Sound insulation

[johnc86]

I'm in the process of building a shed/man cave. It's 5.5 X 2.5 m2 and constructed from timber. Due to budget constraints the floor joists sit on top of 22 equally spaced concrete piers. I've been collecting Rockwool insulation slabs to use in the walls and ceiling. I've used celotex in the floor.
I'd like the room to be as sound insulated as possible without spending a fortune. I'm wondering what sort of system to use for boarding out the walls. I understand that the key is to try and see you up any small gaps and I also realise that not having a concrete floor and the celotex in the floor isn't ideal but it is what it is.
So I'd like information on the best system to board the room out. I'm aware of foam tape which can be used between the joists and the boards and also no sound insulating adhesive which I plan to use anyway to seal up any gaps.
Also wondering whether it's worth double boarding with a gap between the layers?
as I say I don't really want to spend a fortune so just looking for some obvious pointers.

Cheers

 

[Tigercubrider]

Mass is your friend.
Timber isn't exactly ideal.
You need rockwool sound insulation, not warmth insulation.
A double layer of insulation with a gap between is better than a solid insulation. Trying to separate the noise source and the walls transmitting is important. Double layer the plasterboard and stagger the joins so each layer starts 50% away from the edge of the layer below. When butting boards use a runny plaster to fill the gaps as you go and skim the whole lot generously.

 

[johnc86]

I've got proper Rockwool. What would you use to fix the boards to the timber?

 

[Munroast]

Mass is your friend.
Timber isn't exactly ideal.
You need rockwool sound insulation, not warmth insulation.
A double layer of insulation with a gap between is better than a solid insulation. Trying to separate the noise source and the walls transmitting is important. Double layer the plasterboard and stagger the joins so each layer starts 50% away from the edge of the layer below. When butting boards use a runny plaster to fill the gaps as you go and skim the whole lot generously.

apparently a layer of rubber (pond liner or better stll neoprene) sandwiched between the plasterboard is really good.

It is also amazing how much noise can get through a very small gap/hole. so important to pay lots of attention to detail.

 

[Deleted member 174758]

When I sound proofed a previous house a number of years back I glued strips of flooring felt underlay onto the edges of my timber stud framing, then screwed the boards (two layers, all joints staggered) onto the stud work.

Incidentally, I laid the stud wall framing onto a thick bead of silicon all round and fixed them in place using frame anchors (the sort of screws and long nylon plugs normally used to secure windows), the idea being to sound isolate the frame from the floor, walls and ceiling. In the pre-Soundbloc board era it worked very well