Remove Or Keep Basement Insulation - Remodeling - DIY Chatroom Home Improvement Forum
Advertisement


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

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

Like Tree2Likes
  • 1 Post By Windows on Wash
  • 1 Post By Windows on Wash
Reply
 
Thread Tools
Display Modes
Old 12-30-2017, 02:15 PM   #1
Newbie
 
Join Date: Dec 2017
Posts: 1
Default

Remove or keep basement insulation


Iím looking to finish our basement. Iíve got a couple questions that I canít find a clear cut answer on.

First- there is some insulation hanging on the top half of the foundation wall (photo attached). It is attached by a 2x4 onto the wall. Iím not sure if I should leave it up or take it down? If I leave it up, Iím probably looking at having the interior side of the finished wall 6.5-7 inches off the existing foundation wall (to clear that 2x4 and the insulation).

Related to the first question, I havenít found a good answer on whether or not to put up foam board on the wall before framing. Our local code doesnít say itís required. The house was built 3 years ago and we havenít had any problem with water. Iím located in central Iowa, so we do see a wide variety of weather conditions. Also, except for the top one foot, everything else is under ground. Is foam board or some sort of vapor barrier needed between the foundation walls and the framing?

Any input would be greatly appreciated. Thanks in advance!
Attached Thumbnails
Remove or keep basement insulation-975ed233-00b4-4bae-945e-98579869ae96_1514664751328.jpg  
ndwatne is offline   Reply With Quote
Sponsored Links
Advertisement
 
Old 12-30-2017, 04:06 PM   #2
Exterior Construction
 
Windows on Wash's Avatar
 
Join Date: Aug 2011
Location: Washington DC Metro Area (VA, MD, DC)
Posts: 20,317
Rewards Points: 4,322
Blog Entries: 38
Default

Re: Remove or keep basement insulation


Did the PSK and put rigid foam on the walls.

Seal the rim joists as well.

https://buildingscience.com/document...ts?full_view=1
Bud9051 likes this.
Windows on Wash is online now   Reply With Quote
Sponsored Links
Advertisement
 
Old 12-30-2017, 06:40 PM   #3
Member
 
Join Date: Apr 2017
Posts: 118
Rewards Points: 2
Default


don't know about where you live but in St Louis area and most other county's the foam board is against code, cause it gives off toxic fumes if there's a fire
ktmrider is offline   Reply With Quote
Sponsored Links
Advertisement
 
Old 12-30-2017, 07:15 PM   #4
Exterior Construction
 
Windows on Wash's Avatar
 
Join Date: Aug 2011
Location: Washington DC Metro Area (VA, MD, DC)
Posts: 20,317
Rewards Points: 4,322
Blog Entries: 38
Default

Re: Remove or keep basement insulation


Quote:
Originally Posted by ktmrider View Post
don't know about where you live but in St Louis area and most other county's the foam board is against code, cause it gives off toxic fumes if there's a fire
Foam board left exposed would be illegal in the entirety of the country.

The OP is finishing the basement here.
Bud9051 likes this.
Windows on Wash is online now   Reply With Quote
Old 12-30-2017, 08:09 PM   #5
Member
 
Join Date: Nov 2015
Location: Maine
Posts: 7,848
Rewards Points: 5,816
Default

Re: Remove or keep basement insulation


Hi nd and welcome to the forum.
Central Iowa is the dividing line between climate zones 5 and 6.
https://energycode.pnl.gov/EnergyCodeReqs/?state=Iowa
That link shows the 2009 IECC (energy conservation codes) but you need to check with your local building officials to determine what guidelines they are following.
But, the 09 is commonly used so you need something like r-17 to r-19 on the inside of those walls. A frequent approach would be an inch or so of rigid, framing against it, and cavity fill to meet total requirement. Since you have those 2x4's already in place (if they are pressure treated) you could leave them and use 1.5" rigid foam board above and below.

Now, rigid foam board with no plastic vapor barrier is considered a vapor diffusion retarder so will allow a small amount of drying to the inside (which is good). Using the rigid against the concrete will keep the inside surface above the dew point.

Leaving a space between the framed wall and the foundation risks air circulation carrying moisture from warmer bottom to colder top so place the framing directly against the rigid.

For the cavity insulation I like Roxul.

Bud
Bud9051 is offline   Reply With Quote
Sponsored Links
Advertisement
 
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
Sub Basement Insulation ken57 Insulation 0 11-13-2017 08:32 PM
Partial Basement Wall Insulation djbarber2 Insulation 3 11-05-2017 10:29 AM
Wet insulation in bathroom in basement goal80 Building & Construction 0 04-14-2013 09:21 PM
More basement insulation Bonzoso Insulation 4 11-22-2012 09:18 PM
Insulation in basement floor joists and integrated garage speedster1 Building & Construction 3 12-07-2010 05:44 PM




Top of Page | View New Posts