Home Soundproof Garage - Garage Conversion Stage 4 Soundproof a Room stage 4 Part 2
Soundproof a Room stage 4 Part 2

Erect the inner stud wall

The stud frame for the inner wall was put up next. It would have been better to avoid connecting the top of the uprights to the rafter joists. This causes sound to be transmitted from the inner walls into the exterior frame of the building. This turned out not to be a massive problem, but the room would have performed better had the situation been designed around.Soundproof Garage inner walls soundproof room rockwoom insulate

A better alternative would have been to drop the top plate of the stud wall down 110mm (4 3/8") short of the rafters, then to add in a separate set of ceiling joists . Into the remaining gap between the stud wall and the ceiling joists, wedge in neoprene blocks. This would allow the walls and ceiling to be firmly held in place, but without creating a mechanical connection between the inner and outer structures. (in other words, without creating a connection that would transmit vibration). It is at this point that the cargo strapping would have been used to provide central support for the ceiling.

Insulate the inner stud frame

Inner stud frame

Due to the plasterboard (drywall) sheets being 1200mm x 2400mm, the inner stud frame was constructed with the uprights at 600mm centres. However, Rockwool slabs are also manufactured to be 600mm wide. Therefore, a small slice had to be cut off each slab (hence the large pile of thin slices in the photo).

Soundproof Garage inner walls soundproof room rockwoom insulate

Insulated stud frame

The ceiling was insulated with 50mm expanded foam insulation. This type of insulation was used mainly because I had it to hand, rather than for its acoustic properties!

The wall boxes for the power sockets were mounted to the stud frame at this time as well.

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