Regulations Detail Sheet 1

Transcription

1 CI/SfB Timloc Building Products Limited Rawcliffe Road Goole Humberside DN14 6UQ Tel: Fax: website: Xn6 Agrément Certificate No 93/2937 Second issue* Designated by Government to issue European Technical Approvals TIMLOC CAVITY TRAYS Couche étanche pour murs Tablett für zweischalige Wände Product THIS CERTIFICATE REPLACES CERTIFICATE No 89/2229 AND RELATES TO TIMLOC CAVITY TRAYS. The products are used as damp-proof courses in cavity walls of brick, block, stone and dry lining construction, in the combinations and situations defined in the accompanying Detail Sheets. These Front Sheets must be read in conjunction with the accompanying Detail Sheets, which provide information specific to the trays. Regulations Detail Sheet 1 1 The Building Regulations 2000 (as amended) (England and Wales) The Secretary of State has agreed with the British Board of Agrément the aspects of performance to be used by the BBA in assessing the compliance of damp-proof courses with the Building Regulations. In the opinion of the BBA, Timloc Cavity Trays, if used in accordance with the provisions of this Certificate, will meet or contribute to meeting the relevant requirements. Requirement: A1 Loading Requirement: C2(b) Resistance to moisture The material properties of the products indicate that when properly installed the ability of the wall to sustain and transmit compressive loads will not be adversely affected. The presence of a dpc can reduce the shear and tensile strength of a wall at that point, and the design may need to take account of this. See the tinted area in the Performance under load section of these Front Sheets. The products when properly installed will prevent water that has penetrated the outer leaf of a cavity wall from reaching the inner leaf or lower parts of the wall. See the tinted area in the Resistance to passage of water section of the accompanying Detail Sheets. Requirement: Regulation 7 Materials and workmanship The products are acceptable. See the tinted area in the Durability section of these Front Sheets. Readers are advised to check the validity of this Certificate by either referring to the BBA s website ( or contacting the BBA direct (Telephone Hotline ).

2 2 The Building (Scotland) Regulations 2004 In the opinion of the BBA, Timloc Cavity Trays, if used in accordance with the provisions of this Certificate, will satisfy or contribute to satisfying the various Regulations and related Mandatory Standards as listed below. Regulation: 8 Fitness and durability of materials and workmanship Regulation: 8(1) Fitness and durability of materials and workmanship The products can contribute to a construction satisfying this Regulation. See the tinted area in the Durability section of these Front Sheets and Installation section of the relevant accompanying Detail Sheets. Regulation: 9 Building standards construction Standard: 1.1(a)(b) Structure The products, when properly installed will not adversely affect the ability of the wall to sustain and transmit compressive loads. The presence of a dpc can reduce the shear and tensile strength of a wall at that point, and the design may need to take account of this, with reference to clause (1)(2). See the tinted area in the Performance under load section of these Front Sheets. Standard: 3.10 Precipitation The products can contribute to a construction satisfying this Standard, with reference to clauses (1)(2) and (1)(2). See the tinted area in the Resistance to passage of water section of the accompanying Detail Sheets. (1) Technical Handbook (Domestic). (2) Technical Handbook (Non-Domestic). 3 The Building Regulations (Northern Ireland) 2000 (as amended) In the opinion of the BBA, Timloc Cavity Trays, if used in accordance with the provisions of this Certificate, will satisfy or contribute to satisfying the various Building Regulations as listed below. Regulation: B2 Fitness of materials and workmanship The products are acceptable. See the tinted area in the Durability section of these Front Sheets. Regulation: C4 Resistance to ground moisture and weather Regulation: D1 Stability The products when properly installed will prevent any water that has penetrated the outer leaf of a cavity wall from reaching the interior or the lower parts of the wall. See the tinted area in the Resistance to passage of water section of the accompanying Detail Sheets. The products when properly installed will not adversely affect the ability of the wall to sustain and transmit compressive loads. The presence of a dpc can reduce the shear and tensile strength of a wall at that point, and design may need to take account of this. See the tinted area in the Performance under load section of these Front Sheets. 4 Construction (Design and Management) Regulations 1994 (as amended) Construction (Design and Management) Regulations (Northern Ireland) 1995 (as amended) Information in this Certificate may assist the client, planning supervisor, designer and contractors to address their obligations under these Regulations. See section: 6 Description and site handling (6.5) of these Front Sheets. Technical Specification 5 Description 5.1 Timloc Cavity Trays are either vacuum formed or injection moulded from polyethylene or polypropylene as described in the accompanying Detail Sheets. 5.2 Certain trays include an integral weep/vent and an attached code-blue (1) lead flashing. (1) As defined by BS EN : Quality control tests are conducted on the raw materials and on the finished products A range of ancillary items is available for use with the range of products and includes: stop ends for terminating a tray or run of trays and channelling water from a wall corner units available in internal or external forms ridge change-over unit for maintaining the continuity of an installation in step and stagger situations weeps for channelling water from a wall butyl sealant tape.

3 6 Delivery and site handling 6.1 The trays, accessories and installation instructions are packed in corrugated cardboard cartons, as described in the accompanying Detail Sheets. 6.2 Each pack or roll carries a label bearing the BBA identification mark incorporating the number of this Certificate. 6.3 To prevent damage or surface contamination, they should be stored in a safe place in the original packaging. Rolls should be stored on end. 6.4 Leaded trays should be lifted by the lead flashing and not by the back of the tray. Safety 6.5 The conventional precautions for handling lead, defined in the HSE publication Control of Lead at Work Regulations 1998 Approved Code of Practice, Regulations and Guidance, should be observed when using cavity trays with lead flashing. Design Data 7 General Timloc Cavity Trays and accessories, when correctly specified and installed in accordance with this Certificate and with BS : 2005 and BS 8215 : 1991, will provide a satisfactory damp-proof course in the situations described in the accompanying Detail Sheets. 8 Practicability of installation 8.1 The products can be installed easily by a competent bricklayer using conventional skills. Trays can be cut, if necessary, using a sharp knife. 8.2 Trays may be installed in any weather that permits bricklaying, but can suffer damage if handled carelessly at freezing temperatures. 8.3 Trays must be laid between even beds of mortar, and any perforations or frogs in adjacent courses should be filled with mortar. 8.4 Precautions are necessary to prevent damage to the trays when the cavities are cleaned, and include: use of cavity battens to reduce mortar droppings on the trays removal of mortar droppings before they harden, using a technique that avoids causing damage to the tray (use of steel rods, for example, should be avoided) inspection of trays for damage as the work proceeds. 8.5 Weepholes should be provided in the positions described in BS : 2005 and BS 8215 : Performance under load The products will not adversely affect the ability of a wall to sustain and transmit compressive loads. However, the presence of a dpc can reduce the shear and tensile (and therefore bending) strengths of a wall and the effect of wind and other horizontal or upward forces should be considered at the design stage. 10 Durability When installed correctly into the cavity, the trays will remain effective for the expected life of the building. Technical Investigations The following is a summary of the technical investigations carried out on Timloc Cavity Trays. 11 Tests As part of the assessment leading to the issue of previous Certificates, tests were carried out to determine: specific gravity melt flow index Vicat softening point resistance to water penetration ease of installation impact resistance thermal distortion. 12 Investigations 12.1 The manufacturing process was examined, including the methods adopted for quality control, and details were obtained of the quality and composition of the materials used Visits were made to sites in progress to assess the practicability of installation User surveys have been carried out to ensure that the products are performing satisfactorily in service A re-examination was made of the data and investigations on which the previous Certificate was based and an assessment was made of the current designs. The original conclusions drawn remain valid. Additional Information The management systems of Timloc Building Products Limited have been assessed and registered as meeting the requirements of BS EN ISO 9001 : 2000 by the British Standards Institution Quality Assurance (Certificate No Q6236). 3

4 Bibliography BS EN : 1999 Lead and lead alloys Rolled lead sheet for building purposes BS : 2005 Code of practice for use of masonry Materials and components, design and workmanship BS 8215 : 1991 Code of practice for design and installation of damp-proof courses in masonry construction BS EN ISO 9001 : 2000 Quality management systems Requirements Conditions of Certification 13 Conditions 13.1 This Certificate: relates only to the product/system that is named and described on the front page is granted only to the company, firm or person named on the front page no other company, firm or person may hold or claim any entitlement to this Certificate is valid only within the UK has to be read, considered and used as a whole document it may be misleading and will be incomplete to be selective is copyright of the BBA is subject to English law References in this Certificate to any Act of Parliament, Statutory Instrument, Directive or Regulation of the European Union, British, European or International Standard, Code of Practice, manufacturers instructions or similar publication, are references to such publication in the form in which it was current at the date of this Certificate This Certificate will remain valid for an unlimited period provided that the product/system and the manufacture and/or fabrication including all related and relevant processes thereof: are maintained at or above the levels which have been assessed and found to be satisfactory by the BBA continue to be checked as and when deemed appropriate by the BBA under arrangements that it will determine are reviewed by the BBA as and when it considers appropriate In granting this Certificate, the BBA is not responsible for: the presence or absence of any patent, intellectual property or similar rights subsisting in the product/system or any other product/system the right of the Certificate holder to manufacture, supply, install, maintain or market the product/system individual installations of the product/system, including the nature, design, methods and workmanship of or related to the installation the actual works in which the product/system is installed, used and maintained, including the nature, design, methods and workmanship of such works Any information relating to the manufacture, supply, installation, use and maintenance 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 and maintained. It does not purport in any way to restate the requirements of the Health & Safety at Work etc Act 1974, or of any other statutory, common law or other duty which may exist at the date of this Certificate; nor is conformity with such information to be taken as satisfying the requirements of the 1974 Act or of any statutory, common law or other duty of care. In granting this Certificate, the BBA does not accept responsibility to any person or body for any loss or damage, including personal injury, arising as a direct or indirect result of the manufacture, supply, installation, use and maintenance of this product/system. In the opinion of the British Board of Agrément, Timloc Cavity Trays are fit for their intended use provided they are installed, used and maintained as set out in this Certificate. Certificate No 93/2937 is accordingly awarded to Timloc Building Products Limited. On behalf of the British Board of Agrément Date of Second issue: 26th March 2007 Chief Executive *Original Certificate issued 27th August This amended version includes reference to revised national Building Regulations and Standards, the inclusion of CDM Regulations, additional information on safety, and new Conditions of Certification. British Board of Agrément Bucknalls Lane, Garston, Watford, Herts WD25 9BA Fax: mail@bba.star.co.uk website: For technical or additional information, contact the Certificate holder (see front page). For information about the Agrément Certificate, including validity and scope, tel: Hotline , or check the BBA website.

5 CI/SfB (21.9) Xn6 Timloc Building Products Limited Certificate No 93/2937 DETAIL SHEET 4 SYSTEM 2000E CAVITY TRAYS Product SYSTEM 2000E CAVITY TRAYS ARE A RANGE OF REMEDIAL TRAYS USED TO FORM A DAMP-PROOF COURSE IN EXISTING BRICK CAVITY WALLS OF BETWEEN 50 mm AND 100 mm CAVITY WIDTH AT THE ABUTMENT OF A PITCHED ROOF, A FLAT ROOF, ABOVE LINTELS OR BELOW SILLS. This Detail Sheet must be read in conjunction with the Front Sheets, which give data common to the product range, and the Conditions of Certification. Technical Specification 1 Description 1.1 System 2000E Cavity Trays are vacuum formed from 1.7 mm medium density polyethylene with a textured surface. They are not built into the inner leaf, but may be bonded to the inner leaf, if required using a butyl sealing strip. 1.2 The products are available in ranges of three stepped or two horizontal forms, as shown in Table 1 and Figure Each tray is fitted with butyl sealing tape, for sealing of all joints between trays. 1.4 System 2000E Horizontal Trays are also available with integral Code 4 (1) lead flashings attached. A strip of butyl sealant is positioned between the tray and the flashing to act as a seal. The width of lead flashing can be specified according to the particular design required. Leaded internal and external corners are also available. (1) as defined by BS 1178 : Table 1 Design and dimensions (1) Designation Roof pitch Cavity width Length (mm) (mm) Stepped (L) (I) (S) Horizontal (2) (1) Other sizes can be produced to special order to suit a particular installation. (2) Available either with or without integral lead flashing. 2 Delivery and site handling The trays are packed in corrugated cardboard cartons (see section 5 of the Front Sheets of this Certificate). Figure 1 Examples of trays Readers are advised to check the validity of this Detail Sheet by either referring to the BBA s website ( or contacting the BBA direct (Telephone Hotline ).

6 Design Data 3 Resistance to passage of water 3.1 System 2000E Cavity Trays sealed together and to the inner leaf provide a continuous barrier against liquid water, when installed in accordance with this Certificate, BS 5628 : Part 3 : 1985 and BS 8215 : Where the trays are not sealed to the inner leaf, although the top edge of the tray may not be in contact, any drips from wall ties will be intercepted by the tray. 4 Use with cavity wall insulation 4.1 Medium density polyethylene has no effect on, and is unaffected by, materials currently used as cavity wall insulants. However, where the trays are not bonded to the inner leaf, they do not form a continuous mechanical barrier, and blown or injected insulant may penetrate from the cavity above to below the trays. 4.2 This possibility must be considered when an in-situ applied cavity insulant is used. In particular, precautions should be taken to prevent urea formaldehyde fumes from reaching occupied parts of the building. Installation 5 Procedure Stepped trays 5.1 The required number of bricks are removed from the required position, 150 mm above the roof truss, or other abutting structure, at its foot. 5.2 A stopend is bonded to the first tray using the integral butyl sealant tape and the tray is laid on an even bed of mortar. The upstand of the tray may be fixed to the inner leaf, if required using a butyl sealing strip. 5.3 The bricks are replaced and the sequence is repeated, sealing all lap joints using the integral butyl tape. Different pitches can be achieved by cutting bricks as required. 5.4 If necessary, continuity can be maintained at the apex between right-hand and left-hand series of stepped trays using System 2000E Horizontal Trays. Alternatively, the run may be terminated using a second stopend. Horizontal trays 5.5 The required number of bricks for the length of tray to be installed are removed from the required position, 150 mm above the feature. 5.6 A stopend is bonded to the first tray using the integral butyl sealant tape and the tray is laid on an even bed of mortar. The upstand of the tray may be fixed to the inner leaf, if required using a butyl sealing strip. 5.7 The bricks are replaced and the sequence is repeated, sealing all lap joints using the integral butyl strip. The run is terminated by fixing a second stopend in the appropriate position. 5.8 Trays over a lintel must extend at least 100 mm beyond each end of the lintel. 5.9 Where pre-leaded horizontal trays are used, the flashing is dressed directly over the roof surface as required If flashing is required for unleaded trays, the joint below the tray is raked out and the flashing inserted to extend under the tray by a minimum of 25 mm. Wedges are inserted above the tray to ensure good contact between it and the flashing. The joint is repointed and the flashing dressed over the roof surface Flashings may be lead, or any other soft metal covered by, and used in accordance with, a current BBA Certificate. Bibliography BS 1178 : 1982 Specification for milled lead sheet for building purposes BS 5628 Code of practice for use of masonry Part 3 : 1985 Materials and components, design and workmanship BS 8215 : 1991 Code of practice for design and installation of damp-proof courses in masonry construction On behalf of the British Board of Agrément Date of issue: 27th August 1993 Director Recreated in QuarkXPress April 2003 British Board of Agrément P O Box No 195, Bucknalls Lane Garston, Watford, Herts WD25 9BA Fax: mail@bba.star.co.uk website: For additional information about the Certificate, tel: For information about Agrément Certificate validity and scope, tel: Hotline , or check the BBA website.

7 CI/SfB (21.9) Xn6 Timloc Building Products Limited TIMLOC VEE CAVITY TRAYS Certificate No 93/2937 DETAIL SHEET 5 Product TIMLOC VEE CAVITY TRAYS ARE FOR CREATING A DAMP-PROOF COURSE AT THE ABUTMENT OF A PITCHED ROOF WITH A CAVITY WALL FEATURING A CAVITY WIDTH OF BETWEEN 50 mm AND 100 mm AND A MAXIMUM EXTERNAL COURSE HEIGHT OF 90 mm. This Detail Sheet must be read in conjunction with the Front Sheets, which give the product's position regarding the Building Regulations, information common to the product range, and the Conditions of Certification. Technical Specification 1 Description 1.1 Timloc Vee Cavity Trays are vacuum formed from 1.0 mm medium density polyethylene with a textured surface (certain ancillary items are manufactured from 1.7 mm MDPE). The trays are designed to fold up against the inner leaf, without any mechanical fixing, but may be fixed using a butyl sealing strip if required. 1.2 The trays may be folded on site to give either left-handed or right-handed forms. 1.3 The trays are available in a range of sizes to suit different roof pitches and cavity widths (see Table 1 and Figure 1). Figure 1 Vee tray and components Table 1 Design and dimensions Designation Minimum roof pitch Cavity width (1) Length for external course height of 75 mm (mm) (mm) VS VI(470) VI(600) VL (1) Available in three sizes to suit 50 mm, 75 mm or 100 mm cavities. 1.4 A ridge tray (see Figure 1) is used to straddle the ridge and discharge water left and right. 1.5 Two forms of weep are available to discharge water at the bottom of the run: a straightthrough weep to discharge water in line with the run of trays (ie at a corner) and a stopend weep to discharge perpendicular to the run. 2 Delivery and site handling The trays are packed in corrugated cardboard cartons (see section 5 of the Front Sheets of this Certificate). Readers are advised to check the validity of this Detail Sheet by either referring to the BBA s website ( or contacting the BBA direct (Telephone Hotline ).

8 Design Data 3 Resistance to passage of water 3.1 Timloc Vee Cavity Trays do not form a continuous barrier against liquid water, but a 100 mm minimum overlap between successive trays is sufficient to prevent penetration of water below the units (provided the course step height does not exceed 90 mm) when the trays are installed in accordance with this Certificate, BS 5628 : Part 3 : 1985 and BS 8215 : Where the trays are not sealed to the inner leaf, although the top edge may not be in contact, any drips from the wall ties will be intercepted by the tray. 4 Use with cavity wall insulation 4.1 Medium density polyethylene has no effect on, and is unaffected by, materials currently used as cavity wall insulants. However, the trays do not form a continuous cavity barrier, and blown or injected insulant may penetrate from the cavity above to below the trays. 4.2 This possibility must be considered when an in-situ applied cavity insulant is used. In particular, precautions should be taken to prevent urea formaldehyde fumes from reaching occupied parts of the building. Installation 5 Procedure 5.1 The outer leaf is built up to 150 mm above the upper surface of the roof truss or other abutting structure, at its foot. The next course of the outer leaf is laid to fit the vee tray. 5.2 The appropriate stopend is bonded to the first tray using butyl sealant tape and the bottom tray is laid on an even bed of mortar. The tray is folded so that the upstand is in contact with the inner leaf. It may be bonded using a butyl sealant strip if required. 5.3 Installation should continue progressively, with each successive tray overlapping the previous tray by a minimum of 100 mm. 5.4 A ridge tray is installed in the same way at the top of the run. 5.5 The joint below the tray is raked out and the flashing inserted to extend under the tray by a minimum of 25 mm. Wedges are inserted above the tray to ensure good contact between it and the flashing. The joint is repointed and the flashing dressed over the roof surface. 5.6 Flashings may be lead, or any other soft metal covered by, and used in accordance with, a current BBA Certificate. Bibliography BS 5628 Code of practice for use of masonry Part 3 : 1985 Materials and components, design and workmanship BS 8215 : 1991 Code of practice for design and installation of damp-proof courses in masonry construction On behalf of the British Board of Agrément Date of issue: 27th August 1993 Director Recreated in QuarkXPress April 2003 British Board of Agrément P O Box No 195, Bucknalls Lane Garston, Watford, Herts WD25 9BA Fax: mail@bba.star.co.uk website: For additional information about the Certificate, tel: For information about Agrément Certificate validity and scope, tel: Hotline , or check the BBA website.

9 CI/SfB (21.9) Xn6 Timloc Building Products Limited Certificate No 93/2937 DETAIL SHEET 7 TIMLOC EVERDRY CAVITY TRAYS Product TIMLOC EVERDRY CAVITY TRAYS ARE USED FOR CREATING A DAMP-PROOF COURSE AT THE ABUTMENT OF A PITCHED ROOF AND A CAVITY WALL (BRICK-BRICK, BRICK-BLOCK OR TIMBER FRAME WITH A BRICK CLADDING) FOR CAVITY WIDTHS BETWEEN 50 mm AND 125 mm, AND A MINIMUM ROOF PITCH OF 10. This Detail Sheet must be read in conjunction with the Front Sheets, which give the product s position regarding the Building Regulations, information common to the product range, and the Conditions of Certification. Technical Specification 1 Description 1.1 Timloc Everdry Cavity Trays are either injection moulded from 1.6 mm polypropylene or vacuum formed from 2.0 mm medium density polyethylene. The trays are available in left-handed and righthanded forms, and are preformed to rest against the inner leaf. They may be fixed using a butyl sealing strip if required. 1.2 The trays are available in three widths (to fit cavity widths of 50 mm, 75 mm and 100 mm) and two lengths (340 mm polyproplyene and 525 mm MDPE) to suit different roof pitches, as shown in Table 1. Table 1 Minimum pitch angle Everdry 340 mm Everdry 525 mm Angle A ridge tray is used to straddle the ridge and discharge water left and right. This is injection moulded from 1.6 mm polypropylene (see Figure 1). Figure 1 Examples of trays 1.4 A stopend/starter tray, injection moulded from 1.6 mm polypropylene, is used at the lowest point of the abutment. However, if the abutting roof projects beyond the side of the main building, then a corner starter tray moulded from 2.0 mm MDPE is used. 1.5 All tray types are available with integral Code 4 (1) lead flashings attached. (1) as defined by BS 1178 : Delivery and site handling The trays are packed in corrugated cardboard cartons (see section 5 of the Front Sheets of this Certificate). Design Data 3 Resistance to passage of water 3.1 Timloc Everdry Cavity Trays do not form a continuous barrier against liquid water, but a 100 mm minimum overlap between successive trays is sufficient to prevent penetration of water below the units when the trays are installed in accordance with this Certificate, BS 5628 : Part 3 : 1985 and BS 8215 : Where the trays do not contact the inner leaf, care must be taken to ensure that the trays project far enough into the cavity to intercept any drips which originate from the wall ties. 4 Use with cavity wall insulation 4.1 Medium density polyethylene and polypropylene have no effect on, and are unaffected by, materials currently used as cavity wall insulants. However, the trays do not necessarily form a continuous cavity barrier and blown or injected insulant may penetrate from above to below the trays. Readers are advised to check the validity of this Detail Sheet by either referring to the BBA s website ( or contacting the BBA direct (Telephone Hotline ).

10 4.2 This possibility must be considered when an in-situ applied cavity insulant is used. In particular, precautions should be taken to prevent formaldehyde fumes from reaching occupied parts of the building. Installation 5 Procedure 5.1 The outer leaf is built up to 150 mm above the upper surface of the roof truss or other abutting structure, at its foot. The next course of the outer leaf is laid to fit the tray. 5.2 A stopend/starter tray is laid on an even bed of mortar. It is arranged so that the upstand is in contact with the inner leaf. It may be bonded using a butyl sealant strip, if required. 5.3 Installation should continue progressively with the appropriate intermediate trays, with each successive tray overlapping the previous tray by a minimum of 100 mm. Different pitches can be achieved by cutting bricks as required. 5.4 A ridge tray is installed in the same way at the top of the run. 5.5 Where pre-leaded trays are used, the flashing is dressed directly over the roof surface as required. 5.6 If flashing is required for unleaded trays, the joint below the tray is raked out and the flashing inserted to extend under the tray by a minimum of 25 mm. Wedges are inserted above the tray to ensure good contact between it and the flashing. The joint is repointed and the flashing dressed over the roof surface. 5.7 Flashings may be lead, or any other soft metal covered by, and used in accordance with, a current BBA Certificate. Bibliography BS 1178 : 1982 Specification for milled lead sheet for building purposes BS 5628 Code of practice for use of masonry Part 3 : 1985 Materials and components, design and workmanship BS 8215 : 1991 Code of practice for design and installation of damp-proof courses in masonry construction On behalf of the British Board of Agrément Date of issue: 7th June 1996 Director Recreated in QuarkXPress April 2003 British Board of Agrément P O Box No 195, Bucknalls Lane Garston, Watford, Herts WD25 9BA Fax: mail@bba.star.co.uk website: For additional information about the Certificate, tel: For information about Agrément Certificate validity and scope, tel: Hotline , or check the BBA website.

11 CI/SfB (21.9) Xn6 Timloc Building Products Limited TIMLOC ADJUSTABLE EVERDRY CAVITY TRAYS Certificate No 93/2937 DETAIL SHEET 8 Product TIMLOC ADJUSTABLE EVERDRY CAVITY TRAYS ARE USED FOR CREATING A DAMP-PROOF COURSE AT THE ABUTMENT OF A PITCHED ROOF AND A CAVITY WALL (BRICK-BRICK, BRICK-BLOCK OR TIMBER FRAME WITH A BRICK CLADDING) FOR CAVITY WIDTHS BETWEEN 50 mm AND 110 mm, AND A MINIMUM ROOF PITCH OF This Detail Sheet must be read in conjunction with the Front Sheets, which give the product s position regarding the Building Regulations, information common to the product range, and the Conditions of Certification. Technical Specification 1 Description 1.1 Timloc Adjustable Everdry Cavity Trays are injection moulded from 2.0 mm polypropylene. The trays are available in left-handed and righthanded forms, and feature an adjustable back upstand for use in cavities between 50 mm and 110 mm wide. 1.2 The trays are available in two lengths to suit different roof pitches, as shown in Table 1. Table 1 Roof pitch angle (using 75 mm brick) Length of tray (mm) Angle ( ) A ridge tray is used to straddle the ridge and discharge water left and right. 1.4 A stop end/starter tray is used at the lowest point of the abutment. However, if the abutting roof projects beyond the side of the main building, then a Corner Starter Tray is used. 1.5 All tray types are available with integral code-blue lead flashing to BS EN : Trays are available with pre-applied polystyrene strip which can later be easily raked out to provide a groove in the mortar bed for the installation of lead flashing. 2 Delivery and site handling The trays are packed in corrugated cardboard cartons (see the Delivery and site handling section of the Front Sheets of this Certificate). Design Data 3 Resistance to passage of water 3.1 Timloc Adjustable Everdry Cavity Trays do not form a continuous barrier against liquid water, but the overlap between successive trays is sufficient to prevent penetration of water below the units when the trays are installed in accordance with this Certificate and to BS : 2005 and BS 8215 : Where the trays do not contact the inner leaf, care must be taken to ensure that the trays project far enough into the cavity to intercept any drips which originate from the wall ties. 4 Use with cavity wall insulation 4.1 Polypropylene has no effect on, and is unaffected by, materials currently used as cavity wall insulants. 4.2 The trays do not necessarily form a continuous cavity barrier and blown or injected insulant may penetrate from above to below the trays. This possibility must be considered when an in-situ applied cavity insulant is used. 4.3 When using formaldehyde-based insulants precautions should be taken to prevent fumes from reaching occupied parts of the building. Readers are advised to check the validity of this Detail Sheet by either referring to the BBA s website ( or contacting the BBA direct (Telephone Hotline ).

12 Figure 1 Examples of trays corner starter tray stop end starter tray intermediate tray (LH) (showing front groove for optional integral lead flashing) ridge tray (showing front groove for optional integral lead flashing) 2

13 Installation 5 Procedure 5.1 The outer leaf is built up to 150 mm above the upper surface of the roof truss or other abutting structure, at its foot. The next course of the outer leaf is laid to fit the tray. 5.2 A stop end/starter tray is laid on an even bed of mortar at the lowest point(s) of the installation. 5.3 Installation should continue progressively with the appropriate intermediate trays, with each successive tray overlapping the previous tray. Different pitches can be achieved by cutting bricks as required. 5.4 A ridge tray is installed in the same way at the top of the run. 5.5 Where pre-leaded trays are used, the flashing is dressed directly over the roof surface as required. 5.6 If flashing is required for unleaded trays, the joint below the tray is raked out and the flashing inserted to extend under the tray by a minimum of 25 mm. Wedges are inserted above the tray to ensure good contact between it and the flashing. The joint is repointed and the flashing dressed over the roof surface. 5.7 Flashings may be lead, or any other soft metal covered by, and used in accordance with, a current BBA Certificate. Bibliography BS EN : 1999 Lead and lead alloys Rolled lead sheet for building purposes BS : 2005 Code of practice for the use of masonry Materials and components, design and workmanship BS 8215 : 1991 Code of practice for design and installation of damp-proof courses in masonry construction On behalf of the British Board of Agrément Date of issue: 26th March 2007 Chief Executive 3

14 British Board of Agrément Bucknalls Lane, Garston, Watford, Herts WD25 9BA Fax: website: For technical or additional information, contact the Certificate holder (see front page). For information about the Agrément Certificate, including validity and scope, tel: Hotline , or check the BBA website.