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Old 05-28-2019, 08:07 PM   #1
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Basement insulation


I'm starting finishing my basement and am currently working on putting up rigid foam insulation. The basement walls run up about 7'8 while the ceiling joists are about 7'10 from the floor. Should I cut my insulation so that it runs to the top of the wall and then stops? Or should I go all the way up to the ceiling joists? Thanks for any guidance in advance.
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Old 05-28-2019, 08:18 PM   #2
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Re: Basement insulation


You need to insulate the whole area including the rim joists between the ceiling joists.
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Old 05-28-2019, 08:20 PM   #3
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Re: Basement insulation


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You need to insulate the whole area including the rim joists between the ceiling joists.
Sorry, I should have noted that their is already insulation on the rim joists.
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Old 05-28-2019, 08:48 PM   #4
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Re: Basement insulation


If you are building a wall in front after, there should be a fire stop between the wall and the ceiling. It can be drywall, plywood or 2x? that includes over the top plate and is up against the sill plate under the joists on the foundation.
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Old 05-28-2019, 09:11 PM   #5
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Re: Basement insulation


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If you are building a wall in front after, there should be a fire stop between the wall and the ceiling. It can be drywall, plywood or 2x? that includes over the top plate and is up against the sill plate under the joists on the foundation.
Sorry, I'm not sure I'm following what implications that has for my insulation height. I'm fairly new at this...
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Old 05-28-2019, 09:28 PM   #6
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Re: Basement insulation


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Sorry, I'm not sure I'm following what implications that has for my insulation height. I'm fairly new at this...
Will this help
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Old 05-28-2019, 10:27 PM   #7
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Re: Basement insulation


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Will this help
It did! Thank you!
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Old 05-28-2019, 10:33 PM   #8
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Re: Basement insulation


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It did! Thank you!
What ever we use there we cut to the exact measurement to what we want to reach the our side of the top plate and level down from there and then the walls down stairs as square as the room up stairs with out all that extra time trying to figure out where the wall should be.
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Old 05-28-2019, 11:53 PM   #9
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Re: Basement insulation


Before it is all closed in apply a ton of caulking to the foundation to rim seam and all other seams where 2x material comes together. Air leaking in that area is a major heat loss point. If your rim insulation is fiberglass it doesn't stop air.

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Old 05-29-2019, 04:07 PM   #10
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Re: Basement insulation


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What ever we use there we cut to the exact measurement to what we want to reach the our side of the top plate and level down from there and then the walls down stairs as square as the room up stairs with out all that extra time trying to figure out where the wall should be.
Follow up. Can I attach the fire block (probably 2x?s) to the underside of the top plate of the wall frame and run them back to the rigid foam insulation? Or does the fire block need to touch the foundation? I've tried my hand at a beautiful drawing similar to yours to show what I'm talking about.
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Old 05-29-2019, 04:12 PM   #11
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Re: Basement insulation


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Follow up. Can I attach the fire block (probably 2x?s) to the underside of the top plate of the wall frame and run them back to the rigid foam insulation? Or does the fire block need to touch the foundation? I've tried my hand at a beautiful drawing similar to yours to show what I'm talking about.
No it goes to the wood bolted down under the rim, a fire in the wall will melt the foam and you fill the house with all that poison before you get the lids out.
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Old 05-29-2019, 04:45 PM   #12
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Re: Basement insulation


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Old 05-29-2019, 04:54 PM   #13
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Re: Basement insulation


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No it goes to the wood bolted down under the rim, a fire in the wall will melt the foam and you fill the house with all that poison before you get the lids out.
Thanks so much.
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