Electronic Copy Brett Martin Harcon Speedwell Industrial Estate Staveley Derbyshire S43 3JP Tel: 01246 280000 Fax: 01246 561111 e-mail: info@harcon.co.uk website: www.harcon.co.uk CI/SfB (52.5) In8 Agrément Certificate No 89/2153 Third issue* Designated by Government to issue European Technical Approvals HARCON GRP VALLEY TROUGH SECTIONS Produit d étanchéité pour toitures PRV Dachabdichtungen GFX Product Harcon GRP Valley Trough THIS CERTIFICATE RELATES TO HARCON GRP VALLEY TROUGH SECTIONS. Each product is for use in slated or tiled roofs constructed in accordance with the relevant requirements of BS 5534 : 2003. The products are for use to provide a weatherproof junction at changes of direction and materials. The products are manufactured and marketed by the Certificate holder. These Front Sheets must be read in conjunction with the accompanying Detail Sheets, which provide information to specific products. 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 roof waterproofing systems with the Building Regulations. In the opinion of the BBA, Harcon GRP Valley Trough Sections, if used in accordance with the provisions of this Certificate, will meet or contribute to meeting the relevant requirements. Requirement: B4(2) External fire spread Data obtained on tests to BS 476-3 : 1958, indicate that the use of the products will enable a roof to be unrestricted by this Requirement. See tinted areas of the Properties in relation to fire section of these Front Sheets. Requirement: C2(b) Resistance to moisture Tests for water resistance indicate that the products meet this Requirement. See the tinted area of the Weathertightness section of these Front Sheets. Requirement: Regulation 7 Materials and workmanship The products are acceptable materials. See the tinted area of 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 (www.bbacerts.co.uk) or contacting the BBA direct (Telephone Hotline 01923 665400).
Electronic Copy 2 The Building (Scotland) Regulations 2004 In the opinion of the BBA, Harcon GRP Valley Trough Sections, 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 of the Durability section of these Front Sheets and the Installation part of the accompanying Detail Sheets. Regulation: 9 Building standards construction Standard: 2.8 Spread from neighbouring buildings Data obtained from tests to BS 476-3 : 1958, indicate that the use of the products will enable a roof to be unrestricted under this Standard, with reference to clauses 2.8.1 (1)(2) and 2.8.2 (1)(2). See the tinted areas of the Properties in relation to fire section of these Front Sheets. Standard: 3.10 Precipitation Tests for water resistance indicate that the use of the products will enable a roof to satisfy the requirements of this Standard, with reference to clauses 3.10.1 (1)(2) and 3.10.6 (1)(2). See the tinted areas of the Weathertightness section of these Front Sheets. Regulation: 12 Building standards conversions All comments given for this product under Regulation 9, also apply to this Regulation with reference to clause 0.12.1 (1)(2) and Schedule 6 (1)(2). (1) Technical Handbook (Domestic). (2) Technical Handbook (Non-Domestic). 3 The Building Regulations (Northern Ireland) 2000 In the opinion of the BBA, Harcon GRP Valley Trough Sections, if used in accordance with the provisions of this Certificate, will satisfy or contribute to satisfying the various Building Regulations as listed below. Regulations: B2 Fitness of materials and workmanship The products are acceptable materials. See the tinted area of Durability section of these Front Sheets. Regulation: C4 Resistance to ground moisture and weather Tests for water resistance indicate that the use of the products can contribute towards enabling a roof to satisfy the requirements of this Regulation. See the tinted area of the Weathertightness section of these Front Sheets. Regulation: E5 External fire spread Data obtained from tests to BS 476-3 : 1958, indicate that the use of the products will enable a roof to be unrestricted under the requirements of this Regulation. See the tinted areas of the Properties in relation to fire 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: 1 Description (1.2) (of the relevant Detail Sheet). 2
Technical Specification 5 Delivery and site handling Harcon GRP Valley Trough Sections are delivered to site in packs of 10. Each item bears the BBA identification mark incorporating the number of this Certificate. Packs should be stored flat on a clean, level surface. Design Data 6 General 6.1 Harcon GRP Valley Trough Sections are suitable for use on slated/tiled roofs constructed in accordance with the relevant requirements of BS 5534 : 2003. 6.2 The sections should be cut to size with a finetoothed saw and can accept holes being drilled using a sharp drill bit. 7 Strength The products have adequate strength to resist impacts likely to occur during installation and use. 8 Weathertightness Test data confirm that the products will adequately resist the passage of moisture to the inside of the building and so meet the requirements of: England and Wales Approved Document C, Requirement C2(b) Section 6.0 Scotland Mandatory Standard 3.10 Northern Ireland Regulation C4. Electronic Copy 9 Properties in relation to fire 9.1 Samples of GRP, representative of that used in the manufacture of the products, when tested in accordance with BS 476-3 : 1958, achieved an EXT.S.AA rating. 9.2 Samples of GRP, representative of that used in the manufacture of the products, when tested in accordance with BS 476-7 : 1987, achieved a Class 3 surface spread of flame. 10 Maintenance Minimum maintenance is required and the smooth surface finish will inhibit the build-up of foreign matter. Damaged lengths can be replaced without having to remove adjacent lengths. 11 Durability Available test data and knowledge of the material suggest that the products, when installed in accordance with this Certificate, should have a life of at least 20 years. Bibliography BS 476-3 : 1958 Fire tests on building materials and structures External fire exposure roof test BS 476-7 : 1987 Fire tests on building materials and structures Method for classification of the surface spread of flame of products BS 5534 : 2003 Code of practice for slating and tiling (including shingles) 3
Conditions of Certification 12 Conditions 12.1 This Certificate: (a) relates only to the product that is named, described, installed, used and maintained as set out in this Certificate; (b) is granted only to the company, firm or person identified on the front cover no other company, firm or person may hold or claim any entitlement to this Certificate; (c) is valid only within the UK; (d) 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; (f) is subject to English law. 12.2 References in this Certificate to any Act of Parliament, Regulation made thereunder, Directive or Regulation of the European Union, Statutory Instrument, Code of Practice, British Standard, manufacturers instructions or similar publication, are references to such publication in the form in which it was current at the date of this Certificate. 12.3 This Certificate will remain valid for an unlimited period provided that the product and the manufacture and/or fabrication including all related and relevant processes thereof: (a) are maintained at or above the levels which have been assessed and found to be satisfactory by the BBA; (b) continue to be checked as and when deemed appropriate by the BBA under arrangements that it will determine; and Electronic Copy (c) are reviewed by the BBA as and when it considers appropriate. 12.4 In granting this Certificate, the BBA is not responsible for: (a) the presence or absence of any patent, intellectual property or similar rights subsisting in the product or any other product; (b) the right of the Certificate holder to market, supply, install or maintain the product; and (c) the actual works in which the product is installed, used and maintained, including the nature, design, methods and workmanship of such works. 12.5 Any recommendations relating to the use or installation of this product which are contained or referred to in this Certificate are the minimum standards required to be met when the product is used. They do 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 or in the future; nor is conformity with such recommendations to be taken as satisfying the requirements of the 1974 Act or of any present or future 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 installation and use of this product. In the opinion of the British Board of Agrément, Harcon GRP Valley Trough Sections are fit for their intended use provided they are installed, used and maintained as set out in this Certificate. Certificate No 89/2153 is accordingly awarded to Brett Martin Harcon. On behalf of the British Board of Agrément Date of Third issue: 23rd March 2006 Chief Executive *Original Certificate issued 2nd February 1989. This revised version includes change of Certificate holder s name, and contact numbers, reference to the revised Regulations and Standards, and new Conditions of Certification. British Board of Agrément P O Box No 195, Bucknalls Lane Garston, Watford, Herts WD25 9BA Fax: 01923 665301 2006 e-mail: mail@bba.star.co.uk website: www.bbacerts.co.uk For technical or additional information, contact the Certificate holder (see front page). For information about the Agrément Certificate, including validity and scope, tel: Hotline 01923 665400, or check the BBA website.
Electronic Copy CI/SfB (52.5) In8 Brett Martin Harcon HARCON GRP VALLEY TROUGHS TYPES A AND D Certificate No 89/2153 DETAIL SHEET 2 Third issue* Product THIS DETAIL SHEET RELATES TO HARCON GRP VALLEY TROUGHS TYPES A AND D, GRP VALLEY TROUGHS FOR USE ON TILED ROOFS. Tiled roofs must be constructed in accordance with the relevant requirements of BS 5534 : 2003. This Detail Sheet must be read in conjunction with the Front Sheets, which give the product s position regarding the Building Regulations, general information relating to the product, and the Conditions of Certification. Technical Specification Figure 2 Tile Valley Trough 1 Description 1.1 Harcon GRP Valley Troughs Types A and D are manufactured from glass-fibre/polyester laminates in a continuous process to the profiles shown in Figures 1 and 2. Sanded strips bonded along the upper surface of each edge provide a key for bedding the roof tiles in mortar. 1.2 The troughs are manufactured to the nominal specification: thickness (mm) 1.3 area weight (kgm 2 ) 1.83 width (mm) 360 (Type A) 410 (Type D) length (m) 1.8, 2.4, 3.0 sanded strip width (mm) 40 standard colour (1) grey/blue (1) Other colours are available to order. Figure 1 Harcon GRP Valley Troughs Types A and D 360 140 sanded strips type A 410 160 sanded strips type D all dimensions in mm 60 90 12 mm valley boards set between rafters on noggings or alternative continuous 6 mm board 1.3 The valley troughs are produced with an angle between the two sides of 17 and can be readily adapted by bending to accommodate roof pitches from 5 to 60. 1.4 Quality control checks are performed on incoming materials, during production and on the final product. Checks on the final product include: visual inspection weight dimensions. Installation valley trough tile valley 2 General Installation of Harcon GRP Valley Troughs Types A and D should be in accordance with the manufacturer s instructions and the relevant recommendations of BS 5534 : 2003 and BS 8000-6 : 1990. 3 Procedure 3.1 The use of valley boards, 12 mm boards supported on noggings between rafters or, Readers are advised to check the validity of this Detail Sheet by either referring to the BBA s website (www.bbacerts.co.uk) or contacting the BBA direct (Telephone Hotline 01923 665400).
alternatively, 6 mm boards laid over rafters, is recommended. Valley troughs can be installed without the use of valley boards provided the trough is pushed down snugly against the rafters and is drilled and nailed correctly. However, there is a greater risk of mortar bedding being loosened, and foot traffic must be avoided. A heavier weight X grade valley trough weighing 2.4 kgm 2 reducing the need for valley boards is also available. 3.2 The valley should be lined first longitudinally with reinforced underlay one metre wide. A length of the trough should be pressed to a snug fit into the valley and the line of the outer edges marked. The pitch angle of the valley trough, originally 17, will adapt to suit pitches from 5 to 60. 3.3 Counter battens of similar size to the roofing battens should be fixed along the marked line to support the edges of the trough, using nails of a quality acceptable in good roofing practice. 3.4 Commencing at the foot of the valley, troughs should be nailed at 400 mm spacings to the counter battens through drilled holes. 3.5 Consecutive lengths of valley trough should be laid allowing a 150 mm overlap at the joints, finally trimming at the head and foot of the valley using a fine-toothed saw. 3.6 The tiles should be bedded onto mortar laid on the sanded strips, keeping the water channels clear. Technical Investigations The following is a summary of the technical investigations carried out on Harcon GRP Valley Troughs Types A and D. 4 Tests Samples of the troughs and representative samples of the material were supplied by the manufacturer for testing. Tests were carried out in accordance with MOAT No 9 : 1973 to determine: resin/glass ratio dimensions Electronic Copy tensile strength/elongation cross-breaking strength effect of elevated temperatures effect of water impact resistance. 5 Investigations 5.1 The results of fire tests on samples of GRP used in the manufacture of the product, carried out in accordance with BS 476-3 : 1958 and BS 476-7 : 1987 by an independent test authority, were assessed. 5.2 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. 5.3 A visit was made to a site in progress to assess the practicability of installation. 5.4 A visit was made to an existing site to examine the performance of the product. Bibliography BS 476-3 : 1958 Fire tests on building materials and structures External fire exposure roof test BS 476-7 : 1987 Fire tests on building materials and structures Method for classification of the surface spread of flame of products BS 5534 : 2003 Code of practice for slating and tiling (including shingles) BS 8000-6 : 1990 Workmanship on building sites Code of practice for slating and tiling of roofs and claddings MOAT No 9 : 1973 Directive for the Assessment of Products in Glass-Reinforced Polyester for use in Building On behalf of the British Board of Agrément Date of Third issue: 23rd March 2006 Chief Executive *Original Detail Sheet issued 2nd February 1989. This revised version includes change of Certificate holder s name and reference to the revised Building Regulations and Standards. British Board of Agrément P O Box No 195, Bucknalls Lane Garston, Watford, Herts WD25 9BA Fax: 01923 665301 2006 e-mail: mail@bba.star.co.uk website: www.bbacerts.co.uk For technical or additional information, contact the Certificate holder (see front page). For information about the Agrément Certificate, including validity and scope, tel: Hotline 01923 665400, or check the BBA website.
Electronic Copy CI/SfB (52.5) In8 Brett Martin Harcon HARCON GRP SLATE VALLEY TROUGH TYPE B Certificate No 89/2153 DETAIL SHEET 3 Third issue* Product THIS DETAIL SHEET RELATES TO HARCON GRP SLATE VALLEY TROUGH TYPE B, A GRP SECTION FOR USE ON SLATED ROOFS. Slated roofs must be constructed in accordance with the relevant requirements of BS 5534 : 2003. This Detail Sheet must be read in conjunction with the Front Sheets, which give the product s position regarding the Building Regulations, general information relating to the product, and the Conditions of Certification. Technical Specification 1 Description 1.1 The Harcon GRP Slate Valley Trough Type B is manufactured from glass- fibre/polyester laminates in a continuous process to the profile shown in Figure 1. Figure 1 Harcon Trough Type B 19 50 115 305 valley trough 12 mm valley boards set between rafters on noggings or alternative continuous 6 mm board all dimensions in mm slate valley 1.2 The sections are manufactured to the nominal characteristics: thickness (mm) 1.3 weight (kgm 2 ) 1.83 width (mm) 305 length (m) 1.8, 2.4, 3.0 standard colour (1) grey/blue (1) Other colours are available to order. 1.3 The troughs are produced with an angle between the two sides of 17 and can be readily adapted by bending to accommodate roof pitches from 5 to 60. 1.4 Quality control checks are performed on incoming materials, during production and on the final product. Checks on the final product include: visual inspection weight dimensions. Installation 2 General Installation of Harcon GRP Slate Valley Trough Type B should be in accordance with the manufacturer s instructions and the relevant recommendations of BS 5534 : 2003 and BS 8000-6 : 1990. 3 Procedure 3.1 The use of valley boards, 12 mm boards supported on noggings between rafters or, alternatively, 6 mm boards laid over rafters, is recommended. Valley troughs can be installed without the use of valley boards provided the trough is pushed down snugly against the rafters and is drilled and nailed correctly. However, foot traffic must be avoided. A heavier weight X grade valley trough weighing 2.4 kgm 2 reducing the need for valley boards is also available. 3.2 The valley should be lined first longitudinally with reinforced underlay one metre wide. A length Readers are advised to check the validity of this Detail Sheet by either referring to the Index of Current BBA Publications or contacting the BBA direct (Telephone Hotline 01923 665400).
of the trough should be pressed to a snug fit into the valley and the line of the outer edges marked. The pitch angle of the valley trough, originally 17, will adapt to suit pitches from 5 to 60. 3.3 Counter battens of similar size to the roofing battens should be fixed along the marked line to support the edges of the trough, using nails of a quality acceptable in good roofing practice. 3.4 Commencing at the foot of the valley, troughs should be nailed at 400 mm spacings to the counter battens through drilled holes. 3.5 Consecutive lengths of valley trough should be laid allowing a 150 mm overlap at the joints, finally trimming the head and foot of the valley using a fine-toothed saw. Technical Investigations Electronic Copy 5 Investigations 5.1 The results of fire tests on samples of GRP used in the manufacture of the product, carried out in accordance with BS 476-3 : 1958 and BS 476-7 : 1987 by an independent test authority, were assessed. 5.2 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. Bibliography BS 476-3 : 1958 Fire tests on building materials and structures External fire exposure roof test BS 476-7 : 1987 Fire tests on building materials and structures Method for classification of the surface spread of flame of products The following is a summary of the technical investigations carried out on Harcon GRP Slate Valley Trough Type B. 4 Tests Samples of the slate valley trough sections, and representative samples of the material were supplied by the manufacturer for testing. Tests were carried out in accordance with MOAT No 9 : 1973 to determine: density resin/glass ratio dimensions tensile strength/elongation cross-breaking strength effect of elevated temperatures effect of water soak impact resistance. BS 5534 : 2003 Code of practice for slating and tiling (including shingles) BS 8000-6 : 1990 Workmanship on building sites Code of practice for slating and tiling of roofs and claddings MOAT No 9 : 1973 Directive for the Assessment of Products in Glass-Reinforced Polyester for use in Building On behalf of the British Board of Agrément Date of Third issue: 23rd March 2006 Chief Executive *Original Detail Sheet issued 2nd February 1989. This revised version includes change of company name, reference to the revised Building Regulations and associated text. British Board of Agrément P O Box No 195, Bucknalls Lane Garston, Watford, Herts WD25 9BA Fax: 01923 665301 2006 e-mail: mail@bba.star.co.uk website: www.bbacerts.co.uk For technical or additional information, contact the Certificate holder (see front page). For information about the Agrément Certificate, including validity and scope, tel: Hotline 01923 665400, or check the BBA website.
Electronic Copy CI/SfB (52.5) In8 Brett Martin Harcon HARCON GRP SECRET GUTTER TYPE C Certificate No 89/2153 DETAIL SHEET 4 Third issue* Product THIS DETAIL SHEET RELATES TO HARCON GRP SECRET GUTTER TYPE C, A GRP BONDING GUTTER FOR USE AS A SEAL AT THE JUNCTION OF OLD AND NEW ROOFS ON TERRACED, SEMI- DETACHED OR EXTENDED HOUSES. Roofs must be constructed in accordance with the relevant requirements of BS 5534 : 2003. This Detail Sheet must be read in conjunction with the Front Sheets, which give the product s position regarding the Building Regulations, general information relating to the product, and the Conditions of Certification. Technical Specification 1 Description 1.1 Harcon GRP Secret Gutter Type C sections are manufactured from glass-fibre/polyester laminate in a continuous process to the profile illustrated (see Figure 1) with a sanded strip bonded along the centre line of the upper surface to provide a key for bedding the roof tiles/slates in mortar. 1.3 Quality control checks are performed on incoming materials, during production and on the final product. Checks on the final product include: visual inspections weight dimensions. Installation Figure 1 Secret Gutter Type C 260 mm sanded strip 2 General Installation of Harcon GRP Secret Gutter Type C should be in accordance with the manufacturer s instructions and the relevant recommendations of BS 5534 : 2003 and BS 8000-6 : 1990. 40 mm secret gutter 1.2 The sections are manufactured to the nominal characteristics: thickness (mm) 1.1 area weight (kgm 2 ) 1.5 total width (mm) 260 length (m) 1.8, 2.4, 3.0 sanded strip width (mm) 40 standard colour (1) grey/blue (1) Other colours are available to order. 3 Procedure 3.1 The underlay and battens over the joint area of the separating-wall should be made good. Battens may cross over the separating-wall without trimming. 3.2 The adjoining roof should be prepared by renewing any nails in the first 130 mm, and cutting the tiles or slates in the straight line mid-way over the separating-wall. 3.3 The gutter should be slid under undisturbed tiles or slates, approximately 115 mm, and nailed to the battens through drilled holes using nails of a quality acceptable to good roofing practice. 3.4 Consecutive lengths of valley trough should be laid allowing a 150 mm overlap at the joints and extending over the fascia board into the gutter. 3.5 The tiles or slates should then be fixed with a butt joint over the centre of the trough and bedded onto mortar or mastic laid on the sanded strip. The water channels must be left free from mortar or mastic. Readers are advised to check the validity of this Detail Sheet by either referring to the BBA s website (www.bbacerts.co.uk) or contacting the BBA direct (Telephone Hotline 01923 665400).
Technical Investigations Electronic Copy Bibliography The following is a summary of the technical investigations carried out on Harcon GRP Secret Gutter Type C sections. 4 Tests Samples of the gutter and samples of the material, were supplied by the manufacturer for testing. Tests were carried out in accordance with MOAT No 9 : 1973 to determine: density resin/glass ratio dimensions tensile strength/elongation cross-breaking strength effect of elevated temperatures effect of water soak impact resistance. BS 476-3 : 1958 Fire tests on building materials and structures External fire exposure roof test BS 476-7 : 1987 Fire tests on building materials and structures Method for classification of the surface spread of flame of products BS 5534 : 2003 Code of practice for slating and tiling (including shingles) BS 8000-6 : 1990 Workmanship on building sites Code of practice for slating and tiling of roofs and claddings MOAT No 9 : 1973 Directive for the Assessment of Products in Glass-Reinforced Polyester for use in Building 5 Investigations 5.1 The results of fire tests on samples of GRP used in the manufacture of the product, carried out in accordance with BS 476-3 : 1958 and BS 476-7 : 1987 by an independent test authority, were assessed. 5.2 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. On behalf of the British Board of Agrément Date of Third issue: 23rd March 2006 Chief Executive *Original Detail Sheet issued 2nd February 1989. This revised version includes change of Certificate holder s name, and reference to the revised Building Regulations and Standards. British Board of Agrément P O Box No 195, Bucknalls Lane Garston, Watford, Herts WD25 9BA Fax: 01923 665301 2006 e-mail: mail@bba.star.co.uk website: www.bbacerts.co.uk For technical or additional information, contact the Certificate holder (see front page). For information about the Agrément Certificate, including validity and scope, tel: Hotline 01923 665400, or check the BBA website.
Electronic Copy CI/SfB (52.5) In8 Brett Martin Harcon HARCON GRP DRY VALLEY TROUGHS TYPES DVA AND DVB Certificate No 89/2153 DETAIL SHEET 5 Product THIS DETAIL SHEET RELATES TO HARCON GRP DRY VALLEY TROUGHS TYPES DVA AND DVB, GRP VALLEY TROUGHS FOR USE ON TILED ROOFS. Tiled roofs must be constructed in accordance with the relevant requirements of BS 5534 : 2003. This Detail Sheet must be read in conjunction with the Front Sheets, which give the product s position regarding the Building Regulations, general information relating to the product, and the Conditions of Certification. Technical Specification Figure 1 Harcon GRP Dry Valley Troughs 1 Description 1.1 Harcon GRP Dry Valley Troughs Types DVA and DVB are manufactured from glass-fibre/ polyester laminates in a continuous process to the profiles shown in Figures 1 and 2. 60 330 44 1.2 The troughs are manufactured to the nominal specification: thickness (mm) 1.3 area weight (kgm 2 ) 1.64 width (mm) 330 (Type DVA) 355 (Type DVB) length (m) 1.8, 2.4, 3.0 standard colour (1) grey/blue (1) Other colours are available to order. 1.3 The valley troughs are produced at an angle and can be readily adapted by bending to accommodate roof pitches from 20 to 65. 1.4 Quality control checks are performed on incoming materials, during production and on the final product. Checks on the final product include: visual inspection weight dimensions. DVA shallow dr y fix valley (all dimensions in mm) 355 60 60 DVB deep dr y fix valley Figure 2 Dry Valley Trough Types DVA and DVB dry fix valley trough valley board Readers are advised to check the validity of this Detail Sheet by either referring to the BBA s website (www.bbacerts.co.uk) or contacting the BBA direct (Telephone Hotline 01923 665400).
Installation Electronic Copy Technical Investigations 2 General Installation of Harcon GRP Dry Valley Troughs Types DVA and DVB should be in accordance with the manufacturer s instructions and the relevant recommendations of BS 5534 : 2003 and BS 8000-6 : 1990. 3 Procedure 3.1 The use of valley boards, 12 mm boards supported on noggings between rafters or, alternatively, 6 mm boards laid over rafters, is recommended. 3.2 The valley should be lined first longitudinally with reinforced underlay one metre wide. 3.3 Counter battens of similar size to the roofing battens to support the edge of the trough, should be fixed at the correct distance from the centre of the valley (varying according to roof pitch) using nails of a quality acceptable in good roofing practice. Ensure that the roof tile underlay is laid over the counter battens before fitting the tiling battens. The ends of the tiling battens should be firmly secured to the valley boards. 3.4 A section in the fascia board should be cut to allow the valley to run straight into the gutter without having to bend up over it. 3.5 A V shape should then be cut out at the end of the valley to fit neatly into the gutter. 3.6 Position the Dry Valley Trough by locating firmly between the counter battens. The eaves filler is located at the tail of any run to close the cavity and can be trimmed to suit, if necessary. 3.7 Fix the Dry Valley Trough by nailing at 400 mm centres. 3.8 Consecutive lengths of Dry Valley Troughs should be laid allowing a 150 mm overlap at the joints, finally trimming at the head and foot of the valley using a fine-toothed saw. 3.9 The tiles should be laid in accordance with the manufacturer s instructions. The following is a summary of the technical investigations carried out on Harcon GRP Dry Valley Troughs Types DVA and DVB. 4 Tests Samples of the troughs and representative samples of the material were supplied by the manufacturer for testing. Tests were carried out in accordance with MOAT No 9 : 1973 to determine: resin/glass ratio dimensions tensile strength/elongation cross-breaking strength effect of elevated temperatures effect of water impact resistance. 5 Investigations 5.1 The results of fire tests on samples of GRP used in the manufacture of the product, carried out in accordance with BS 476-3 : 2004 and BS 476-7 : 1987 by an independent test authority, were assessed. 5.2 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. 2
Bibliography BS 476-3 : 2004 Fire tests on building materials and structures Classification and method of test for external fire exposure to roofs BS 476-7 : 1987 Fire tests on building materials and structures Method for classification of the surface spread of flame of products BS 5534 : 2003 Code of practice for slating and tiling (including shingles) Electronic Copy BS 8000-6 : 1990 Workmanship on building sites Code of practice for slating and tiling of roofs and claddings MOAT No 9 : 1973 Directive for the Assessment of Products in Glass-Reinforced Polyester for use in Building On behalf of the British Board of Agrément Date of issue: 23rd March 2006 Chief Executive 3
Electronic Copy British Board of Agrément P O Box No 195, Bucknalls Lane Garston, Watford, Herts WD25 9BA Fax: 01923 665301 2006 e-mail: mail@bba.star.co.uk website: www.bbacerts.co.uk For technical or additional information, contact the Certificate holder (see front page). For information about the Agrément Certificate, including validity and scope, tel: Hotline 01923 665400, or check the BBA website.