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Old 02-13-2012, 10:41 AM   #1
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Insulating Basement Walls Question


Just to give you a little back story, I purchased my home with a Full finished basement and bath. I then noticed water that pouring in after big rain storms. I decided to rip out all walls and framing. My question is do I have to insulate basement walls that are below grade next to the foundation? I have been told that I should use R19. The thing is, using a 2x4 framing construction and due to the space I need to put the framing I cannot fit R19. Is this a problem?

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Old 02-13-2012, 10:53 AM   #2
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Insulating Basement Walls Question


Walls should be insulated.

Fiberglass is a horrible option for basements and there are countless threads in here discussing the different approaches to basement insulation.

Where is the home located?

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Old 02-13-2012, 11:01 AM   #3
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Insulating Basement Walls Question


I'm in Northern NJ. I had just spoke with my towns building inspector about the Rim Joist area and Rigid foam. He couldnt understand why I would use the rigid and told me to just use Fiberglas Batts in that area. Since he was so against the Rigid in the joists I figured I he would not like Rigid on the walls either. He also said the Rim Joist needed to be R19, would that also apply to the walls?
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Old 02-13-2012, 11:01 AM   #4
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Is insulating the walls code or is it just a preferred?
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Old 02-13-2012, 11:47 AM   #5
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Teach him, gently.... Rims expand/contract with the seasons and humidity; http://www.buildingscience.com/docum...d-but-strange/

Fiberglass is excellent for furnace filters because it filters dirt. Great for finding air leaks in the attic because air blows right through it: http://www.finehomebuilding.com/PDF/Free/021105092.pdf

Bad for rim insulation because air blows right through it to condense on the wood.....use foam board; http://www.buildingscience.com/docum...l_seal_rev.pdf

As per Code. Find the closest City near you below the map: http://publicecodes.citation.com/ico...001_par001.htm

Find the requirements: http://publicecodes.citation.com/ico..._11_sec002.htm

R-10 in foamboard or R-13 in other. Without the foamboard, you may likely have problems. Notice the different applications of below-grade insulation and the problems with each; http://www.buildingscience.com/docum...study-analysis

The basics in a nut-shell: http://www.buildingscience.com/docum...lation-systems

Of course, local AHJ have the final say.......

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Old 02-17-2012, 04:22 PM   #6
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If I put up 1" of xps can fiberglas touch it?
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Old 02-17-2012, 06:36 PM   #7
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spray foam and forget all of it....probably worth the effort of cutting precise pieces of foam board.
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Old 02-17-2012, 11:07 PM   #8
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It should touch the foamboard: http://joneakes.com/jons-fixit-database/743

Air gaps will give convective loops.

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