Go Back   DIY Chatroom Home Improvement Forum > DIY Repair > General DIY Discussions

CLICK HERE AND JOIN OUR COMMUNITY TODAY...IT'S FREE!

Reply
 
Thread Tools Search this Thread Display Modes
Old 02-21-2010, 11:12 PM   #1
Member
 
Join Date: Sep 2009
Posts: 46
Share |
Default

insulation touching concrete in basement


Im framing my walls in my basement, the exterior first.Im useing metal framing and i want to 2 1/2 studs to give me more sq footage.My question is if i do that and leave myself some space behind for clearance,then use 3 1/2 batt insulation it will touch the concrete,im thinking that will be a problem in the long run.

THX

ron0805 is offline   Reply With Quote
Old 02-22-2010, 09:09 AM   #2
Member
 
Join Date: Jan 2009
Location: South of Boston, MA
Posts: 17,248
Default

insulation touching concrete in basement


You do not want the fiberglass insulation touching the basement walls
Ideally you want 1" of air space behind the insulation
Or use rigid foam boards up against the basement walls...then studs

Scuba_Dave is offline   Reply With Quote
Old 02-22-2010, 12:49 PM   #3
Drywall contractor
 
Join Date: Jul 2008
Location: Lilburn, GA
Posts: 2,091
Default

insulation touching concrete in basement


And by compressing the 3-1/2" insulation into the 2-1/2" cavity you would actually lose R-value....
__________________
If you can read this, thank a teacher. If you can read this in English, thank a soldier. Support our troops.
bjbatlanta is offline   Reply With Quote
Old 02-22-2010, 01:13 PM   #4
Newbie
 
Join Date: Feb 2010
Location: Florida
Posts: 16
Default

insulation touching concrete in basement


Just curious, why is it a problem if the insulation touches the basement floor?
seawiz is offline   Reply With Quote
Old 02-22-2010, 09:37 PM   #5
Newbie
 
Join Date: Jan 2010
Location: Nebraska
Posts: 18
Default

insulation touching concrete in basement


You might want to read this before you get started. I would NOT use fiberglass! You will just end up with mold!

http://www.homeconstructionimproveme...#comment-36170

http://www.eere.energy.gov/buildings...s/db/35017.pdf
soasquad is offline   Reply With Quote
Old 02-22-2010, 11:25 PM   #6
Registered User
 
Join Date: Mar 2009
Posts: 9,968
Default

insulation touching concrete in basement


"use 3 1/2 batt insulation it will touch the concrete,im thinking that will be a problem in the long run." ----- correct: http://www.swinter.com/services/docu...Insulation.pdf

http://www.buildingscience.com/docum...gs?full_view=1

No air space behind the insulation: http://oikos.com/library/insulating_...lls/index.html Glass batt relies on the small air spaces to work properly. A bigger space allows air currents to form defeating the whole idea of still air. AND, fire-stopping is required every 10' horizontally and vertically, per safety code.

Be safe, Gary

__________________
If any ads are present in my answer above, I do not condone/support/use the product or services listed, they are there against my permission.
Gary in WA is offline   Reply With Quote
Reply


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
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Basement Insulation and humidity control mcwolfe6 General DIY Discussions 11 01-28-2010 06:02 PM
Basement insulation lenkaj General DIY Discussions 2 01-19-2010 07:38 PM
Insulation for Concrete Basement Walls soundman79 Building & Construction 8 07-15-2009 01:54 PM
basement insulation advise needed bmartin5150 Building & Construction 1 04-27-2009 04:56 PM
insulation b/ween concrete and gravel in live-in basement amakarevic Building & Construction 6 08-15-2007 12:02 PM




Top of Page | View New Posts

Copyright © 2003-2014 Escalate Media. All Rights Reserved.