DIY Home Improvement, Remodeling & Repair Forum > DIY Home Improvement > Insulation and Radiant Barriers > R25 Spray Insulation vs R40 Spray Insulation

Thread Tools Search this Thread Display Modes
Old 06-17-2010, 11:04 AM  
Junior Member
Join Date: Jun 2010
Posts: 1
Default R25 Spray Insulation vs R40 Spray Insulation

Is there really a noticeable difference?

Just bought a new home and the builder is charging an upgrade to go from R25 to R40 spray insulation in the garage.

It'll be my son's room (above the garage), so i just wanna know if it'll make a noticeable difference.

Thank you.

MCHammer is offline  
Reply With Quote
Old 09-07-2010, 03:45 PM  
Junior Member
Join Date: Sep 2008
Location: Pflugerville
Posts: 19

leave it, your garage shouldn't get to the extreme temperatures, and this is the floor of a bedroom you are talking about right?

AtticCare is offline  
Reply With Quote
Old 09-08-2010, 08:49 AM  
Supporting Member
Join Date: Nov 2007
Location: Grand Blanc, MI
Posts: 2,383
Liked 156 Times on 132 Posts
Likes Given: 71


In most cases, the garage WILL see extreme tempatures both in summer and winter however, R25 should be adequate insulation.
kok328 is offline  
Reply With Quote
Old 09-28-2010, 11:55 AM  
Junior Member
Join Date: Sep 2010
Location: venango
Posts: 3

what kind of foam is getting installed?
the difference in R value would be the thickness of foam applied.
make sure it is closed cell foam. open cell acts like a sponge.
One vendor's foam I've been using claims to be R7 per inch of thickness.
kelargo is offline  
Reply With Quote
Old 10-03-2010, 02:45 PM  
Senior Member
Join Date: Mar 2009
Posts: 363
Liked 28 Times on 26 Posts
Likes Given: 9


Kwik Build Panels - Insulation facts and misconceptions article

GBR is offline  
Reply With Quote
Old 10-07-2010, 01:00 PM  
Senior Member
Perry525's Avatar
Join Date: Apr 2010
Location: Lake Wales, Fl.
Posts: 115
Liked 11 Times on 7 Posts


The operative will spray by hand, he will guess how much foam he is depositing as he goes. If they are trying to make money, he will probably not spray it on to the correct depth, working on the assumption that no one will ever know.
Get a specification in writing, confirming exactly what you are getting for your money, stand there and watch him do it.

Note: spray foam will shrink by 15% over time!
About 15 years, confirm that the specification is for then, or now!
Where it does shrink back, you will have a cold patch/patches, which will be subject to condensation/damp and possibly mold in time.

Perry525 is offline  
Reply With Quote

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Similar Threads
Thread Thread Starter DIY Home Repair Forum Replies Last Post
spray vs roll painting joeyb General Home Improvement Discussion 5 02-18-2010 04:00 PM
REAL spray foam insulation for a DIY'er Turk Green Energy and Sustenance Living 7 06-14-2009 06:59 PM
Is there an algaecide I can spray on my A-coil? alkemyst HVAC 2 11-01-2007 07:19 PM
Spray on siding? fixitright Roofing and Siding 12 03-21-2006 10:13 PM
Is foam insulation or radiant barrier inas good or better than fiberglass insulation? MrsTopkat General Home Improvement Discussion 2 12-01-2005 09:11 AM

Newest Threads