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#1
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OSB as carpet underlayment?
Hi,
I had specified new "underlayment" to be put over the old 3/4" pine board subfloor in a new 2nd story addition. What our contractors installed in our absence is regular 1/2" OSB sheathing material, not specifically rated as underlayment. They screwed and glued it down very well. After two weeks I already see swollen areas and chips coming loose due to water being dragged in and left due to the construction. Is OSB sheathing considered a reasonable underlayment for a carpet? I expected plywood rated underlayment, with the top side sanded, not this chunky stuff which is not even particularly smooth to begin with. Regards, Wolfgang in VT |
#2
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OSB as carpet underlayment?
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#3
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OSB as carpet underlayment?
water is no friend to plywood either.
to save things maybe complete drying with additional fans, Bin primer to seal the floor, top coats of paint that matches the primer type, and a thicker carpet pad. what you bought for the job may vary: there are different finishes on the OSB according to this quoted website. "Special Features of OSB and Waferboard Panels Panels 15.5mm (5/8") and thicker are manufactured either with a square-edge or tongue and groove on the long edges. Panels may be sanded smooth on one or both sides for particular end uses such as floor underlayment or interior finish, or they may be spot sanded to meet the required thickness tolerances. Manufacturers may alter the surface of some of their OSB or waferboard panels to make them more suitable for a particular end-use." it says at: http://www.cwc.ca/products/osb/uses.php |
#4
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OSB as carpet underlayment?
Thanks for the replies. I will talk to the contractor tomorrow. What
they put down in my house is regular "APA rated sheathing", not sanded, no tongue and groove. I specifically excluded OSB from all other areas of construction (wall and roof sheathing, bathroom subfloor), but did not do this for the carpet underlayment since I had never even seen OSB rated "underlayment", so am a little frustrated that they went cheap on me there. Just tells me that one should never "assume" anything in a contract... Regards, Wolfgang |
#6
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OSB as carpet underlayment?
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#7
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OSB as carpet underlayment?
Hi Mike,
The second story is new. The subfloor however was preexisting in the former attic, since we did not change the footprint of the space, only the ceiling height... I specified "underlayment suitable for carpet application" in the contract. What I found so far is that APA does not recommend "rated sheathing" material as underlayment for any floor, only "Sturd-I-Floor" OSB is recommended for carpeting. But I am not saying that what we have now won't work, just wanted to educate myself before talking to the business owner. Do you know if the OSB you have seen is the "sturd-i-floor" stuff? Thanks for your input. Wolfgang |
#8
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OSB as carpet underlayment?
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#9
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OSB as carpet underlayment?
Thanks to Mike and all for the replies. We'll just have to see how it
holds up over time. It would not have been my choice to save 100 bucks or less in material (we are talking 240 square feet here) over proper plywood, but it does not seem to make sense to rip it out at this point. Regards, Wolfgang in VT |
#10
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OSB as carpet underlayment?
Dry it completely then coat with outdoor polyurethane to make it water
resistant if you suspect it will get wet again |
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