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Old 12-18-2006, 09:25 AM   #1
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Builder applies coating to plywood subfloor


In a townhouse construction project with poured concrete ground floors and plywood second floors I noticed that the builder had applied a thick coating (tan in color) to the plywood subfloor that ran up the wall about an inch. This coating turned the entire floor into a monolithic substrate. I suspect that it may be a fire retardant.

What is this coating, including possible brands?

What is it for?

Code required?

Thanks...

...Christopher

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Old 12-18-2006, 07:22 PM   #2
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Builder applies coating to plywood subfloor


I for one have never heard of doing anything like that.

But Im interested in someone who has.

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Old 12-18-2006, 08:09 PM   #3
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Builder applies coating to plywood subfloor


There isn't going to be radiant heating is there? In researching radiant heating I have seen the tubing stapled to the plywood and then a substrate poured over it.
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Old 12-19-2006, 08:38 AM   #4
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Builder applies coating to plywood subfloor


snmhanson,

Good question. These homes have forced air heat however. Located in South Florida, 10KW heat strip in the A/C air handler for the two weeks a year that we need heat. We use heat so rarely that the complexity of a heat pump is rarely justified.

...Christopher
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Old 12-19-2006, 05:23 PM   #5
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Builder applies coating to plywood subfloor


In townhomes and in high rises I know they do use Gypcrete. It sounds like thats what it is...It is a fire retarding, sound controlling, leveling gypsum cement...Gypcrete is a brand name of the Maxxon Corporation so it may not be exactly that...
I dont know what the code says about it...
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Last edited by dougrus; 12-19-2006 at 05:25 PM.
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Old 12-20-2006, 09:19 AM   #6
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Builder applies coating to plywood subfloor


Doug,

The photo on this web site is exactly what it looks like and the coating definitely has sound deadening properties.

http://www.maxxon.com/index.asp

Thanks much...

...Christopher

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