SLE Cladding Limited

For further information please contact SLE Cladding Ltd. Tel. 01948 666 321. Fax. 01948 66 55 32 Felt Roofing
Coldseal and Quicktrim
Self-adhesive roofing system
Page 13
Traditional edge detailing.

Check Kerbs	Additional materials required for
	traditional detailing
Timber kerbs installed along an edge of a roof to prevent water running off at that edge and to encourage water to run only towards the gutter/drip edge (see Fig. 15) Upstands The point of a roof where a deck meets a vertical surface such as a wall. The internal angle should be filled with an angle fillet. The roofing felt must always be dressed or taken up the vertical surface by at least 150mm above the roofing surface. The membrane is usually fixed into a chase or underneath a flashing ( see Fig. 14). Welted drip/ gutter edge. The drip/gutter edge is the point on the roof where water runs off into the gutter. The welted drip is formed out of Coldseal Top Sheet, timber battens and hardboard strips. It is designed to ensure the effective run-off of water without the water running down the wall (see Fig. 17).	Galvanised Clout Nails. Clout nails should be 19mm long with extra large heads, and calculated on the basis of twenty one nails per linear metreage run of roof at the kerbs and gutter edges. Hardboard formers. Width of hardboard strip should be 75mm. Angle Fillet. Timber angle fillets can be bought already cut to a triangular section, 75mm x 75mm. Drip Battens. Lengths of timber approx, 50mm x 25mm. Fitting fillets and battens These are used to provide check kerbs along roof edges that will prevent water run-off and direct water to the drip/ gutter edge. Use 75mm x 50mm timber for battens and 75mm x 75mm triangular section timber for fillets. Fit angle fillets to all upstands and check kerbs as required. Fit drip battens, as illustrated previously, along all edges (gutter and check kerbs etc) The batten should be flush with the top of the facia board with the 25mm edge uppermost. Cut hardboard formers. Cut hardboard formers to length of gutter/ drip edge, and prime with Ruberoid SA Primer.

Page 14	Page 14
The gutter/drip edges	Lapping of welts
	With all the strips across the length of the gutter. drip edge in place, hanging down like a curtain off this edge, take the primed hardboard formers and nail them, using the large head clout nails, to the drip batten, so that the Top Sheet strips are sandwiched between the hardboard former and the drip edged batten. The selvedge edge Along one edge, on the top (green slate mineral) surface of Coldseal Top Sheet, is a strip of release paper covering a self-adhesive strip. (This selvedge edge is for overlapping and sticking one piece of Top Sheet to another to form a weather tight seal). You should always ensure that the selvedge is on the side where your next piece of Top Sheet is to be applied. Fold over welts Remove the remainder of the release paper from the self- adhesive underside of the Top Sheet and draw the Top Sheet up over the hardboard former and onto the roof to stick to the Underlay that is already in place. At the point where these Top Sheets meet the the kerb areas, the Top Sheet should be cut to avoid creases and folds (see page 15) Fold over welts Remove the remainder of the release paper from the self-adhesive underside of the Top Sheet and draw the Top Sheet up over the hardboard former and onto the roof to stick to the Underlay that is already in place. At the point where these Top Sheet strips meet the kerb areas, the Top Sheet should be cut to avoid creases and folds (see page 15). *Note The portion of the Top Sheet strip that is on the roof will be covered by a further strip of Top Sheet, detailed in later steps, to form a tough, watertight seal.* Kerb edges Finishing the kerb edges is the same procedure as making the welted edges on the gutter/drip edge, but the finishing sheet will need to be bonded to the slate green surface with lap mastic (see Step 4, Fig. 12)
Measuring the gutter edge
*N.B. When using traditional detailing, remember to allow for additional quantity of sheet when purchasing (open perimeter x 0.3m* These strips will form the welted drip edge at the lowest point of the roof i.e. where rainwater will be required to run off the roof into a gutter. The width measurement of the Top Sheet strips required will be twice the width of the hardboard former plus a minimum of 150mm to go back onto the roof. The length of strips is determined by the length of the drip edge with an allowance for overlaps. First, cut sufficient strips to accommodate the length of roof. Nail the Top Sheet Strips Next, starting from one end of the roof and working along the drip edge, carefully nail, using clout nails, the first strip of Top Sheet to the drip batten, with release paper peeled back slightly to expose the self-adhesive underside of the Top Sheet. The top edge of the Top Sheet should be flush with the top of the drip batten and the remainder of the strip is hanging down with the self-adhesive side facing away from the roof and the slate green mineral side facing the building. For the moment leave all release paper in position only peeling back sufficient to expose enough of the self-adhesive side to nail onto the drip batten.

		Next web page. Welted drip at eaves or verge drawings.

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