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Old 03-02-2020, 06:59 PM   #16
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Re: Insulating basement in the north east


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Originally Posted by Bud9051 View Post
Hi Lb, all I can do is give you my recommendations and by the way I'm a retired energy auditor, so not just a visitor with hometown advice.
1. I prefer Roxul over fiberglass. A quick search will describe how it is well suited for below grade applications and provides a bit more r-value.
2. Wall assemblies need at least one direction to dry and in a basement that would be to the inside for areas below grade, so no kraft backing and definitely no plastic VB.
3. Adding a layer of rigid insulation between framing (and insulation) and the foundation is good.
4. Technical note in regards to concrete (or blocks). Concrete acts like a sponge and passes moisture through it easily. Even the damp proofing on the outside or any paint product on the inside will never stop 100% of the moisture vapor. it is beautifully dry right now because any vapor coming through is passing directly to the air. The good news is the amount of vapor is tint and presents no problem in the basement. it only becomes a problem when it is blocked by something like a layer of plastic so it can accumulate and feed any mold spores.

I actually doubt your basement will have any problems but I would still avoid the VB.
Also note, be sure your rigid insulation is not covered with a layer of plastic. 1" pink or blue has a permeability that permits some drying to the inside.

If you are in southern Maine there is an active group down there building some interesting energy efficient homes, Portland area.

Bud
Sounds like sage advice and I am actually in Southern Maine.

Based on your advice this will be my path forward. Please respond and let me know if I'm missing anything.

I'm going to use the foam insulation board against the concrete. Is liquid nails the best way to attach it? Will 1/2 inch board be sufficient or do I need to go with 1 inch? I have read that I should also caulk around the edges of the foam board as well. I'm assuming a silicone caulking will do the trick.

Once the poured concrete is taken care of it sounds like I can just go ahead and add the batting between the studs and dry wall as normal. I've seen Roxul and I believe Deering Lumber carries it so I'll price it and go from there. Appreciate the advice and the assistance. If I've missed anything let me know.
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Old 03-03-2020, 03:30 AM   #17
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Re: Insulating basement in the north east


Sorry, fell asleep early last night. At my age you take sleep when you can. But then awake at 2 am so finally got up at 4.

" Is liquid nails the best way to attach it?" It works but is slow to cure and hold. If you can wedge it in place once secured it will stay.

" Will 1/2 inch board be sufficient or do I need to go with 1 inch?" The objective is to ensure the inside surface of the foam board remains above the dew point. The irony is, that means more rigid or less fluffy stuff. Too much fluffy makes that surface colder. Safer to go with 1" especially where any of the foundation is above grade.

Technical note, any foundation area more than 2' below grade suffers very little heat loss. All of the soil acts as insulation.

" I have read that I should also caulk around the edges of the foam board as well. I'm assuming a silicone caulking will do the trick." Yes, see note

Be sure to air seal and detail the rim joist cavity and add fire blocking to the top of your wall.

Bud

Note: I use Loctite Premium 3X in the large tubes. Large tubes cost less per volume and I find the construction adhesive is easy to cap and holds well for months. I cap the end with foil tape.
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Last edited by Bud9051; 03-03-2020 at 03:35 AM.
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