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Old 03-01-2018, 05:56 PM   #1
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roofing felt between subfloor & underlayment


I've stripped the flooring down to my subfloor. Is felt needed below the new underlayment given I insulated my entire crawl space?
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Old 03-01-2018, 07:07 PM   #2
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Re: roofing felt between subfloor & underlayment


What style of subfloor do you have there?

The only time I have seen or used tar paper between layers is where the bottom layer is 1 x 6 tongue and groove or shiplap or regular s4s lumber. Back in the olden days, before plywood. And way before OSB.
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Old 03-02-2018, 12:47 PM   #3
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Re: roofing felt between subfloor & underlayment


I believe you would classify my house as of the "olden" days; the original structure was built in 1949. The subject subfloor is constructed with t&g 2x4s. Back then I guess the only form of available insulation was newspaper found in my exterior walls or some sort of tar paper laid between the subfloor and underlayment. There is now ample insulation, hence my original question. Thanks!
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Old 03-02-2018, 05:16 PM   #4
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Re: roofing felt between subfloor & underlayment


No. It all has to breathe., and your underlayment is particle board. We read all the posts. Any moisture collected by the felt will cause the particle board to swell.
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Old 03-02-2018, 08:55 PM   #5
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Re: roofing felt between subfloor & underlayment


"Half of Communications is Listening, and You can't Listen with your Mouth."

Yea, your quote is good. However your answer added important info but failed totally to explain a solution, hence, your answer is not helpful to the end result.

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Old 03-03-2018, 05:47 AM   #6
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Re: roofing felt between subfloor & underlayment


Just what do you need to "totally explain" anything. Don't use a vapor barrier. The layers need to breathe. If you use the vapor barrier, moisture will collect between the layers and the particle board will absorb water and buckle. But I find that I repeat myself.

I asked my 9 year old grandson if he understood what I was talking about and he said he did.

My quote is working.

Since you have insulated below, the insulation will have a vapor barrier built in and it should be facing up towards the floor.
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