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Old 09-16-2013, 01:19 PM   #1
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Roxul R-15 in Maine


Hello, I am remodeling my house. I took down all the sheet rock and have bare walls now. It looks like the outside of the house does have a rigid foam insulation under the siding. And the wall frame is 2x4. The boards for the wall are set diagonally and spaced out a bit (Photo Below). So Im just wondering if I use R-15 Roxul in the walls would that be enough to keep my house warm? Is there anything else I should do? I dont know much about insulating but I do know I need to get it up before winter hits.
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Old 09-16-2013, 03:00 PM   #2
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Roxul R-15 in Maine


It all depends on how thick the "rigid foam " is and what type of foam it is.

Roxul is definitely better much than fiberglass, but keep in mind with batts in the joist spaces you will not get an R15 wall from R15 batt insulation because the heat loss from the studs.

It looks like you have good "bones" to start with.

You should also give some concern as to where you want a vapor barrier since you should avoid a double vapor barrier and your foam exterior could be your vapor barrier already.

Dick


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Old 09-16-2013, 06:00 PM   #3
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Roxul R-15 in Maine


Roxul will be better in this case as it is very resistant to air/wind wash.

How thick is the foam?
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Old 09-17-2013, 05:22 AM   #4
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Roxul R-15 in Maine


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Roxul will be better in this case as it is very resistant to air/wind wash.

How thick is the foam?
I wasn't able to tell. I can take a look at it today when I get home. Either way I don't think I can fit anymore than that. I also heard of extending your 2x4 for a 2 in piece of wood to make them 2x6. that way I can fit an r23 or something slimier. Has anyone heard of do that and is it worth it?
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Old 09-17-2013, 09:33 AM   #5
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Roxul R-15 in Maine


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I I also heard of extending your 2x4 for a 2 in piece of wood to make them 2x6. that way I can fit an r23 or something slimier. Has anyone heard of do that and is it worth it?

i am doing just that. except i am doing 1". so i can fit 1" XPS and R-15 roxul.
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Old 09-17-2013, 09:37 AM   #6
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Roxul R-15 in Maine


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i am doing just that. except i am doing 1". so i can fit 1" XPS and R-15 roxul.
Is adding the 1 inch working out well?

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Old 09-17-2013, 10:28 AM   #7
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Roxul R-15 in Maine


again, i am adding 1". not 2" . but yeah, i think it is working VERY WELL. our gas bill isn't very high, actually quite resonable. and that was with only 2/3 of the house done. i am doing most of the last 1/3 right now.

my house needs new siding. when i get around to doing that, i am going to put 1" xps under the siding. as recommended by the fine folks on this forum.
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Old 09-18-2013, 03:50 PM   #8
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Roxul R-15 in Maine


What kind of siding?
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Old 09-18-2013, 07:38 PM   #9
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Roxul R-15 in Maine


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What kind of siding?
me ? idk. but it can't be anything pricy. this house isn't worth it ( the neighborhood its in). so far, its either vinyl double dutch or T-11.
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Old 09-18-2013, 11:47 PM   #10
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Roxul R-15 in Maine


I like roxul great choice
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Old 09-19-2013, 01:09 PM   #11
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Roxul R-15 in Maine


Wood panel siding may be problematic as the moisture drive stops at the f.b. and could keep it wet longer, pp.65; http://books.google.com/books?id=iwS...rafter&f=false

Heat, moisture and wood; http://bct.eco.umass.edu/publication...n-the-outside/
IMO, requires more research....

Gary
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Old 09-19-2013, 01:17 PM   #12
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Roxul R-15 in Maine


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Wood panel siding may be problematic as the moisture drive stops at the f.b. and could keep it wet longer, pp.65; http://books.google.com/books?id=iwS...rafter&f=false

Gary
I have vinyl siding
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Old 09-19-2013, 03:40 PM   #13
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Roxul R-15 in Maine


Vinyl is fine with that make-up. One of the problems with multiple posters.... lol.

Gary

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