Lay top course of underlay from one side of ridge over apex to overlap top course at other side by not less than 150mm.
Fix finishing courses of tops tiles. Lay ridge tiles by continuously bedding at edges and solidly bedding with tile slips inserted into mortar at joints between ridges.
Where masonry walls support or abut ridge, all ridge tiles within 900mm of such walls must be mechanically secured. Fix to supplementary ridge tile fixing batten with nails, clips or wire, etc, as recommended by manufacturer.
Fill ends of ridges at gables with mortar and slips of tiles finished flush.
Bedded Monopitch ridge
Dry Fix Ridge
Ridge with tileline ridgeroll ventilation
This system is suitable for all Dreadnought ridge tiles except capped angle ridges and is quick and easy to install. It is now mandatory, with the introduction of the new British Standard BS 5534, to mechanically fix all ridge tiles whether they are used on the ridge or or the hip line. The ridgeroll product comes in 6m boxes and consists of a corrugated grey coated aluminium roll which is laid out centrally on the ridge and temporarily fixed with double-sided adhesive tape. The ridge tiles are then laid over the top securing the roll in place leaving 10mm joints between each ridge. A cleat is then placed over the joint between the ridge tiles and screwed down into the ridge board.
For ornamental ridges, a butterfly clip is used to attach on to the ridge tiles and provide a fixing that can be screwed into the roof timber