So I finished part of the basement back in 2009. Need to get the rest done.
I'm guessing there is roughly 50' of unfinished wall that needs to be finished.
So back in 2009 the code was for R12. Went to a couple of hardware stores ended up buying 2" C-200 Extruded Polystyrene Rigid Insulation. It actually had strapping that could be installed so you could attache dry wall to it. Thinking back I don't get it code was R12 2" board it R10, I guess they are factoring in the foundation wall will at least be R1.5ish and the drywall R0.5. I did not attache the drywall right to the board I built a 2x4 wall with no insulation between studs.
I've had no issues.
So the code changed in 2012 I believe to R20.
I figure well I guess I can do what i did before and through batt insulation between the 2x4 studs.
I look up 2" C-200 Extruded Polystyrene Rigid Insulation and it doesn't seem common anymore in my area. You can see tons of 0.5" and 1".
I'm thinking the 2" just doesn't make financial sense with the new R20 rule.
So what would be the most cost effective way of framing an R20?
I still want to use Rigid Insulation.
0.5" rigid (R2.5) then 2x6 (Roxul 22) = R24.5
1" rigid (R5) the 2x4 (Roxul 14 = R19 (i need 20 but the whole buying R10 when it was R12 code has me thinking i'm only 1 off and this looks like its probably the most popular in my area by what is supplied at the store. Why else is 1" rigid kept in stock so much).
0.5" 2' wide rigid looks to be $8
1" 2' wide rigid looks to be $16
2x4x8 = $3.30
2x6x8 = $4.48
1/2" 4x8 drywall = $7.79
R22 For 2x6 Studs 24 In. On = $43.89 (Covers: 37.5ft2)
R14 For 2x4 Studs 24 In. On = $45.60 (Covers: 60.1ft2)
R22 For 2x6 Studs 16 In. On = $46.59 (Covers:39.8ft2)
R14 For 2x4 Studs 16 In. On = $$45.59 (Covers: 59.7ft2)
Any reason to go for 16" over 24" on centre?
It is just basically holding up drywall.
Only pro is going from 41 studs (16" On Centre) to 28 studs (24" On Centre)
Saving 13 studs $42.90-$58.24. Mehhh not a huge deal price wise.
-------------------------------------
So i think R19 not including the foundation and drywall would probably be ok code wise since R10 was when the code was R10 (I'll ask the hardware store too).
R19 would cost me:
2x4 (41x3.30) = 135.30
1" R5 rigid (26X16) = $416
50Wx8H = 400SQFT (400/60.1) = 7 bags (7X$45.60) = $320
Drywall 12 4X8 x $7.79 = $93.48
Total = $964.78
------------------------------
R24.5 would cost me:
2x6 (41x$4.48) = $183.68
0.5 Rigid (26x8) = $208
50Wx8H = 400SQFT (400/39.8) = 11 bags (11X$46.59) = 512.49
Drywall 12 4X8 x $7.79 = $93.48
Total = $997.65
Wow closer then I thought. I guess for the $30ish more its worth it to go with the R24.5. Con is it would cost me 1.5" in wall thickness.
Good talk guys.... Haha its helps just to talk this out.
I'm guessing there is roughly 50' of unfinished wall that needs to be finished.
So back in 2009 the code was for R12. Went to a couple of hardware stores ended up buying 2" C-200 Extruded Polystyrene Rigid Insulation. It actually had strapping that could be installed so you could attache dry wall to it. Thinking back I don't get it code was R12 2" board it R10, I guess they are factoring in the foundation wall will at least be R1.5ish and the drywall R0.5. I did not attache the drywall right to the board I built a 2x4 wall with no insulation between studs.
I've had no issues.
So the code changed in 2012 I believe to R20.
I figure well I guess I can do what i did before and through batt insulation between the 2x4 studs.
I look up 2" C-200 Extruded Polystyrene Rigid Insulation and it doesn't seem common anymore in my area. You can see tons of 0.5" and 1".
I'm thinking the 2" just doesn't make financial sense with the new R20 rule.
So what would be the most cost effective way of framing an R20?
I still want to use Rigid Insulation.
0.5" rigid (R2.5) then 2x6 (Roxul 22) = R24.5
1" rigid (R5) the 2x4 (Roxul 14 = R19 (i need 20 but the whole buying R10 when it was R12 code has me thinking i'm only 1 off and this looks like its probably the most popular in my area by what is supplied at the store. Why else is 1" rigid kept in stock so much).
0.5" 2' wide rigid looks to be $8
1" 2' wide rigid looks to be $16
2x4x8 = $3.30
2x6x8 = $4.48
1/2" 4x8 drywall = $7.79
R22 For 2x6 Studs 24 In. On = $43.89 (Covers: 37.5ft2)
R14 For 2x4 Studs 24 In. On = $45.60 (Covers: 60.1ft2)
R22 For 2x6 Studs 16 In. On = $46.59 (Covers:39.8ft2)
R14 For 2x4 Studs 16 In. On = $$45.59 (Covers: 59.7ft2)
Any reason to go for 16" over 24" on centre?
It is just basically holding up drywall.
Only pro is going from 41 studs (16" On Centre) to 28 studs (24" On Centre)
Saving 13 studs $42.90-$58.24. Mehhh not a huge deal price wise.
-------------------------------------
So i think R19 not including the foundation and drywall would probably be ok code wise since R10 was when the code was R10 (I'll ask the hardware store too).
R19 would cost me:
2x4 (41x3.30) = 135.30
1" R5 rigid (26X16) = $416
50Wx8H = 400SQFT (400/60.1) = 7 bags (7X$45.60) = $320
Drywall 12 4X8 x $7.79 = $93.48
Total = $964.78
------------------------------
R24.5 would cost me:
2x6 (41x$4.48) = $183.68
0.5 Rigid (26x8) = $208
50Wx8H = 400SQFT (400/39.8) = 11 bags (11X$46.59) = 512.49
Drywall 12 4X8 x $7.79 = $93.48
Total = $997.65
Wow closer then I thought. I guess for the $30ish more its worth it to go with the R24.5. Con is it would cost me 1.5" in wall thickness.
Good talk guys.... Haha its helps just to talk this out.