Author Topic: Soundproofing 20ft. Wall Condo  (Read 1401 times)

cc575

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Soundproofing 20ft. Wall Condo
« on: March 04, 2014, 08:35:04 PM »
Hello,

I recently purchased a loft condo and want to add a layer of 5/8" drywall with Green Glue to all the existing walls. The current construction on the common walls is 3" steel studs with blown in fiberglass insulation between one layer of 5/8" drywall in each unit. As you can see from the attached photos, I have very tall walls ending in a metal ceiling that is the direct underside of the roof.



My questions are these:

1) Will the reduction I get from covering only the two large side walls be worth the cost?
2) If I add the extra layer along the wall with the stairs but drywall and seal only above and below the stair chase but do not drywall behind the stairs (I am unable/unwilling to remove them) will that essentially be a waste?
3) Will adding an extra layer inside the closets only on the back walls essentially be a waste if I don't also add a layer to the side interior closet walls as well?
4) What are your recommendations for drywalling around the rafters/metal beams that run through the wall?
5) In the last picture, the master bedroom, will adding a layer to only that wall (shared) reduce transmission, even if I am not adding to the closet to the right (also shared wall inside the closet)?

Thanks in advance. This is a bit overwhelming, but I need to get some reduction.

Randy S

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Re: Soundproofing 20ft. Wall Condo
« Reply #1 on: March 05, 2014, 06:41:43 PM »
My questions are these:

1) Will the reduction I get from covering only the two large side walls be worth the cost?
2) If I add the extra layer along the wall with the stairs but drywall and seal only above and below the stair chase but do not drywall behind the stairs (I am unable/unwilling to remove them) will that essentially be a waste?
3) Will adding an extra layer inside the closets only on the back walls essentially be a waste if I don't also add a layer to the side interior closet walls as well?
4) What are your recommendations for drywalling around the rafters/metal beams that run through the wall?
5) In the last picture, the master bedroom, will adding a layer to only that wall (shared) reduce transmission, even if I am not adding to the closet to the right (also shared wall inside the closet)?

Thanks in advance. This is a bit overwhelming, but I need to get some reduction.

Ok you need to understand that you will have to double the weight of the wall in order to achieve a -5db reduction or a 40% human perceived reduction.
So 2 layers of 5/8" drywall or a layer of mass loaded vinyl and 5/8" drywall to achieve this reduction.
Is that value of reduction is worth the cost to you.
2) the stairs will still give of some sound but not that much.
3) if the closet has a door then you can close it and you should be fine. The clothes should absorb a lot of sound in the closet. if no door then do the whole closet, cant be that much additional cost.
4) you will caulk around the rafters with acoustical caulk, the ceiling will still be a flanking location.
5)if you dont do the closet and no door than that is where you will here noise..
Sound is like water it will always go to the area of least resistance.

The only way your going to achieve more that -5db is to do a complex structure which would require removing the drywall and using clips and channel.




Randy Sieg

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