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Soundproof Underlayments/Padding for 2nd Floor Apartment

Old 01-06-2021, 08:08 AM
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Default Soundproof Underlayments/Padding for 2nd Floor Apartment

Remodeling our Garage Apartment and want to put down a floor underlayment for soundproofing,, and also want to use a carpet pad that has some soundproofing characteristics. We will be putting down a planked flooring in about 50% and carpeting in about 50%. Any other tips for this job are much appreciated!

Old 01-06-2021, 08:24 AM
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In our Buildings we used GypCrete, it is a self leveling pourable product. We put it down at about 1/2'' to 3/4'' thick. it works excellent as a sound barrier. It also seals all the joints between the plywood decking. You can use this on wood floors also. .




Old 01-06-2021, 08:29 AM
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I used acoustiblok on my last boat and was happy with the results.

https://www.acoustiblok.com/acoustib...fing-material/
Old 01-06-2021, 08:33 AM
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Probably to late but insulating between the joist of the celling of the lower level helps a lot as well.

Edit... 2nd floor.
Old 01-06-2021, 08:42 AM
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The sound proofing underlayment's for carpet are diff then the stuff for plank flooring
Foam and rubber are the best for carpet.
Foam works best underneath laminate floors if it has vapor barrier properties, since that type of flooring is particularly susceptible to moisture. Otherwise, cork will provide even more noise reduction.

I think Coretec has cork backing

Last edited by Thalasso; 01-06-2021 at 08:57 AM.
Old 01-06-2021, 08:45 AM
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Originally Posted by houtxfisher View Post
I used acoustiblok on my last boat and was happy with the results.

https://www.acoustiblok.com/acoustib...fing-material/
All of a sudden this week I've been getting hit with a lot of YouTube ads for the stuff. I'm looking at using it on my boat but I am also thinking about ripping out the carpet in my truck and using it there to cut down on the road noise. What are your thoughts on it?
Old 01-06-2021, 08:49 AM
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My recommendation is first to decide what type of sounds you want to dampen. Acoustic transmission (ex: loud music) or impact transmission (ex: footsteps) or both. I’ve done a bunch of research on this topic and tried a few different products on walls.

Here is my advice...
Acoustic Transmission: Step 1 is fiberglass or rock wool insulation between the joists. Step 2 is mass loaded vinyl tacks to the bottom face of the joists.

Impact transmission: Step 1 is cork. Step 2 is carpet and padding.
Old 01-06-2021, 08:55 AM
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can you double up the sheet rock below it?
Old 01-06-2021, 09:00 AM
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https://www.ecoreathletic.com/Produc...pad-and-Infill
Old 01-06-2021, 10:55 AM
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The good news is that most of the rooms below (first floor) are unfinished , so I can do as suggested and change out the fiberglass insulation to the "rock wool" insulation & in addition I will used a "drop" ceiling vs drywall and I will use soundproof ceiling tiles. I think that will help a lot. However, my questions for now is :

1. what underlayment (like 1/8") would be good under the laminate floor? (perhaps under the carpet too)
2. What type of carpet padding is available that has some soundproofing characteristics?

THX for all replies!

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