This is what happens when it is below zero for several days. Imagine this behind your foam board.
2026-02-15 03:43:58
65
no :
You buy insulation once. You buy heat every day.
2026-02-15 19:17:26
82
Kdnseco :
Just a mold sandwich between the foam and cement
2026-02-14 18:19:21
13
fizikly :
that 2° is a constant difference for the lifetime of the structure. Heat loss/gain calculations are based on ∆T. Materials have a cost associated with them. The labor cost difference between 1" and 2" is negligible. The shipping cost for 2" is potentially doubled depending on the required amount. the deciding factor is how long the original owner of the house intends to live in that house. If the planned residency exceeds the time necessary to recoup the additional cost by means of reduced energy costs, it makes economic sense to invest in the 2", otherwise it makes sense to stick with the code minimum.
2026-02-15 13:50:54
12
JohnJr7979 :
Frame the perimeter with 2x4’s, add R13-R-15 batts. This gives your client a more energy efficient basement, and it saves them cost down the road when they finish it. Just add electrical and drywall it.
2026-02-15 22:11:42
16
Beatdown :
mold city
2026-02-15 12:16:18
8
user8972587099871 :
That is not styrofoam. It is extruded polystyrene, or XPS.
2026-02-15 00:49:30
14
tbone :
You are measuring surface temperature of the insulation it has nothing to do with the conduction of cold through the insulation. You are basically just showing the temperature of the room.
2026-02-16 16:07:42
1
david.kesterke :
1.5” is the way to go…
2026-02-15 22:18:28
4
David Winchester849 :
Depends what the code says for your climate zone.
2026-02-15 19:24:22
3
watchmefam :
i would bet sadly you would save more putting that money in the market and getting 7% back than what you get from your energy bill savings!
2026-02-16 05:42:19
0
K Rodammer :
For 1 degree difference I’d say go with 1”
2026-02-15 16:49:00
13
Rose and shine 80 :
Nope, not worth it! But that’s just my opinion is all, if anyone does it that’s their decision and more power to them!
2026-02-15 13:50:05
1
Brock Norton588 :
That might not seem like much in an instant but over thousands of winter days? I’m saying the 2” is a better investment.
2026-02-15 01:45:39
26
Jay Wolff :
What was the outside temp and location when this was checked. Roughly how deep was the frost outside
2026-02-16 15:16:21
0
Jerry Tatman :
Put as much in as you can afford, you will get the savings back each month in savings. Most importantly the wall needs to be waterproofed on the outside and that’s where some have issues
2026-02-15 11:48:22
12
Tallan McCormick :
Make sure you have an air gap between the wall and foam! Condensation will build and mold will form. Also your R value should increase
2026-02-15 14:17:50
9
JT :
What is the air temperature of the room ?? That could make a big difference!!!
2026-02-16 05:10:18
1
sailman397 :
Is the ceiling insulated? Is the basement conditioned? Need for information for that calc
2026-02-15 10:50:50
2
Florie A :
ok whats going over the foam ?? how much r value will that give you ? once you add it all together the 1 inch may be enough
2026-02-15 17:54:14
1
ronlind4 :
2x4 wall with R15 batts 👍👊
2026-02-16 13:50:37
1
JWoody :
if you are going to stud it, why not just do r13 on 2x4 rolled or r19 on 2x6
2026-02-16 02:05:49
1
H. I. McDunnough :
You’re gong to get mold behind that foam.
2026-02-16 12:02:53
1
spooge031 :
Foam insulation is more about performance than anything else I think about a Styrofoam cup that 8th inch piece of Styrofoam keeps that beverage quite warm /cold and you barely feel the warmth or coldness going through it
2026-02-15 15:09:51
2
jeffgantert176 :
NO VAPOR BARRIER NEEDED?
2026-02-15 14:16:53
1
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