This is a detail for sound resistant
wall construction that we commonly use and have had great results
with. It is a bit unconventional as it has never been laboratory
tested and the use of resilient channel over layering is not
often seen. Nonetheless, it has proven to be a pragmatic application
that has sound proofing characteristics in a limited amount
of space and costs. There are ways to increase the efficiency
of
this design by using better grades of soundboard and methods
of layering the other side of the stud. Contact us if you need
help.
Notice of soundboard
compatibility: Recently
there have been materials sold as soundboard that will not
withstand the compression inherit in this design. Celotex or
Homasote brands will work fine. The soundboard should be dense
and not easily broken. If it is easily broken, it is not to
be used in this design.
SPECIFICATIONS FOR WALL LAYERING
Strict adherence to these specifications will obtain the maximum sound resistant construction. It is necessary to insure the rooms are completely airtight. They must be followed and executed EXACTLY, no exception.
- Existing stud or joist cavity requires maximum allowable insulation rating.
- Use appropriate size drywall screws so that screws in channel do not touch studs.
- Start at ceiling. Complete each layer before starting the next layer.
- Hold drywall ¼” from floor. If applied to vinyl barrier, 2 inches of vinyl should overlap perimeter or lay on floor. Caulk perimeter of all drywall layers with acoustic caulk.
- Firetape all drywall layers.
- Drywall layers can be vertical and/or horizontal. Avoid alignment of seams.
- Seal electrical boxes with sound pad. Use caulk and/or expanding foam around any penetrations (i.e., outlets, air conditioning) on each layer of drywall.
- All low voltage wiring will terminate in an electrical box wrapped with sound pad, no open plates.
- In new construction, apply a continuous 1” bead of caulking or construction adhesive to floor plates (wood or metal at bottom of wall). This will insure air seal between the floor and wall.
Related Links for installation and product
information.
Acoustic Caulk: www.usg.com
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