16. 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.
NOTE: Be aware there is more than one type of ridge ventilation system.
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D ridge vent filler 
Universal ridge ventilator
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17. Preparation Of The Top Course Of Tiles
When you have cut and bent the tile you may find there is some natural distortion in the tile and it may look like the tile won’t fit. This is perfectly normal. There is a standard procedure for removing any distortion. If this procedure is followed, installation is simple. If not followed it will be difficult to achieve a good fit.
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Step 1: Do not try to squash the tile into position at this stage (wait until you have completed step 4).
Locate front corner of tile into the interlocking profile of tile below and nail this corner into position. 
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Step 2: Locate rear corner of tile into interlock of adjoining tile and nail this corner into position as appropriate. 
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Step 3: Locate other front corner of tile into interlock of tile below and nail this corner into position. 
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Step 4: locate remaining rear corner of tile into position and nail as appropriate. 
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Step 5: Push front edge of tile into position and work your way into the middle nailing as you go. |
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18. 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. |
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19. Ridge Course D Ridge (Unventilated)
Fit two tile battens either side of ridge. Fix additional 50mm x 25mm batten to suit D Ridge on top of rear of the two tile battens.
Lay top course of tiles with back turned up 38mm.
Tips on cutting and bending tiles
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20. Ridge Course D Ridge With D Ridge Vent Filler
D ridge vent filler Cut underlay short of ridge line and fit two tile battens either side of ridge, leaving a sufficient gap for ventilation.
Lay top course of tiles with back turned up 38mm. Using a D Ridge as a guide, fit 50mm x 25mm battens and ridge vent filler units either side of ridge and fix through high point of tiles at laps and two in between the laps (see fixing instructions with ventilation pack).
Tips on cutting and bending tiles
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21. 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.
Fix additional tile batten to suit ridge on top of rear of the two tile battens.
Lay top course of tiles with back turned up 38mm against top tile batten.
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
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22. 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).
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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 |
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Vented with a D Ridge Vent Filler*
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
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24. Top Edge Abutment
Unvented
Turn the tile (or a Decra Top course flashing) and the roofing underlay 75mm up the abutment wall and cover over with a lead flashing Tips on cutting and bending tiles
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Vented with a D Ridge Vent Filler
(When fitting the two tile battens at the top remember to leave a sufficient gap for ventilation) |
25. 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
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Part 4 of the Decra Classic Tile Installation Guide covers Hips & Valleys Tips on cutting and bending tiles
Decra Tool Assembly Instructions |