- Joined
- 8 Sep 2004
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I was after a warm pitched (lean-to) roof. But the cost of the insulation boards and breather membrane are just too expensive when all I need to cover is about 4 sqm of roof.
Then I found Screwfix's "Pitch Roofing Insulation" which are 105x400x1200mm insulation boards with integral water barrier membrane. The picture in the Screwfix magazine appears to show these boards placed between the rafters, so not the warm roof I wanted after all (105mm boards are a bit deep to stick on top of the rafters to create a warm roof).
But I am confused. If the all-in-one Screwfix boards have the equivalent of roofing felt stuck to the insulation boards, in a typical cold roof application I understood that ventilation would be required between the felt and the insulation within the rafters. So how do you think you are meant to ventilate the roof space with this product to prevent condensation?
Any clues, or anyone used these before?
Cheers
Then I found Screwfix's "Pitch Roofing Insulation" which are 105x400x1200mm insulation boards with integral water barrier membrane. The picture in the Screwfix magazine appears to show these boards placed between the rafters, so not the warm roof I wanted after all (105mm boards are a bit deep to stick on top of the rafters to create a warm roof).
But I am confused. If the all-in-one Screwfix boards have the equivalent of roofing felt stuck to the insulation boards, in a typical cold roof application I understood that ventilation would be required between the felt and the insulation within the rafters. So how do you think you are meant to ventilate the roof space with this product to prevent condensation?
Any clues, or anyone used these before?
Cheers