Technology: Why don't they make an air gap this way? Or do they?
But how did you handle the insulation?Enk Projektet said:Here's how I did it...
Half the price compared to masonite.
No problems with potential condensation, it runs off very easily....
1. Do you KNOW that insulation reached everywhere? (Because with the inner ceiling you probably couldn't see if there were air pockets?)
2. Isn't there a risk that the wind barrier stretches so that the insulation lies against the outer roof?
2. no risk when you have 45mm of air space.
When I worked on the roof last summer, it was dry almost the entire time, but one should expect to have tarps ready to use. Started in the morning by insulating, then laid the membrane, followed by 45x45, then tongue and groove boards and roofing felt, then I was tired enough so that was it for the day, and took a rest until the next day. In my thread, there are more pictures of how I did it, but I divided it over 3 days. One day for the simpler back side, then the front side was split over two days because of the angles and valleys.
If we start from TS construction: What happens if you use a real diffusion-open roofing membrane instead of the oil board and PU insulation between the rafters? The insulation is rain-resistant, and the roofing membrane can be rolled out quickly. If it rains while rolling it out, it lets through the moisture that has gotten underneath. And 170 mm PU insulation is almost equivalent to 300 mm of mineral wool.