Hello,
My uncle is a bit cramped for space and is thinking about fixing up the attic for the little guy. It's an old house and the rafters are of a slimmer model. They go all the way up to the ridge without any collar ties (is that what they're called?). The rafters are notched and sit on a beam along the floor. Then the entire ceiling is nailed with boards.
What are the requirements if you want to convert the attic? How big must the air gap be? How thick insulation is usually used? Tips and advice are welcome.
Attached is a picture I put together in Paint
I have the picture on my phone, will upload it later.
My uncle is a bit cramped for space and is thinking about fixing up the attic for the little guy. It's an old house and the rafters are of a slimmer model. They go all the way up to the ridge without any collar ties (is that what they're called?). The rafters are notched and sit on a beam along the floor. Then the entire ceiling is nailed with boards.
What are the requirements if you want to convert the attic? How big must the air gap be? How thick insulation is usually used? Tips and advice are welcome.
Attached is a picture I put together in Paint
I have the picture on my phone, will upload it later.
The air gap is usually about 22mm. Just enough so you can use standard battens.
Insulation in the ceiling varies greatly, but in a modern house, it's around 400. Take the thickness you have on the roof trusses, deduct 25mm for the air gap and hardboard, and then fill the space completely. Then you add a 45*45 crosswise over the roof trusses and put 45mm of insulation in there. That gives you about 200mm, assuming your roof trusses aren't too weak, which it doesn't seem to be judging by your description.
Insulation in the ceiling varies greatly, but in a modern house, it's around 400. Take the thickness you have on the roof trusses, deduct 25mm for the air gap and hardboard, and then fill the space completely. Then you add a 45*45 crosswise over the roof trusses and put 45mm of insulation in there. That gives you about 200mm, assuming your roof trusses aren't too weak, which it doesn't seem to be judging by your description.
