Decra's Training Officer Peter Gibson guides you through the installation process for the Decra Plus Tile

15. Ridge Course D Ridge
The correct way to install the top course of tiles and the ridge tiles is dictated by whether you are trying to achieve an unventilated or ventilated ridge detail. 
 

 
 
Universal ridge ventilator

16. Ridge Course Nailing & Lapping D Ridges
The ridge caps have a slight taper in their design. Place the wider end of the ridge over the narrower end of the ridge beneath creating an 80mm overlap.
Each ridge should be secured with 4 nails on each side of the ridge cap.

17. Ridge Course D Ridge (Unventilated)
Fit two tile battens either side of ridge. Fit two tile battens either side of ridge.

Cut top tiles to suit (leaving a 10mm gap between the top cut edge of the tile and the top cut edge of the tile on the other side of the ridgeline).

Fix additional 50mm x 25mm batten to suit D Ridge on top of the tiles, taking care to sandwich the D Ridge Sealing Strip between the batten and the tile.
 
Tips on cutting and bending tiles
 

18. Ridge Course D Ridge With Universal D Ridge Vent

Universal ridge ventilator

Cut underlay short of ridge line and fit two tile battens either side of ridge, leaving a sufficient gap for ventilation.

Fit two tile battens either side of ridge.

Cut top tiles to suit (leaving a 10mm gap between the top cut edge of the tile and the top cut edge of the tile on the other side of the ridgeline).

Fix additional 50mm x 25mm batten to suit D Ridge on top of the tiles, taking care to sandwich the D Ridge Sealing Strip between the batten and the tile.

Place ridge cap into position over the top batten and the upstand edge of tile. Pull bottom edge of ridge cap away from the upstand edge of tiles and slip Universal 'D' ridge/hip ventilators into position on each side of the 'D' ridge cap. Ventilators should run continuously along each side of the ridge cap.

The ridge cap and ventilator to be nailed through the downturn of the ridge cap into the face of the batten, using four Decra fixing nails on each side.
Tips on cutting and bending tiles

19. D Ridge Ends Caps
 
1. Snip and fold out flap to suit choice of verge/barge cover.
2. Trim edge of flap to create a vertical plumbline when fitted.
3. Install D Ridges over end of D Ridge End Cap ensuring good tight lap occurs. Then nail D Ridge End Cap into position (Fix vertical end of D Ridge End Cap first).

23. Mono-Pitch D Ridge
Mono-pitch ridge caps can be formed by adjusting the angles of Decra’s standard D Ridge cap.

The procedure for installing the monopitch ridge is essentially the same as the detail for the ridges (please refer to ridge instruction shown earlier in this guide).      

Unvented

Vented using a Universal D Ridge Vent*

*When fitting the two tile battens at the top remember to leave a sufficient gap for ventilation

* When fitting the D ridge ensure that a gap of at least 5mm is maintained between the underside of the ridge and the topmost batten
Tips on cutting and bending tiles

24. Top Edge Abutment

Unvented
Turn roofing underlay 75mm up the abutment wall.
Cut top tiles to suit.

Fix additional 50mm x 25mm batten to suit Decra Top Course flashing on top of the tiles, taking care to sandwich the sealing strip between the batten and the tile.

Cover over with a lead flashing
Tips on cutting and bending tiles
             

Vented with a Universal D Ridge Vent Filler
An appropriate top course flashing for use with Decra’s Universal D ridge ventilator can be formed using a Decra Top Course flashing (by adjusting its downturned edge) or alternatively by adjusting the angles of a standard Decra D Ridge cap.

When fitting the top course flashing ensure that a gap of at least 5mm is maintained between the underside of the top course flashing and the topmost batten.

22. Side Edge Abutment
Turn the tile and roofing underlay 75mm up the abutment wall and cover over with a lead flashing.
         
Tips on cutting and bending tiles