Survey & Installation Manual - Bereco Timber Windows and Doors
Contents
1. points Left Middle rau Right The smallest dimension should i 5 be used to determine the Figure 1 height See Figure 1 Diagonal Measurement If the diagonals differ the window size should be reduced accordingly so that when the new frame is offered up to the aperture it can be installed square normally with the aid of packers in the appropriate places If the diagonals vary by more than 10mm additional outer trims may be required to conceal the gaps between the frame and aperture The customer should be advised of this and agree to it prior to order confirmation Cill Extensions The distance from the face of the building to the front face of the cill extension should be no less than 25mm The distance of the internal face of the frame should be at least 30mm into the cavity to comply with Part L of Building Regulations All Dimensions need to be taken in the place where the windows will sit once installed Figure 2 Structural Opening Size Overall Frame Size Bereco Delivering the Difference ize ize Daylight Si Structural Opening Si Ove2. Weather Board _ gt lt S 1 4 3 Flush amp French Doors Reveal with or without use of Cavity Closure Measuring doors with a reveal wall detail is similar to measuring windows with a reveal the same information is required That means the overall dimension from brick to brick is required as well as the size of reveal When Cavity Closures are used there is again no measure required since the Closure acts like a Former and window sizes are determined with the Closure The reveal sizes and the Cavity width are necessary to order Cavity Closures It is very important regardless of the use of Cavity Closures that the maximum cover for doorframes is not exceeded Table 3 gives advice on the maximum cover for doors That is the overall cover including reveal and final wall finish Table 3 Maximum Reveal Cover Flush Flush French French Sliding Tilt amp Folding Door Door Door Door Patio Slide Sliding open open open open Doors Doors Doors in out in out HS PSK FS Max Omm Jambs 45mm 20mm 60mm packer 50mm 60mm 60mm Cover rqd Max Omm Omm Head 45mm packer 60mm packer 50mm 60mm 72mm Cover rqd rqd 1 reduced to 15mm when vent is provided Should the required cover exceed the recommendations there is a chance to order additional timber packer to allow for a tight and correct fit Bereco Delivering the Difference 1 4 4 Manufacturing Size Flush amp French Doors Reveal with or without Cavity Closu
3. www sbsa gov uk for Northern Ireland Department for Finance amp Personnel www communities gov uk Windows and Doors are non load bearing elements and structural support like lintels are necessary 1 2 Measuring Windows in new build situations 1 2 1 Flat Windows no reveal with or without Cavity Closures The way to measure flat windows is exactly the same regardless of the use of pre formed Cavity Closures but these Formers are required during construction and therefore assure correct building In this case no measurements of the final opening need to be taken Formers determine the structural opening size and therefore the window size which guarantees a perfect fit Cavity Closures can be made to agreed structural sizes Bereco simply deducts a tolerance to achieve a window size Width Measurement The width of the aperture should be measured at three points Top TN Middle _ Bottom a The smallest dimension should be Figure 1 used to determine the width See Figure 1 Sa Bereco DELIVERING THE DIFFERENCE Height Measurement The height of the aperture should be measured at three NI
4. 2 Option 3 Flush Door open in 30mm 30mm Omm Flush Door open out 35mm 35mm Omm French Door open in 30mm 30mm Omm French Door open out 35mm 35mm Omm Sliding Door HS 40mm N A N A Tilt amp Slide Door PSK Omm N A N A Folding Sliding Door FS See figure 14 1 4 2 Manufacturing Size Entrance amp French Doors no reveal with or without Cavity Closures As with the windows fitting tolerances need to be deducted when structural openings are measured in order to get to overall frame sizes The general tolerances are 5mm all round or 10mm in both width and height If the threshold is to be sunk into the floor in order to reduce the step this dimension needs to be added once fitting tolerances have been deducted 5mm tolerance Figure 12 shows how door thresholds can be sunk into the floor in this render brick cladding in order to avoid problems Z E 5 case 30mm It is always 5 18 important to know about i PAN the final wall finish NE 3 5 Figure 12 particularly with open out doors Our technical team p can assist you if you have any question Bereco Delivering the Difference Sa Bereco DELIVERING THE DIFFERENCE Figure 13 shows why it is important to inform Bereco about the final wall finish 19mm Skirting board N 12 5mm Plasterboard ee Z i 5mm dot dab i normally 15mm WY Internal Blockwork Lf Figure 13
5. Court Centurion Business Park Bessemer Way Rotherham S60 1FB Tel 01709 838188 Fax 01709 838330 Email enquiriesQbereco co uk
6. are ordered Table 1 Max Reveal Cover for Windows Product Max Cover Jamb Max Cover Head Tilt amp Turn 10mm 5mm Lipped Casement 30mm Omm Flush Casement 35mm Omm Reversible 10mm 5mm SS Spiral Balance 41mm 41mm SS Cords amp Weights 95mm 41mm Should the reveal used be more than 10mm bigger for either jambs or heads than the dimensions shown above additional timber packers can be ordered to accommodate for it Remember Where the final wall finish is to be render the thickness needs to be included in the overall cover prior to ordering ie the final window size will be smaller in both width and height Internal Structural Opening Width Overall Frame Size Width 95 Window Daylight Width 95 rt y ZE ni DI pic m ING 5 2 DIS 22 DA me oes SSS Ss 7 77 7 Lift J Bel LOL ALY 7 PA TRA di SV External Structural Opening Width Daylight Size Reveal Size Figure 4 1 2 4 Manufacturing Size Flat Windows with Reveal with or without Cavity Closures Both dimensions of the external brickwork and the required cover determine the final window sizes The general rule to calculate overall width and height is Width daylight width 2x jamb cover Height daylight height head cover tolerance on cill usually 5 10mm Worked example Daylight sizes are 900mm wide x 1500mm high Sliding Sash window Cords amp Weights reveal size 100mm on ja
7. easy to measure and should be handled the same way like any other door That means it is necessary to think about reveals and final wall finishes There are 2 threshold options which both can be sunk into the floor see tables 2 amp 3 and figure 14 As these doors fold to the inside it is also necessary to think about Aluminium Mobility Threshold not availible with all models see brochure for details y LU sunk into Screed sunk into Screed C by 40mm leaving S by 21mm leaving NI 62mm step 18mm step Standard Timber Threshold availible with all models 18 RON Kw AR 77 Top of 20mm aH Top of 20mm FA 4 Flooring y tls Flooring w UN a FFL MHF 7 CASES el L i 3 i Ng ay ha uho e n Figure 14 the internal plasterboards skirting boards and tolerances towards walls Please contact Bereco for assistance Due to their size it is recommended to seek assistance during the measuring process in order to avoid mistakes 1 6 4 Doors coupled to windows When doors are coupled to windows for example Entrance Doors the overall aperture needs to be measured as one The procedures to measure are exactly the same as described before however a few more Sa Bereco DELIVERING THE DIFFERENCE dimensions are necessary in order to achieve a perfect fit Figure 15 shows which dimensions should be taken during measure In this case it is advisable to provide structural
8. opening sizes rather than calculating final window door sizes Tintel Figure 15 2 Installation This survey and installation manual is intended as a general guide to measuring and installing Bereco products By virtue of the wide variety of building types ages and construction methods it cannot offer solutions to cover all circumstances The final responsibility for accurate dimensions correct specification and compliance with all statutory regulations including health and safety codes of practice contract design management requirements and all other best practice procedures rests with the Approved Installer 2 1 Fixing Newbuild Situation All Bereco windows and doorsets should be fitted into preformed openings which are at least 10mm larger 5mm all round than the overall frame size In the case of new buildings or extensions frames should not be built in as the work proceeds Frames should be installed plumb and square using metal fixings or perimeter battens and Figure 16 shows typical fixing centres Please use spirit levels to assure windows and doorsets are installed plumb and square A minimum of two fixing points per side depending on height should be used These should be positioned at between 100mm amp 200mm in from each corner Additional fixings will depend on the size of the frame as follows Frame height up to 1000mm 2 per side 1000mm to 1600mm 3 per side 1601mm to 2
9. reveal with or without Cavity Closures 7 1 4 3 Flush amp French Doors Reveal with or without Cavity Closures 8 1 4 4 Manufacturing Size Flush amp French Doors Reveal with or without Cavity Closures 8 1 5 Measuring and Manufacturing Sizes for Doors in refurbishment situations 8 1 5 1 Flush amp French Doors no existing revedl iii been ee ddd ee een 8 1 5 2 Flush amp French Doors existing reveal 2 0 cee eens 8 1 6 Measuring Special Doors and Doors in Special Situations 0 0 0 000000 9 1 6 1 Sliding Patio Doors HS ascritte 9 1 6 2 Tilt amp Slide Doors PSK satconstesatetaseed do Shoo te ale dca na 9 1 6 3 Folding Sliding Doors FS 1 eredi 9 1 6 4 Doors coupled to WINKOWS iii ira ei 9 2 Installation eens 9 2A FRING tia MARSI 9 22 SUPPOLL siano rea ea a A n o s EI ees 10 ZI TR E ow each ae oe He eae eee ae ree amp ee ee anes 10 ZZ CGUPINO rile 6 CAR aa oe Lina 10 3 Final Inspection 0 0 0000000 0 000 eee eee 11 4 Site Re Glazing 225 lt 6045625 Iii 6h OSS ELESSE EE shee dedi 12 4 1Removing Timber Beads sassi LASSO eRe ee ere sr reses sees 12 4 2 Removing GlaSS ss tae dee ess ses snake hd dh ERE ARR 12 4 3 Replacing Glass amp Beads sso cir isf RATA BSG6 ee ed Ss EEE ES ni ei 12 5 Health amp Safety RR EC TIRI REA ani 12 Bereco Delivering the Difference 2 1 Surveying amp Measuring This survey and installation manual is intended as a general gu
10. 100mm 4 per side Over amp above maintain 450mm centres Where the frame width exceeds 1800mm or is formed by two or more coupled units fixings should be provided at the head and cill T 150mm Approx 7 A lt di gt 450mm Approx Centres 4 yo gt 450mm Approx Additional fixings to windows Centres Ps 1800mm wide and above ie SS gt 450mm Approx Ms Centres x tu S gt 150mm Approx J Vv I Figure 16 Bereco Delivering the Difference Figure 17 Sa Bereco DELIVERING THE DIFFERENCE Refurbishment Situation Fixing will normally be through the frame although fixing lugs which facilitate fixing from inside the building can also be used Purpose made nylon fixings are available These utilise the same diameter hole through the frame and substrate and are normally supplied together with screws Alternative fixings include a proprietary screw device which enables the window position to be adjusted on the fixing itself See figure 17 Fixings should not be over tightened and surrounding brickwork should abut the frame only lightly so that no frame distortion can occur Before final fixing check that opening sashes have equal clearance on both sides Mullions of multi light windows MUST be supported to avoid sagging Wall Window Gap adjusted by turning thread in window 2 2 Support Packing pieces should be located at all fixing points If additional packing pieces are required to raise
11. blocks need to be removed using the glazing chisel as lever The glass should then be removed from the inside from outside for Reversible windows 4 3 Replacing Glass amp Beads Remove the remainder of the silicone and the security tape from the glazing upstand Where security tape has been damaged replace it with new tape Place the glass into the glazing check ensuring equal spacing all around Correct spacing of the glass blocks is shown in Figure 23 The centre of the glazing block should be approximately 100mm from the corner Beads should be replaced fixing the smallest ones first then the longer ones ensuring compression on the glazing tape Nails should be punched and filled with appropriate coloured filler and the face of the bead should be repainted stained VERTICAL Su t i NI SLIDING FIXED LIGHT _ SIDE HUNG sl Figure 23 Bereco Delivering the Difference 12 Mechanical Offloading facilities are provided when elements are delivered to site using a Moffet Forklift vehicle The weight of each item is shown on the sales confirmation and there are health and safety instructions attached to each element It is the responsibility of the approved installer to make him her self aware of any Health amp Safety and Construction Design and Management Regulations that may apply to the work he she is undertaking Aspen Centurion Business Park Unit 5 Aspen
12. come this problem However there are various ways to avoid thermal bridges but the most elegant ways are shown in figures 5 6 7 Figure 5 2 Es RA Figure 5 1 Sa Bereco DELIVERING THE DIFFERENCE of i TR Y SS a SS SI AD PSS Wp N 7 T Sa ZA Figure 6 1 Figure 6 2 SY UU Ssg NA SEZ A d r A N SE Ta ed MER T es Figure 7 1 Figure 7 2 1 2 6 How to measure Bay windows Measuring bay windows is not as difficult as it may seem The most important rule in order to get the windows right is continuity in measurement where dimensions are taken the same way throughout The best ways to measure bay windows are Along the external face of the internal brick blockwork Along the internal face of the external brick blockwork favoured see Figure 8 Along the external face of the external brick blockwork To avoid errors and unnecessary questions it is important to stick to either one of these options and not to mix between them It is also necessary to know which wall detail Figure 6 2 7 2 is chosen and what size of cavity is used for the building If in doubt of how to measure bay windows a te or for further technical n aN details please contact i a the Bereco sales office i ee A 01709 838188 A fr Front Bay Width Figure 9 shows Overall Width of Bay Window dimensions that need N to be taken when ba
13. e taken between the external brickwork of both sides It is important to know reveal sizes which can be measured best with a metal ruler In order to measure the correct hard opening sizes it is necessary to remove existing render prior to the measure The overall door sizes can be easily calculated by adding the required reveal cover which should not exceed dimensions shown in table 3 Please also accommodate for sufficient fitting tolerance 5mm all round when door dimensions are calculated 1 6 Measuring Special Doors and Doors in Special Situations 1 6 1 Sliding Patio Doors HS HS Sliding Patio Doors are easy to measure and should be handled as any other door That means it is necessary to think about reveals final wall finishes and whether or not thresholds are going to be sunk into the finished floor see tables 2 amp 3 Due to their size however it is recommended to seek assistance during the measuring process in order to avoid mistakes 1 6 2 Tilt amp Slide Doors PSK PSK Tilt amp Slide Doors are easy to measure and should be handled the same way like any other door That means it is necessary to think about reveals and final wall finishes It is not possible to sink the threshold of these doors into finished floor see tables 2 amp 3 Due to their size it is recommended to seek assistance during the measuring process in order to avoid mistakes 1 6 3 Folding Sliding Doors FS PSK Tilt amp Slide Doors are
14. gs That means width and height measurements should also be taken in 3 places and diagonal dimensions should be checked The difference is the place where FE these dimensions are taken To determine the correct window size it is very important to allow for the la right cover In order to do that structural sizes required are daylight sizes ie dimensions between the external brickwork as shown on figure 3 and 4 In order to achieve the correct window size the correct reveal dimensions are required for example 100mm jamb reveal 50mm head reveal Figure 3 Bereco Delivering the Difference 1 2 3 continued By the use of pre formed Cavity Closures for the building it is again straight forward to achieve perfectly fitting windows since all openings are created with formers as they determine window sizes Planned dimensions can be taken off drawings however it is very important to know the correct reveal size in order to allow enough tolerance for both aesthetics and functional reasons Casement windows for example wouldn t open if tolerance was too little Table 1 shows the maximum coverage for different Bereco window types Note Please always provide a template when shaped angled arched windows
15. i Bereco DELIVERING THE DIFFERENCE Survey amp Installation Manual Timber Windows amp Doors Sa Bereco DELIVERING THE DIFFERENCE Contents 1 Survey amp Measuring _ rer ere rer ere rer rr eee 3 1 1 General Regulations a cccuuten ce Boers ou G4 is aoe tee oi er rr rer reses ere ess 3 1 2 Measuring Windows in new build situations LL 3 1 2 1 Flat Windows no reveal with or without Cavity Closures 0000 3 1 2 2 Manufacturing Size Flat Windows no Reveal with or without Cavity Closures 4 1 2 3 Flat Windows with Reveal with or without Cavity Closures 005 4 1 2 4 Manufacturing Size Flat Windows with Reveal with or without Cavity Closures 5 1 2 5 Bay Windows in new build situations LL 5 1 2 6 How to measure Bay WINDOWS iii us ina Peeks oh Road BEERS 5 1 2 7 Bereco Ltd Bay Ordering FOMM 2 4 sa x00eesadea dened Ei 6 1 3 Measuring Windows in refurbishment situations LL 6 1 3 1 Flat Windows no reveal 0 eee ee ee eee 6 1 3 2 Flat Windows existing reveal 5 0 ean des 44 oe rer rr rer Ow enne 6 1 3 3 Manufacturing Size Flat Windows either with or without existing reveal 6 1 3 4 Bay windows in refurbishment situations 2 00 00 0000 ce ee 6 1 4 Measuring Doors in new build situations LL 7 1 4 1 Flush amp French Doors no reveal with or without Cavity Closures 7 1 4 2 Manufacturing Size Flush amp French Doors no
16. ide to measuring and installing Bereco products By virtue of the wide variety of building types ages and construction methods it cannot offer solutions to cover all circumstances The final responsibility for accurate dimensions correct specification and compliance with all statutory regulations including health and safety codes of practice contract design management requirements and all other best practice procedures rests with the Approved Installer 1 1 General Regulations Windows are vital elements of houses and dwellings and therefore need to comply with various regulations in both their stand alone performance as well as in built in situations The following regulations will give information regarding these regulations Conservation of Fuel amp Power Ventilation England amp Wales AD L1A amp AD L1B England amp Wales Scotland Part J Scotland Section 3 Northern Ireland Technical Booklet F Northern Ireland Technical Booklet K England amp Wales ADB England amp Wale Scotland Part M Scotland Section 4 Northern Ireland Technical Booklet E Northern Ireland England amp Wales ADK AD Approved Document Scotland Section 4 Northern Ireland Technical Booklet H Guidance on Building Regulations can be found on the following websites for England amp Wales Department for Communities amp Local Government www communities gov uk for Scotland Scottish Building amp Standards Agency
17. ing Operation Sight Lines Sealing Bay Windows Area to be checked nN UW KR W N Windows installed plumb square and vertical Exposed faces including beads free from surface damage Window and frame clean and all protective film removed Check for damage around surrounding aperture Check all internal trims are installed correctly Check the site is clean and all debris is removed Glazing as specified No cracks or scratches on glass or signs of unit failure Obscure glass is oriented the correct way All opening sashes open and close correctly No air gaps between seals and frames No scraping or rubbing between Espagnolette and keepers When doors slam no bounce or outer frame movement All operation gear correctly lubricated All hardware attached with correct number of fixings Visually correct Adjacent vents aligned Sealant to be continuous around frame run No excess sealant to be present on frame faces Ensure no settlement of structure when temporary supports removed Check that flashings and DPC have not been disturbed or damaged 11 Bereco Delivering the Difference OK Yes No OO OO Uo so HUU Do Sa Bereco DELIVERING THE DIFFERENCE 4 Site Re Glazing 4 1 Removing Timber Beads Where de glazing is necessary cut the silicone along the glass timber edge with a utility knife and remove the silicone figure 21 Remove all timber beads starting with the longest ones by tapp
18. ing the bead towards the centre of the pane using a plastic glazing chisel see Figure 22 This should separate the bead from the sash or frame The chisel can then be used to prise it off completely Repeat this process for the remainder of the beads Remove any nails from the glazing rebate Nails that are left in the glazing bead should be pulled through the back of the bead with a pair of pincers to avoid break out through the face Remove any silicone from the beads use glazing Silicone the edge between glass and timber on both the inside and outside with correct coloured silicone BS 5889 approved Spray lubricated water on the silicone and use a PVC scraper to smoothen surface as shown in figure 24 step 1 silicone BS 5889 Figure 24 iN step 2 spray with lubricated water and smoothen surface with scraper For further glazing information please refer to BS 8000 Part 7 1990 BS6262 Glazing in Buildings amp NHBC Standards Charter 6 7 January 1999 edition as of January 2000 chisel towards the centre of the pane with a hammer 5 Health amp Safety Bereco windows and doors come packed in a loose polythene bag and securely strapped on wooden pallets Security Tape cut security tape Cut silicone on both inside and outside Figure 22 Figure 21 4 2 Removing Glass Before removing the sealed unit the double sided security tape must be cut from the outside and all glazing
19. irting board 12 5mm Plasterboard f 12 5mm Plasterboard 5mm dot dab WALL 5mm dot dab normally 15mm WO 17 IIS normally 15mm Internal Blockwork Internal Blockwork up 66 7 EMA SN i eni SI IT SS PE for P m 727 pee A 7 7 a KON SN IN cal _5mm tolerance esi 5mm tolerance External Blockwork 44 Of OSS External Blockwork __s o width measured to wall _ __s o width measured to wall _ i Figure 11 Sa Bereco DELIVERING THE DIFFERENCE Height measurements always need to be taken from the bottom of the lintel to the top of the Finished Floor at 3 different places as indicated above There are various types of thresholds available depending on access and building requirements For some of the thresholds please refer to Bereco Brochure it is possible to sink them into the floor to reduce the final step In order to do this screed needs to be cut or space needs to be allocated beforehand and the overall frame height needs to be increased by the size that the threshold is sunk in Door thresholds must not be sunk in too much especially with open in doors there is a danger that doors won t open once tiling timber flooring or carpets are finished Table 2 shows the maximum recommended size a door threshold should be sunk into the floor Table 2 Maximum floor cover for door thresholds please see Brochure for details Standard Site Coupling Mobility Option 1 Option
20. ld situations Doors of any kind like windows are not designed to be load bearing Please contact your structural engineer for advice especially when large door sets like Folding Sliding Doors or Sliding Patio Doors are considered General Regulations Building Regulations are valid for both windows and doors Please refer to the Building Regulations mentioned earlier in this manual 1 4 1 Entrance amp French Doors no reveal with or without use of Cavity Closure If Cavity Closures are used they can be ordered directly through Bereco then there is no survey required since all sizes are determined by the Closures If no Cavity Closures are used all dimensions should be taken like window sizes Width Measurement The width of the aperture should be measured at three points Top Middle Bottom The smallest dimension should be used to determine the width See Figure 1 Height Measurement The height of the aperture should be measured at three points Left Middle Right The smallest dimension should be used to determine the height See Figure 1 Figure 11 shows that the width measurement is taken between structural walls and it shows that it is very important to consider the final wall finish and its thickness in order to allow the door to open properly Usually the same cover is used on Jambs and Head of the doorframe Single Flush Door Open In Single Flush Door Open Out 19mm Skirting board 19mm Sk
21. mbs and 50mm on head Window Sizes Width 900mm 2 x 95mm1 1090mm overall width of window Height 1500mm 41mm1 10mm2 1531mm overall height of window 1 maximum cover for jambs and head 2 10mm tolerance used for cement bed at cill Be careful with this calculation that the reveal size is not either the same size or smaller than the maximum cover there is still some tolerance usually 5mm all round required to allow for a tight but easy fit In this case the maximum cover should be reduced to suit the reveal depth Again when Cavity Closures are used it is fairly straightforward to determine window sizes similar to straight through openings Bereco will assist you in this manner as best possible 1 2 5 Bay Windows in new build situations Bay windows whether square or angled require careful consideration when planning building detail and installation The Building Regulations Approved Document L require that the thermal performance around openings achieve levels that some traditional methods of bay window installation cannot meet In some situations a so called birds mouth detail was used to set the bay window into the corner of the brickwork Most of these details are unacceptable under current Regulations as they usually create a thermal bridge which causes heat loss and therefore invalidates achieved energy performance of the whole element In this manual we consider 2 different ways to over
22. n be applied ai l H I I gl il I see Figure 19 PE LIA Figure 19 2 4 Coupling When windows are coupled to doors see figure 15 they need to be coupled before installation see figure 20 Bereco provides jointing slips and cover facings Additional coupling material screws screw covers etc is supplied by the approved installer Jointing slips need to be glue fixed in relevant grooves and the overall construction has to be pre drilled and screw fixed at various places as shown in figure 20 internal amp external cover facings supplied loose by Bereco 4 S iG lt Jointing Slips provided loose Pre Drill and screw Figure 20 3 Final Inspection Sa Bereco DELIVERING THE DIFFERENCE Following completion a final inspection should be carried out to ensure that the installation is of the highest standard We recommend that there should be a formal procedure for checking the work using a checklist similar to the one shown below We also recommend that these checks should be carried out in the presence of the customer who should be familiarised with the operation and Bereco operating and maintenance instructions should be left with the customer Inspection Visual Appearance Glaz
23. ows we recommend forwarding structural opening sizes instead of final window sizes to accommodate for additional requirements The technical team at Bereco will assist you in this 1 3 Measuring Windows in refurbishment situations 1 3 1 Flat Windows no existing reveal Replacement windows are usually measured and ordered before the existing windows are taken out and extra care is required during site measure Width Measurement The width of the aperture should be measured at three points Top Middle Bottom The smallest dimension should be used to determine the width See Figure 1 Height Measurement The height of the aperture should be measured at three points Left Middle Right The smallest dimension should be used to determine the height See Figure 1 Bereco Delivering the Difference It is important that the external wall to wall dimensions are taken and not the old frame sizes In order to do so render and sealing mastic need to be removed prior to the measure It is also necessary to inform Bereco about the existing cill detail and required cill extensions Please always check for reveals that might eventually exist 1 3 2 Flat Windows existing reveal Similar to a survey of existing flat windows without reveal it is Important for existing windows with reveal to measure both width and height at various places and all dimensions again need to be wall to wall dimensions ie all render needs to be
24. rall Frame Size Sa Bereco DELIVERING THE DIFFERENCE 1 2 2 Manufacturing Size Flat Windows no reveal with or without Cavity Closures With Cavity Closures When Cavity Closures are used the actual Cavity Closure determines the window size so no site measures are required Dimensions for the Closure are taken off plans A major advantage of using Cavity Closures is that a perfect fit can be achieved correct tolerances are allowed for Moreover all windows can be ordered in advance As a result the building process will not be held up by delays Cavity Closures can be ordered by Bereco please contact the office for details Without Cavity Closures When no Cavity Closures are used tolerances between the structural opening size and the overall window size need to be taken into account This is necessary to allow the window to be fixed to walls and to insulate all window wall connections The overall tolerances for flat windows should be 10mm in both width and height 5mm all round to allow for easy handling and fixing as well as a tight fit Further information can be found in British Standard BS 644 Note Please always provide a template when shaped angled arched windows are ordered 1 2 3 Flat Windows with reveal with or without Cavity Closures The general rules for measuring windows where a reveal has been formed are the same as for flat windows with LLL A gt LZ 4 straight through openin
25. removed It is also necessary to measure the existing reveal size at both jambs and head This is best possible with a metal ruler or a screwdriver Detailed information regarding the cill detail required cill extension is necessary to assure full performance of all new windows 1 3 3 Manufacturing Size Flat Windows either with or without existing reveal Once the structural dimensions have been taken tolerances need to be added in order to allow a perfect fit In this circumstance the same rules are valid as those for windows in a new build situation Please allow for sufficient tolerances and beware of maximum cover for existing reveals see table 1 1 3 4 Bay windows in refurbishment situations The steps to measure bay windows for refurbishment situations are the same as for flat windows however it might be a bit more difficult to get to the correct wall to wall dimensions Therefore render plaster needs to be removed at various places in order to take the dimensions correctly Furthermore it is necessary to know in what way the bay window is connected to the walls and what the wall is made of ie size of cavity bricks and cill details Note Please always provide structural opening sizes rather than calculating final window sizes for bay windows in refurbishment situations It is also always helpful for our technical team if photographs can be supplied for any difficult situation 1 4 Measuring Doors in new bui
26. res Measuring doors in new build situations and when a reveal is formed is as straightforward as with windows in the same situation That means that the external brick to brick dimensions need to be taken and reveal sizes and cover needs to be considered see worked example page 5 and table 3 Please also consider by how much if at all thresholds are going to be sunk into the floor 1 5 Measuring and Manufacturing Sizes for Doors in refurbishment situations 1 5 1 Flush amp French Doors no existing reveal The steps to measure doors for refurbishment situations are exactly the same as for replacement windows That means both width and height need to be measured in different places once plaster has been removed in order to provide wall to wall sizes Do not measure the existing frame It is unlikely that thresholds will be sunk into the floor when doors are replaced so height dimensions should be taken between lintel and finished floor that is below tiles carpet timber flooring However if sinking in is still required please follow the steps outlined above Once these dimensions have been taken fitting tolerances need to be deducted Be careful that the final wall finish does not exceed the recommended dimensions for frame covers see table 3 1 5 2 Flush amp French Doors existing reveal The measurement of doors with existing reveals is as simple as measuring doors without The required dimensions are again to b
27. the position of the frame in the aperture or to compensate for the base of an aperture that is not level all mullions must be supported as shown in figure 16 amp 18 If additional packing pieces are required to raise the position of the frame in the aperture or to compensate for the base of an aperture that is not level all mullions must be supported as shown in Figure 16 amp 18 Particular care is necessary when providing packing to vertical sliding windows where even minor distortions can prevent the movement of the sashes or introduce excessive clearance When fitting packing the correct operation of sashes should be checked prior to fixing and a mortar bed can be used to provide continuous support at cill level Additional support under mullions MUST be provided when packing pieces are used Figure 18 i 150mm Max 150mm Max I Bereco Delivering the Difference 2 3 Sealing To prevent air infiltration between the window door and adjacent wall the gap between the window and wall should be sealed Polythene backed sealing strips can be fitted prior to installation or alternatively an expanding foam seal or mineral wool can be fitted after installation has been completed When using gap filling ta o e foams avoid injecting T excessive amounts as this may deflect the jambs and l induce vertical bow ZA an Finally a silicone or i o polysulphide based sealant a Approved to BS 5889 _ should the
28. y windows are ordered please use Bereco bay window ordering form 7 Sa i x a overall projection of Bay DO EA A i In this case all dimensions are taken gt along the inside face of amp VV S the external block brickwork It is not crucial to measure diagonal dimensions 1 and 2 for square bay windows however it gives the opportunity to check if the 90 degrees angles are correct they are if both diagonals give the same dimension Figure 9 It is Important to take some dimensions at various points for example the overall projection in order to spot any abnormalities Height dimensions need to be taken from the cill to the lintel at various points similar to the measurement of flat windows Bereco Delivering the Difference Sa Bereco DELIVERING THE DIFFERENCE Figure 10 MM I I di de l K o Wa p s if A N We od Yr LR tv f 2 1 2 7 Bereco Ltd Bay Ordering Form Please always comment on e Where the dimensions have been taken from internal external face of internal external blockwork e What size of Cavity is chosen for the building e Which wall detail is going to be used see Figures 5 6 7 e What cill is going to be used eg sloped brick cill pre cast concrete stone cill e Vhat external wall finish will be used e Vhat cill extension size is required Note For bay wind
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