In the sample plans which come with The Complete Self Build Garden Room Guide, we suggest you use a warm roof build-up for your garden room. This system has become very popular, not only in garden room design but in the construction industry as a whole. It’s popular because the roof space does not need to be ventilated in the way a cold roof build-up does.
With a warm roof build-up, you position a sandwich of roof decking and rigid insulation on top of your rafters.
Depending on the thickness of the insulation you choose this build-up could be quite a thickness. You also don’t want to damage your insulation or its performance when fixing the roof build-up into the rafters. There is also a risk that wind could get under the roof deck, with it sitting on top of the rafters, so you need a really secure finish.
Luckily there are special fixings available that can be driven through the roof decks and insulation into the rafters. These fixings normally have a twisted shaft which means they offer increased fixing strength, check them out.
Self Build Garden Room Starter Guide
Let us send you our Self Build Starter Guide, it's full of the first things to think about when designing & building a garden room