Basement Insulation Question

07-07-2011, 12:36 PM	#1
ctote Member   Join Date: Jul 2011 Location: Virginia Posts: 36	Basement Insulation Question Is FORMULAR 150, 1" thick with a rating of R-5 enough for a standard walk-out basement? Will be gluing directly to the block. Should I go with 2"?

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07-08-2011, 08:30 AM	#2
ccarlisle Member     Join Date: Jul 2008 Location: Montreal, Quebec, Canada Posts: 1,763	Basement Insulation Question Depends on where you are. Not enough for Fairbanks, too much for Atlanta...

07-08-2011, 09:12 AM	#3
ctote Member   Join Date: Jul 2011 Location: Virginia Posts: 36	Basement Insulation Question Southwest Virginia

07-09-2011, 07:32 PM	#4
Gary in WA Moderator   Join Date: Mar 2009 Posts: 8,789	Basement Insulation Question You are in Zone 4A: http://publicecodes.citation.com/ico...001_par001.htm You need 2" for minimum Code of R-10 (continuous) -footnote "c": http://publicecodes.citation.com/ico..._11_sec002.htm 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!

07-15-2011, 02:26 AM	#5
design_lover13 Member   Join Date: Jul 2011 Location: Saskatoon Posts: 30	Basement Insulation Question 2 inch would be preferable in most northern states or Canada. So long as it doesn't present a problem for your design plan, then go for it! Worth the expense. Last edited by design_lover13; 07-15-2011 at 02:30 AM.

07-20-2011, 08:55 AM	#6
ctote Member   Join Date: Jul 2011 Location: Virginia Posts: 36	Basement Insulation Question So if I go with 2" from Home Depot (about $30 for 4x8 board) I'm looking at around $795 ... for the 3/4" tongue-and-groove (about $14.20 for 4x8 board) I'm looking at around $375. Any estimates on how long it will take to make that additional $400+ back in energy savings?

07-20-2011, 11:15 AM	#7
AGWhitehouse Architectural Designer     Join Date: Jul 2011 Location: Connecticut Posts: 1,365	Basement Insulation Question Quote: Originally Posted by ctote So if I go with 2" from Home Depot (about $30 for 4x8 board) I'm looking at around $795 ... for the 3/4" tongue-and-groove (about $14.20 for 4x8 board) I'm looking at around $375. Any estimates on how long it will take to make that additional $400+ back in energy savings? No way of telling for sure without running an energy model, but my guess is that over the life of the product you will at least double, if not triple, your investment with whichever one you choose to do.

07-21-2011, 12:19 PM	#8
Gary in WA Moderator   Join Date: Mar 2009 Posts: 8,789	Basement Insulation Question I agree with AGWhitehouse, above. Here are some figures on foam board and heating in a basement for a little comparison of savings generated; http://www.quadlock.com/technical_li...Insulation.pdf And the basics on thickness of board;http://www.buildingscience.com/docum...lation-systems http://www.eere.energy.gov/buildings...s/db/35017.pdf Explore this one, using "back" key; http://www.buildingfoundation.umn.ed...timum-main.htm 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!