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Old 09-16-2013, 06:38 AM   #1
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Question about board gaps


Hello I recently tore down the walls to my 1941 house so I could redo the electrical and insulation. I noticed the the house walls are made with boards going across the 2x4 at an angle. Every boards has about a 1/4 in gap between each other. From inside you can see the siding. Should I foam insulate the the gaps then put up pink insulation? drawing below for visual.

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Last edited by biddlecom; 09-19-2013 at 04:46 AM. Reason: Better photo of wall
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Old 09-16-2013, 06:40 AM   #2
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Question about board gaps


Where are you located?

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Old 09-16-2013, 06:41 AM   #3
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Where are you located?
I am located in Maine
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Old 09-16-2013, 08:15 AM   #4
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Question about board gaps


Okay.

Cold up there for certain.

I would not use foam in the gaps. Way too time consuming and it will stick to the siding and potentially mess with the drainage behind the boards.

I would plan on install rigid boards inside the wall cavities and make sure they are sealed to the studs. This should provide you the air barrier you need as well as prevent vapor migration to the outside surfaces.

Check out Building Science.com and see what they have on file for that type of wall application.

Figure on ADA (Airtight Drywall Application) at a minimum.
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Old 09-18-2013, 04:54 PM   #5
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Question about board gaps


"You can see the siding"---- what type of siding? Address the thermal bridging of the studs, any interior vapor control planned, how thick a foamboard?

Gary
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Old 09-19-2013, 04:54 AM   #6
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"You can see the siding"---- what type of siding? Address the thermal bridging of the studs, any interior vapor control planned, how thick a foamboard?

Gary
So I looked into how my house is set up and it has the siding then it has rigid foam board (not sure how thick but it looked decent - its blue if that matters) then I have the vapor barrier (I think that's what the plastic is) then its the diagonal wall boards then the 2x4 wall structure. The wall boards are slightly spaced from one another (photo above). I wanted to just put Roxul R15 in but im wondering if that's enough? When I was pulling the old insulation out it looked pretty nasty and looked a little compressed and our house was still pretty warm. Also the idea was brought up to extend the exterior 2x4 to 2x6 but if I do that to the entire house it will take away sq footage but it will also allow me to put in Roxul R23 in. And do I need interior vapor control?

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Old 09-19-2013, 03:56 PM   #7
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Location....?

Gary
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Old 09-19-2013, 04:57 PM   #8
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Location....?

Gary
Maine
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Old 09-20-2013, 06:02 PM   #9
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Question about board gaps


Sorry about that..... duh, lol. Must be my meds... I'll answer your latest post; So I Need A Vapor Barrier

Confusing (at least to me with multiple posts on same topic...).

Gary

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