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Old 05-20-2013, 04:38 PM   #16
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basement renovation 2x4 vs 2x3 and using XPS


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What is your plan for flooring/sub flooring?
Not sure if you're asking me, or the original poster. I'm still researching, but I'm currently thinking of vapor barrier, then 3/4" XPS foam, then Advantech subfloor, then a floating engineered hardwood floor.

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Old 05-21-2013, 02:02 PM   #17
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basement renovation 2x4 vs 2x3 and using XPS


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Nice, I have a walk out basement that I'd like to finish someday too. I'm also thinking rigid foam and 2x4 framing, but using Roxul for cavity insulation.

Exactly what i am going to use. Hopefully the Roxul is not overkill with the 2 inch XPS. What you doing for subfloor?
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Old 05-21-2013, 02:33 PM   #18
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basement renovation 2x4 vs 2x3 and using XPS


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Exactly what i am going to use. Hopefully the Roxul is not overkill with the 2 inch XPS. What you doing for subfloor?
I'm in MA, and to meet the requirements LINK, I'll need R13 continuous or R17 cavity. I'm using the exterior wall numbers because I have a walk out basement where at least half of the walls are above grade. I'll check with my local inspector to make sure before I buy anything, but those are the numbers I'm starting with.

Yup, it could be overkill. What's nice about doing it on my own, is I can put up XPS first, and see what it feels like in the winter with just that. I might decide the XPS alone is good enough.

I really don't know what I'm doing with the floor yet. I don't have a good handle on what R value I should shoot for. On the low end, I'm thinking of using DMX 1 step underlayment LINK. According to them, that's an R value of 2.2, has got the vapor barrier built in, and I can put a floating engineered hardwood floor right on top.

On the high end, I'm thinking some vapor barrier, then 1" XPS foam R5, then floating hardwood. Earlier I was thinking Advantech subfloor over the XPS, but I think that's only needed if I have to nail down a hardwood floor.
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Old 05-21-2013, 03:12 PM   #19
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basement renovation 2x4 vs 2x3 and using XPS


Do your local building codes still allow vapor barrier? My inspector says no vapor barrier. I'm leaning towards no XPS with a 1/2 gap between 2x4 and wall and then just using R15 roxul.
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Old 05-21-2013, 03:17 PM   #20
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basement renovation 2x4 vs 2x3 and using XPS


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I'm in MA, and to meet the requirements LINK, I'll need R13 continuous or R17 cavity. I'm using the exterior wall numbers because I have a walk out basement where at least half of the walls are above grade. I'll check with my local inspector to make sure before I buy anything, but those are the numbers I'm starting with.

Yup, it could be overkill. What's nice about doing it on my own, is I can put up XPS first, and see what it feels like in the winter with just that. I might decide the XPS alone is good enough.

I really don't know what I'm doing with the floor yet. I don't have a good handle on what R value I should shoot for. On the low end, I'm thinking of using DMX 1 step underlayment LINK. According to them, that's an R value of 2.2, has got the vapor barrier built in, and I can put a floating engineered hardwood floor right on top.

On the high end, I'm thinking some vapor barrier, then 1" XPS foam R5, then floating hardwood. Earlier I was thinking Advantech subfloor over the XPS, but I think that's only needed if I have to nail down a hardwood floor.
Also in MA and checked with my inspector and was told if i get R10 on the basement walls don't need any insulation between the 2x4 but it is my option. Was also told that dricore could be used and if wall is on dricore no PT wood is required since not touching cement. Wanted me to stay away from using PT in basement if possible. Thanks for the info on DMX-1 going to look into it just don't know if that will allow water to flow to my subpump in case i do get water up from the floor.
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Old 05-21-2013, 03:34 PM   #21
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basement renovation 2x4 vs 2x3 and using XPS


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Also in MA and checked with my inspector and was told if i get R10 on the basement walls don't need any insulation between the 2x4 but it is my option. Was also told that dricore could be used and if wall is on dricore no PT wood is required since not touching cement. Wanted me to stay away from using PT in basement if possible. Thanks for the info on DMX-1 going to look into it just don't know if that will allow water to flow to my subpump in case i do get water up from the floor.
Cool, add your location to your profile! Is your basement walkout, or all below grade?
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Old 05-21-2013, 03:47 PM   #22
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Do your local building codes still allow vapor barrier? My inspector says no vapor barrier. I'm leaning towards no XPS with a 1/2 gap between 2x4 and wall and then just using R15 roxul.
I don't know, haven't contacted them yet. I've never contacted an inspector actually. I have read that leaving a gap is a very bad idea LINK. Roxul make a board product if you don't want to use XPS behind the 2x4s.
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Old 05-21-2013, 08:18 PM   #23
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basement renovation 2x4 vs 2x3 and using XPS


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Cool, add your location to your profile! Is your basement walkout, or all below grade?
It is a walkout basement and really only front is below grade ..
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Old 05-21-2013, 10:10 PM   #24
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basement renovation 2x4 vs 2x3 and using XPS


So what thickness xps is minimum requirement in zone6?
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Old 06-10-2013, 09:23 AM   #25
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basement renovation 2x4 vs 2x3 and using XPS


Sorry for not responding. I must have missed the email notification showing there were some replies to my thread.

As far as the stairway, my plans are to move this stairway. The current location will interfere with the future master bedroom.

As far as the flooring, my plans were to seal the concrete, use a vapor barrier, insulation/padding, and carpet. Is this a bad idea?

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Last edited by jruppert; 06-10-2013 at 09:24 AM. Reason: I just realized I had a different account on this site. Odd...
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