Stage build - roofing felt or liquid nails between OSB layers? - AVS Forum
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post #1 of 10 Old 09-02-2013, 04:45 AM - Thread Starter
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So yesterday I spent all day building an 18' wide stage for the theater room. The first layer of OSB for the top is down and I need to add the second layer to finish it off. I have read that most people are putting roofing felt in between layers but wanted to see what people thought of using liquid nails instead (and regular nails) .

Is the layer of felt really crucial for minimizing the vibrations?

Notes: roofing felt was used as the stage base layer as well as 2000+ lb of sand to fill the stage.

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post #2 of 10 Old 09-02-2013, 04:55 AM
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First choice would be Green Glue. Second choice would be roofing felt. I wouldn't use regular glue or adhesive. Also, I suggest screws over nails to keep everything tight over time.

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post #3 of 10 Old 09-02-2013, 05:27 AM
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+1 GG first choice, then felt. Use screws

Looking at the pictures I don't see a lip (overhang) of the top decking. Your carpet layers are going to hate you. With a lip they cover the top bring it around under the lip and staple out of sight. Then cut a strip for the vertical fronts. With no lip bringing it out around and down a curved stage will be a challenge. If you planned on banging on something after the fact, never mind.
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post #4 of 10 Old 09-02-2013, 08:19 AM - Thread Starter
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Thanks fellas. I will source GG to use and will use screws to hold it down.

And yea, I'm planning a 1.5" lip over the curve.

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post #5 of 10 Old 09-02-2013, 08:23 AM - Thread Starter
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Another question, 1" or 1.5" lip?

My only concern in having a larger lip is someone stepping onto the stage on the lip and it eventually breaking.

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post #6 of 10 Old 09-02-2013, 08:31 AM
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The best solution would have been to cut the lip as part of the plywood.  That way there is no risk of it breaking off.  I don't know if it is too late to recut those pieces (probably worth the time and cost).

 

For Green Glue, contact Ted or John at the Soundproofing Company.

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post #7 of 10 Old 09-02-2013, 08:47 AM - Thread Starter
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The second layer will have the lip as part of the cut. I just didn't put a lip on the first layer. It looks like my local Menards hardware store sells GG.
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post #8 of 10 Old 09-02-2013, 08:56 AM
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How thick is the second layer?  A 1 1/2" layer shouldn't break off if it is 3/4" thick.

 

Make sure you buy the "noise proofing compound", not the sealant. 

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post #9 of 10 Old 09-02-2013, 09:25 AM
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recommended coverage is two tubes per full 4x8 sheet.
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post #10 of 10 Old 09-02-2013, 10:52 AM - Thread Starter
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Base layer is 7/16. Top layer with lip will be 3/4". I should have used 3/4 for both but ill save that for the "what would I do differently thread" :-\.

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