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01-17-2012, 03:08 PM
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#1
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Member
Join Date: Dec 2011
Posts: 60
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R13 vs R13
Hey all, 1dumbquestion here with... well, a dumb question. I was looking at home depot for some insulation and they have R13 in 32' rolls or in precut batts. It's more than 40% more to buy them precut than in rolls. does that sound normal? Wow, now that I've typed it it really is a dumb question, it just seems that 40% is a lot to pay for act of cutting. Now that I've got your attention I'm remodeling an old house that had no insulation it has 2x4 walls and trusses, I was planning on R13 batts for the walls and spray in for the ceiling (currently there is no drywall so I could do something different). What is needed in the crawl space? I'm in Oregon. Thanks, 1
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01-17-2012, 03:27 PM
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#2
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Member
Join Date: Dec 2009
Location: Near Cleveland, Ohio
Posts: 1,325
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R13 vs R13
1D,
I just bought a bunch of insulation at HD recently and noticed the same thing. Needless to say I bought the rolls that weren't precut. You have to watch the big box stores, they many times have similar items but charge a lot more for a little convenience.
Mike Hawkins 
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01-17-2012, 04:01 PM
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#3
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Newbie
Join Date: Jan 2012
Location: Kansas
Posts: 15
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R13 vs R13
convenience costs - isn't that the truth! I've found that the rolls work just as well anyway! 
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01-17-2012, 04:09 PM
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#4
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Member
Join Date: Nov 2011
Location: Hartfield VA
Posts: 18,313
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R13 vs R13
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01-17-2012, 04:12 PM
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#5
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Newbie
Join Date: Jan 2012
Location: Kansas
Posts: 15
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R13 vs R13
Oh.. I guess there still was a question to answer 
Good call joecaption - taking care of business!
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01-17-2012, 06:12 PM
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#6
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Member
Join Date: Oct 2006
Location: Minneapolis/St. Paul, Minnesota - Latitude 45.057 Longitude -93.074
Posts: 3,334
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R13 vs R13
Just remember that R13 insulation in a wall gives you a wall much less than R13 (R10-11) because of the framing. Not like using XPS foam.
Dick
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01-18-2012, 01:48 PM
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#7
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Moderator
Join Date: Mar 2009
Posts: 8,786
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R13 vs R13
Oregon has its own "specialty code" taken from the IRC prescriptive Code that Joe posted.
Always a good idea to check with the local AHJ. Notice R-15 is required below-grade walls, not listed R-13 on the other Code page.
http://energycode.pnl.gov/EnergyCodeReqs/?state=Oregon
http://ecodes.biz/ecodes_support/fre...Efficiency.pdf
Gary
__________________
Clothes taking longer to dry?
Clean the dryer screen in HOT water if using fabric softener sheets.
They leave a residue that impedes air-flow, costing you money.
Clean the ducting in the last six months? 17,000 dryer fires annually!
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01-18-2012, 02:13 PM
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#8
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Member
Join Date: Oct 2006
Location: Minneapolis/St. Paul, Minnesota - Latitude 45.057 Longitude -93.074
Posts: 3,334
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R13 vs R13
I think the OP was interested in doing the project properly and not to the typical code minimums or the pink panther way.
Dick
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01-18-2012, 10:46 PM
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#9
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Exterior Construction
Join Date: Aug 2011
Location: VA, MD, DC
Posts: 3,493
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R13 vs R13
Quote:
Originally Posted by concretemasonry
Just remember that R13 insulation in a wall gives you a wall much less than R13 (R10-11) because of the framing. Not like using XPS foam.
Dick
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+1
Actually less for that matter. Even if you figure that your framing leaves a net clear of 80%, that still makes for and R-7.5 average.
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01-18-2012, 10:55 PM
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#10
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Moderator
Join Date: Mar 2009
Posts: 8,786
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R13 vs R13
Good call, Dick. I'll get you started, don't use f.g.: The "biggest loser" in fiberglass insulation....
Gary
__________________
Clothes taking longer to dry?
Clean the dryer screen in HOT water if using fabric softener sheets.
They leave a residue that impedes air-flow, costing you money.
Clean the ducting in the last six months? 17,000 dryer fires annually!
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01-18-2012, 11:17 PM
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#11
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Member
Join Date: Oct 2006
Location: Minneapolis/St. Paul, Minnesota - Latitude 45.057 Longitude -93.074
Posts: 3,334
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R13 vs R13
Just don't complicate it and get into the problems with steel studs that really contribute to thermal short circuiting and loss of insulation between the studs.
Dick
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The Following 2 Users Say Thank You to concretemasonry For This Useful Post:
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