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Old 08-16-2010, 02:05 AM   #1
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What is this second layer behind drywall?


So I was doing some ceiling demo and discovered there is more than just drywall hung in the ceiling. Behind the 1/2" drywall is another layer of 1/2" board. It looks like cork or compressed paper fibers.

Anyone have any idea what that is or what its for? My best guess was extra sound dampening.

It also made it very hard to cut out because the paper fibers kept clogging the saw blade.
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Old 08-16-2010, 09:06 AM   #2
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What is this second layer behind drywall?


Looks like Homasote, maybe their 440 SoundBarrier. Yeah, I think it's made from compressed paper.

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Old 08-16-2010, 09:27 AM   #3
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What is this second layer behind drywall?


It looks like Homasote which was a product widely used in the 1940’s all the way up to the 1970’s, then when drywall started being used homasote became a thing of the past like everything else.

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Old 08-16-2010, 02:04 PM   #4
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What is this second layer behind drywall?


so what's the best way to cut through it?
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Old 08-16-2010, 02:21 PM   #5
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What is this second layer behind drywall?


Quote:
Originally Posted by acerunner View Post
so what's the best way to cut through it?
A razor knife.
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Old 08-22-2010, 11:50 AM   #6
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What is this second layer behind drywall?


Or a drywall "keyhole" saw.

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