Act 1974 or of any other statutory common law or other duty which may exist at the date of issue or reissue of this Certificate nor is conformity with such information to be taken as satistying the requirements of the 1974 Act or of any statutory common law or other duty of care British Board of Agr ment tel 01923 665300 Bucknalls Lane fax 01923 665301 Watford email mail bba star co uk Herts WD25 BA website www bbacerts co uk Page 16 of 16
Download Pdf Manuals
Related Search