Should I Insulate This ? - Insulation - DIY Chatroom Home Improvement Forum


Go Back   DIY Chatroom Home Improvement Forum > Home Improvement > Insulation

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

Reply
 
Thread Tools Display Modes
Old 06-15-2011, 09:21 PM   #1
Member
 
Join Date: Apr 2011
Posts: 38
Rewards Points: 25
Default

Should I insulate this ?


22'X30' addition- crawl space only. Block foundation walls.
I have installed 4'x8' sheets horizontally, of O Corning 2" foam board along entire inside of block wall foundation.
Do I now need to insulate between the 16"OC I Joists, or is the crawl space now insulated enough ?

Advertisement

stymie222 is offline   Reply With Quote
Old 06-16-2011, 08:11 AM   #2
Member
 
Join Date: Aug 2009
Location: South Carolina
Posts: 284
Rewards Points: 250
Default

Should I insulate this ?


Where are you located? At least down south, if you put fiberglass or even open cell spray foam in between the joists they will hold moisture and will not hold up and eventually could cause rotting unless you create an air tight seal around it. If you've completely sealed up the walls with insulation, you'll probably want to put down a moisture barrier along the ground.

Advertisement

autx790 is offline   Reply With Quote
Old 06-16-2011, 08:20 AM   #3
Member
 
Join Date: Apr 2011
Posts: 38
Rewards Points: 25
Default

Should I insulate this ?


Live in Iowa. Very cold winters.
Would 6" thick batts be adequate for 9 1/2'" I joists, or go for the 9 1/2" batts ?
I don't know if this info is right- The Mid American energy consultant said I didn't need the I joists insulated if I installed the foam board. Kind of shook my head on that one.

I will put down 6mil poly on entire floor.

Thanks for the reply.
stymie222 is offline   Reply With Quote
Old 06-16-2011, 09:17 AM   #4
Member
 
Join Date: Aug 2009
Location: South Carolina
Posts: 284
Rewards Points: 250
Default

Should I insulate this ?


If the space is now sealed up i'm not sure how much gain you receive in insulating between the joists. I just know that if your going to seal up your crawlspace but dont put a membrane down on the ground, you will get moisture coming up from the ground.

You could read the info here on crawl spaces, they have some good info on how best to do all this.
http://www.buildingscience.com/resou...nd-crawlspaces
http://www.buildingscience.com/docum...ance-and-codes
autx790 is offline   Reply With Quote
Reply


Thread Tools
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
Insulate basement header with imbedded joists??? lackofunds General DIY Discussions 21 04-17-2011 04:41 PM
To insulate or not to insulate? brokenhammer Building & Construction 2 11-24-2010 07:10 AM
to insulate or not to insulate? tiffertots Building & Construction 0 10-20-2010 12:13 PM
How to Insulate behind Wall Stack Supply Duct whirly HVAC 5 03-08-2010 05:47 PM
Insulate or Don't Insulate? helpless handyman Building & Construction 10 03-31-2008 07:07 PM




Top of Page | View New Posts