Boldroll
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BOLDROLL® General specication to be used in conjunction with Britmet Tileform 0.9mm Boldroll roong sheets. Listed in order of xing HANDLING AND STORAGE Materials should be unloaded as close as possible to the building where they are to be installed. On site, packs should be stored on a rm, dry base away from the possibility of damage. Sheeting packs should be laid on pallets or bearers to allow ground clearance. Bearers at least 100mm x 50mm should be arranged at the same centres under each pack, which must not exceed 2 packs high and must slope sufciently to allow any rainwater which penetrates to drain away. A tarpaulin should cover the stacks not touching the surface of the sheets, this allows for circulation of air. To prevent damage to the coating on installation, the sheets must be lifted not dragged from the pack. Damage to the surface coating can be repaired with touch up paint. (Supplied by Britmet Tileform Ltd.) 1. EAVES DRIP FLASHING Supply and t Britmet Tileform eaves drip ashing. Manufactured and coated in identical material to main roof covering. To be a minimum girth of 140mm, once bent, xed with secondary xings and butt jointed. (Manufactured length – 2m) 2. UNDERLAY Supply and t Tyvek 2001 B pro breather membrane by Klober or similar approved. Laid horizontally across purlins, on top of and ush with the front edge of the Britmet Tileform eaves drip, all to manufacturers instructions. Note: if the purlin centres are greater than 900mm, lattice support wires should be used to eliminate the sagging of the breather membrane. 3. PURLINS & RAFTERS Size and centres to be designed to suit Britmet Tileform roong sheets. 8. BARGE / MONO RIDGE FLASHING To be manufactured and coated in identical material to main roof covering. Minimum girth of 340mm, three times bent, butt jointed with 50mm understrip or lapped 50mm. Manufactured length – 2m Fixings to be placed at 3no. per side. 9. VALLEY FLASHING To be manufactured and coated in identical material to main roof covering. Minimum girth of 420mm, three times bent, butt jointed with 50mm understrip or lapped 50mm. Manufactured length – 2m Fixings to be placed at 3no. per side. For roof pitches of 10° or below, valley details should be sealed using compriband expanding foam (B52 25mm x 10mm x 4m). 10. PIPE FLASHING All standard vent pipes to be nished with Dektite pipe ashing (Supplied by Britmet Tileform Ltd.) 11. UPSTAND / APRON FLASHING Manufactured and coated in identical material to main roof covering. Upstand – minimum girth 350mm, twice bent Apron – minimum girth 300mm, three times bent Butt jointed with 50mm understrip or lapped 50mm. Manufactured length – 2m. Fixings to be placed at 3no. per side. 12. SPECIAL FLASHING All chimneys, vents and special ashings, non-standard dimensions. Manufactured and coated in identical material to main roof covering or as required by the client. Note: for timber purlins – the Tek fastener must have a min. of 38mm penetration. Note: steel & zed purlins – should be a min. gauge of 1.25mm. 13. FLASHING END CAPS For ridge, barge and hips. Manufactured and coated in identical material to main roof covering. 4. ROOF COVERING All roof sheets to be manufactured by Britmet Tileform Limited. 14. PLASTIC COMB FILLERS: RIDGE, EAVES, HIP AND VALLEY For ridge and hip details, to be Tek screwed to the sheet. All 0.9mm Boldroll galvanised steel sheets are coated using a pigmented mineral lled acrylic coating, available in six standard colours. For eaves and valley details, to be Tek screwed to ashing. Note: All sheets MUST be laid from right to left. Note: the rst sheet must be laid so that its left-hand edge is perpendicular to the eave. All sheets should be laid full length ridge to eaves where possible and securely xed to the substructure. Note: where an end/head lap is to be used, for a roof pitch of 10° or more – allow a minimum lap of 75mm on the eaves sheet. For a roof pitch of 9° or less – allow a minimum lap of 300mm on the eaves sheet. Lapping requirements: lapping to be undertaken over supported areas only and all sheets must be mitred. 5. FIXINGS 5a Main sheet xings. To be xed through the crown of the prole using Tek screws, cap colour to suit. Fixings to be placed at 2no. per sheet, per purlin, with the exception of the eaves and ridge purlins which shall be placed at 3no. 5b Side lap stitching. Supplied by Britmet Tileform Ltd. Note: for roof void ventilation at the eaves, use either soft ventilation or the over fascia ventilating system, OFVS supplied by Britmet Tileform Limited. For duo roof pitches greater than 15° – OFVS 10 For duo roof pitches less than 15° – OFVS 25 15. SEALANT All sealant for side laps to be butyl mastic bead, code IDL 0303, grey or black. Pitches greater than 9° – minimum mastic bead diameter 6mm Pitches less than 10° – minimum mastic bead diameter 10mm Supplied by Britmet Tileform Limited. 16. COMPLETION All work to be inspected upon completion and any damaged work to be replaced. All debris to be completely cleared from the roof area prior to the removal of the scaffolding. Stitching screws to be placed every third tile for roof pitches of 10° or more. For roof pitches of less than 10°, they should be placed every second tile. Please note: This information is to be used as a guide only. It assumes that the structure of the existing building is in accordance with the building practice. Tek screws supplied by Britmet Tileform Limited. (These quantities may vary due to wind loading or other factors) At your request a custom specication can be written for your individual project. Please contact our technical department at the address shown below. Note: for coastal areas, stainless steel Tek screws must be used. 6. FIXING All holes in the sheet must be drilled (not punched). All cutting must be made by a 110-volt nibbler or jigsaw, and take place on the ground or away from the material already xed. COLOURS AVAILABLE Charcoal, Tudor Brown, Mid Grey, Antique Red, Terracotta and Sage Green. All on site cutting to be immediately treated with Firtan, an anti-corrosive material, or touch up kit, provided by roof sheet manufacturer. Note: After cutting, all swarf must be removed from the roof immediately. 7. RIDGE / HIP FLASHING To be manufactured and coated in identical material to main roof covering. Minimum girth of 400mm, ve times bent, butt jointed with 50mm understrip or lapped 50mm. (Manufactured length – 2m). Fixings to be placed at 3no. per side. For roof pitches of 10° or below, hip details should be sealed using compriband expanding foam (B52 25mm x 10mm x 4m). Manufacturers of light weight roong systems Britmet Tileform Ltd, Spital Farm Ofces, Thorpe Mead, Banbury, Oxon. OX16 4RZ Tel: 01295 250998 Fax: 01295 271068 Email: sales@britmet.co.uk www.Britmet.co.uk BRITMET TILEFORM LIMITED