Extra thick door and frame gap... sound proofing

B_Sharp

New Member
Hi folks, bare with me, this could be a stupid question! I'm about to sound proof a friends garage to build a music room, essentially build a room within a room, basic stud work, rockwool and double boarded.

My plan is to make a door and pack it with rockwool. I'd imagine it will come out about 100mm thick, my question is how much space would I need to leave between the frame and door to avoid binding/catching... I might be over thinking it but I can image the edge of the door getting stuck on the frame.

A little more explaination...

We are going to leave the original garage door in place and build an internal door for extra sound deadening. In an ideal world i'd just stick a double glazed door in, however the apature is a really odd size and custom upvc is out of the budget, we do however have loads of scrap timber and ply.

I did consider a sliding door but getting it to seal would be a bit of a nightmare.

Any ideas or other suggestions welcome!
 
The diagonal will be about 6mm greater than the door width. I'd probably look at a stepped edge to get a better seal.
 
The diagonal will be about 6mm greater than the door width. I'd probably look at a stepped edge to get a better seal.

Bare with me, its been a long time since I did proper carpentry... by diagonal do you mean the necessary gap between the frame and door? I'm planning to put a fairly hefty edge around the frame with a thick weather strip.
 
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