Building a soundproof room in garage

[xman99]

I want to take about 10 x 12 of my garage and build a soundproof room where i can play my drums. my garage is a double and is insulated with about 80% drywalled and the ceiling height is about 15 feet high. I would like to use 2 existing walls of the garage that are the interrior house walls and build 2 new walls and a 8 or 9 foot ceiling. The concrete foundation goes about 3 feet up from the floor of the garage and then it is studs and drywall. I have "egg carton" sound proofing foam to use for the interior of the walls.

What would be the best way of going about building and sound proofing?...i want minimal sound to go into the house and out of the garage to the outside.

xman99

 

[bpape]

If you want to build up against shared walls, be sure to remove the drywall from those walls first to avoid a triple leaf situation.

Frame the new walls a few inches from the existing studs. Run your own joists to completely decouple things. Insulate everything and double drywall with Green Glue. Box around ANY penetrations like switches, hvac, outlets, can lights, etc. Use a solid core door and add seals.

To prevent flanking through the concrete slab to the block, float a floor. Dri-core works great and will also help with moisture and keeping things temperate.

Foam will not soundproof anything. It's purely a dampener of interior reflections - and not a very good one - especially for something very dynamic and low frequency heavy as drums.

Bryan