Author Topic: some construction questions  (Read 3721 times)


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some construction questions
« on: October 11, 2003, 04:25:44 AM »

how much weight can a 2x10 joist house hold on it's ceiling? Soundproof materials weigh alot, and no need to have the ceiling sag in .

does MLV act as a vapour barrier? When installing next to a batted insulated wall that is also an exterior wall, is there a problem with mold in the batting when a mlv install is sealed totally?


  • Guest
Re: some construction questions
« Reply #1 on: October 15, 2003, 09:30:40 PM »

A standard joist like you describe, if it is 16" on center, can support at least 2 layers of 5/8" drywall with a sandwich of (MLV) between the drywall sheets, with no problem whatsoever.
The MLV is indeed a vapor barrier. Now I have had customers use the MLV right on the outer backer board just prior to installing an exterior wall made of stucco or vinyl siding, and have had no reports or complaints about mold. The MLV needs to be sealed in order to work properly, that is essential.
I hope this answers your questions A.J. Thanks for the post.

Bob Orther
(The Bob Vila of Soundproofing)
Super Soundproofing Sales/Technical Associate.
Ph: (760) 752-3030    FAX: (760) 752-3040
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