Hi all
I've got a new 20' x 6'6" workshop, attatched to a new guest house.
The joining wall is a well insulated stud wall, with 12mm ply on the inside.
I've insulated the sloping roof with about 170mm rockwool, with 11 OSB underneath.
The floor is just the concrete base, will a floor levelling compound and DPM, and I don't want to insulate it (not worth it, since the floor finsh is as I wanted it).
The front of the shops is just a pair of FLBs, which I will add a small amount of 25mm insulation to.
I'm wanting to insulate the remaining back and side wall, and I'm not sure whether to
a) use battens with celotex in between (no void), then OSB on top
b) use battens with celotex on top (leaving a void), then OSB on top of that.
ie, I don't know whether I need to leave a void between the walls and the celotex.
The walls are only half thick brick, rendered on the outside where they are exposed (but not fully rendered). They are always dry to touch, although I haven't used a damp meter on them.
I'm also not sure whether to go for 1" or 2" celotex, I'm not sure if it'll make a lot of difference, since I'll not be trying to keep it warm when I'm not in it, I just want it to warn up once I'm in with a radiator (electric) on.
So what do you think:
void or no void?
1" or 2" of insulation?
Any help much appreciated
Thanks
I've got a new 20' x 6'6" workshop, attatched to a new guest house.
The joining wall is a well insulated stud wall, with 12mm ply on the inside.
I've insulated the sloping roof with about 170mm rockwool, with 11 OSB underneath.
The floor is just the concrete base, will a floor levelling compound and DPM, and I don't want to insulate it (not worth it, since the floor finsh is as I wanted it).
The front of the shops is just a pair of FLBs, which I will add a small amount of 25mm insulation to.
I'm wanting to insulate the remaining back and side wall, and I'm not sure whether to
a) use battens with celotex in between (no void), then OSB on top
b) use battens with celotex on top (leaving a void), then OSB on top of that.
ie, I don't know whether I need to leave a void between the walls and the celotex.
The walls are only half thick brick, rendered on the outside where they are exposed (but not fully rendered). They are always dry to touch, although I haven't used a damp meter on them.
I'm also not sure whether to go for 1" or 2" celotex, I'm not sure if it'll make a lot of difference, since I'll not be trying to keep it warm when I'm not in it, I just want it to warn up once I'm in with a radiator (electric) on.
So what do you think:
void or no void?
1" or 2" of insulation?
Any help much appreciated
Thanks