SLE Cladding Limited

For further information please contact SLE Cladding Ltd. Tel. 01948 666 321. Fax. 01948 66 55 32

COMPLETE MANUFACTURER'S FIXING GUIDE

The covering of new or existing roofs is a specialist operation and should be carried out with due regard to Health & Safety Regulations. When fixing the Onduline system over insulated or pitched roof construction, the tile or slate manufacturer should be consulted to verify the systems compatibility. All works should be conducted in accordance with relevant European and British Standards should Laying and fixing procedures. The Ondutile system is designed to allow the tiles to be laid in accordance with the manufacturers recommendations. Normal laying and fixing techniques and practice should therefore be followed at all times unless otherwise stated Fix sheets with a single corrugation side lap, and 200mm end lap. Fixings must only penetrate the top of sheet corrugations. Start alternate courses with sheet cut in half vertically to create a broken bond sheet pattern, avoid 4 ply material build up on end laps
	Above: Eaves fixing for Type A specification.
	The inherent flexibility of Onduline allows it to be bent upwards at the eaves to reduce the distance between the water shed points from the eaves tray and tile. Therefore use a full tile at the facia to ascertain correct eves tile rake, and facia height. Allow a maximum of 30mm tile overhang from facia line. Construct eaves detail using a tilting fillet or batten support to 12 mm plywood base and fix Ondutile eaves tray. This has integral fold lines, which are bent down to form a permanent drip edge into the gutter. Butyl tape can be used to seal the eaves tray laps. Onduline sheets are then laid flush with the facia line, and nailed through the tile battens into the support battens. Fix ventilator strip to the eaves batten and overlay with Ondutile batten cloak piece. Use deepflow gutter to reduce the risk of rainwater overshooting the gutter.
Above Eaves fixing for Type B specification


Fig. 1 Verge Detail. Onduline can be used with wet or dry verge systems. The wet system Illustrated, uses 150mm undercloak and timber barge boards. Ondutile can also be fixed on to brick verges by laying the Onduline sheets and support battens onto the inner block course. The outer brickwork course is then laid level with the top of the Onduline corrugation. A DPC is then dressed from the outer course onto the Onduline sheet. Tile battens and undercloak can now be fixed and the tiles laid in accordance with manufacturers instructions	Fig. 2 End wall abutment. Use Ondutiss improved roofing felt to form a felt apron flashing from the top of the Onduline sheet to wall upstand, behind the line of the primary flashing. The tile battens and tiles can then be fixed and the primary two-part tile flashing can be applied, dressed into the wall. Abutment ventilator systems can be used by providing additional support below the Onduline allowing the ventilator channel to be laid directly on to the Onduline sheet and fixed in accordance with the manufacturer's instructions.	Fig. 3 Side wall abutment. Form Ondutiss felt flashing on top of the Onduline sheet providing 3 corrugation cover and dress up the wall behind the line of primary flashings, and secure with tile battens. The sidewall abutment is then finished with a conventional two part wall abutment flashing.

Fig. 4 Ridge and hip detail. At ridge and hips, lay Ondutiss roofing felt across the butt joint in the Onduline sheets and dress down a minimum of 300mm either side of the ridge. When using ventilation products, the Ondutiss cover can be cut and trimmed to suit the manufacturers fixing requirements.	Fig. 5 Valley details for Type A specification. Lay valley boards allowing for greater width due to the increased depth of finished roof. Fix trimming battens (C) to support batten (A) up line of valley. Valley lining can then be laid. Cut and fix Onduline sheets, overlay with upper trimming battens (D) and tile battens (B). Fix ventilator comb and undercloak. The tiles can then be cut and laid on a mortar bed in accordance with manufacturers instructions.	Fig. 6 Valley detail for Type B specification. Lay tilting fillet to decking up line of valley. Allow for a wider valley width due to increased depth of finished roof. Valley lining can then be laid. Cut and fix Onduline sheets. Overlay with tile battens (B) and trimming batten (D) up line of valley. Fix ventilator and undercloak. Cut and lay tiles on mortar bed in accordance with manufacturers instructions. On exposed sites, to increase depth of mortar bed to tiles, fix undercloak below trimming/tile battens (E). Ventilator comb can be replaced by woven plastic ventilation mat laid below Onduline corrugations to provide additional weather-proofing.

Fig. 7 Change of pitch from conventional to Ondutile roof. Fix support battens and Onduline sheets on lower shallow pitched roof. Lay tilting fillet from upper steep pitched roof to finished height of tile course on lower roof (allow space for tile fixing). Overlay Onduline with Ondutiss felt and dress up over tilting fillet and under felt from upper roof. Fix tiles to lower roof and lay lead apron flashing to LDA specifications. Finally dress felt from upper roof over lead apron. Tiles can then be laid on upper roof.	Fig. 8 Roof light. Fix roof light on raised timber curbs, level with top of Onduline sheets. Rooflight flashings are used to weather the unit. Form 300mm lap joint in the Onduline sheet to rear of line of back gutter (E) and insert closure flashing (Onduline Apron Flashing) (F) laid on bed of sealant adhesive. Fix 12mm plywood base for back gutter and tilting fillet and dress down gutter lining. Tiles can then be fixed and flashed in accordance with manufacturer's instructions.	Fig. 9 Tile ventilator detail. Position ventilator between tile battens and cut neat hole in the Onduline (and decking on plain tile applications). Ventilator socket can then be fitted. Protect rear from water ingress by dressing felt down from under abutment flashing between tile battens and Onduline. Felt is then folded back to form a welt to divert water to corrugations. Soil vent pipes are weathered using proprietary flashing plates and collars in accordance with manufacturer's instructions. Secondary collars can be formed if necessary by creating a back gutter as described in Fig. 8.

Fig. 10 Corrugation support. Situations arise when fixing Ondutile such as curved bays or steep roof pitches where additional support is required to the Onduline corrugation. In these cases rounded timber inserts are used below the Onduline corrugations on every fifth course. They should not be used as fixing points as the section is insufficient to avoid timber splitting.	Guarantee. The Ondutile system is guaranteed to remain weatherproof for 30 years, when fixed in strict accordance with the manufacturer's fixing instructions. The guarantee is limited to the cost of Onduline materials only, and does not extend to the cost of labour or to primary tile/slate roof covering.