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Old 09-29-2014, 11:12 AM   #1
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subfloor/underlayment prep for hardwood


Background: I am installing new hardwood over crawlspace area in Bay Area CA. In order to make the finish floor height match tile floor height in adjacent kitchen I am adding layer of 1/2" ply as underlayment on top of the 3/4" subfloor which I have already leveled. The hardwood instructions call for 15# felt paper vapor retarder which I am installing under the 1/2" ply.

Question: In understand that it is a good idea to use some sort of paper under the hardwood itself to minimize squeaks. Can I now use tar paper for that or would it be a problem to have the 1/2" ply sandwiched between two vapor retarders in which case I guess I would use red rosin paper? Also, if sandwich is OK, will the two layers provide me extra benefit or will it effectively reduce the total subfloor perm rating to a level that would actually cause me a problem? Note also that I said tar paper instead of #15 felt for right under the floor would there be a benefit to actually using the felt here as well instead of the thinner tar paper?
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Old 09-30-2014, 02:51 PM   #2
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construction paper


Naul,

I don't see any problem with using 2 layers of construction paper and you would get an extra benefit for the squeaks as you mention as well as an extra insulating layer, which would be a benefit given its over a crawl space. However, I can't speak to the perm rating issues at all…need some other opinions on that one.
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Old 09-30-2014, 05:23 PM   #3
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Quote:
Originally Posted by naulleau View Post
Background: I am installing new hardwood over crawlspace area in Bay Area CA. In order to make the finish floor height match tile floor height in adjacent kitchen I am adding layer of 1/2" ply as underlayment on top of the 3/4" subfloor which I have already leveled. The hardwood instructions call for 15# felt paper vapor retarder which I am installing under the 1/2" ply.

Question: In understand that it is a good idea to use some sort of paper under the hardwood itself to minimize squeaks. Can I now use tar paper for that or would it be a problem to have the 1/2" ply sandwiched between two vapor retarders in which case I guess I would use red rosin paper? Also, if sandwich is OK, will the two layers provide me extra benefit or will it effectively reduce the total subfloor perm rating to a level that would actually cause me a problem? Note also that I said tar paper instead of #15 felt for right under the floor would there be a benefit to actually using the felt here as well instead of the thinner tar paper?
Does the crawl space have a vapor barrier?
Does the crawl space have cross-ventilation?
Do you use a dehumidifier?
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Old 10-03-2014, 11:46 PM   #4
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Has cross ventilation with smartVent system. Thinking of installing foam board insulation to bottom of subfloor between joists.
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Old 10-04-2014, 11:30 AM   #5
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You don't put tar paper inside the house. Tar off gasses VOC's.
Floors squeak not flooring.
You should investigate under the joists to eliminate squeaking buy adding some metal brackets or glue.
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Old 10-05-2014, 11:29 PM   #6
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Would I be voiding the flooring warranty? The flooring installation instructions clearly state to use 15# felt paper meeting ASTM D4869 standards.
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