Floor Joist Insulation - Insulation - DIY Chatroom Home Improvement Forum

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


Thread Tools Display Modes
Old 10-17-2013, 04:18 PM   #1
Join Date: Dec 2011
Location: Philadelphia, PA
Posts: 96
Rewards Points: 165

floor joist insulation

Hi folks,

I was wondering what kind of insulation you'd recommend - if any at all - for the floor joists that are exposed in my basement.

in the winter, it gets pretty cold out here in PA and I'd like to do my best to keep the cold in the basement and the warmth up in the living spaces.

Here's some photos of my floor joists in my basement:


andrewjs18 is offline   Reply With Quote
Old 10-17-2013, 10:20 PM   #2
Exterior Construction
Windows on Wash's Avatar
Join Date: Aug 2011
Location: Washington DC Metro Area (VA, MD, DC)
Posts: 9,421
Rewards Points: 6,550

floor joist insulation

No need to insulated between conditioned floors.

Start researching on air sealing and insulation. That is where you are going to save money.


Windows on Wash is online now   Reply With Quote
Old 10-23-2013, 11:32 PM   #3
Registered User
Join Date: Mar 2009
Posts: 10,725
Rewards Points: 3,516

floor joist insulation

Right now the heat from the room above helps warm the basement, insulating there may cause your water lines to freeze. This depends on the amount of heat in the basement from the boiler ? and other HVAC equipment. I'd air seal all wiring/plumbing holes with fire-rated foam in the floor above, caulk the windows, etc.; http://www.google.com/url?sa=t&sourc...wWATQw&cad=rja

This will help stop the stack effect to the attic; http://www.wag-aic.org/1999/WAG_99_baker.pdf

Canned foam/Thermax the rims; http://www.buildingscience.com/docum...l_seal_rev.pdf

If looking for a warmer floor- full speed ahead;http://www.buildingscience.com/docum...n-crawlspaces/

If any ads are present below my answer or words underlined/colored, I do not condone/support/use the product or services listed/linked to, they are there without my consent.
WELCOME to the forums, if I forgot to say it!

Last edited by Gary in WA; 10-23-2013 at 11:34 PM.
Gary in WA is offline   Reply With Quote
Old 10-23-2013, 11:42 PM   #4
Retired from the grind
gregzoll's Avatar
Join Date: Dec 2006
Location: Midwest - Central Illinois
Posts: 15,617
Rewards Points: 4,710

floor joist insulation

None, unless you plan on finishing it for a home theater down there, or home office, and want to keep the upstairs noise down, from disturbing the person down there.

If you are having an issue with a cold house, then you need to direct your attention to sealing around Windows, Doors, electrical outlets, air sealing up into the attic space, insulating the attic, insulating around the perimeter of the basement Joist bays on all four sides.

You also need to introduce conditioned air into the basement, to help keep the upstairs also warm. That means a/c during the Summer if you have Central Air, and heat during the Winter, even if it only brings it up to say 59, it is better then going down there and finding burst pipes, because it got below 45.
Ren: Now listen, Cadet. I've got a job for you. See this button? Ren: Don't touch it! It's the History Eraser button, you fool! Stimpy: So what'll happen? Ren: That's just it. We don't know. Maybe something bad, maybe something good. I guess we'll never know, 'cause you're going to guard it. You won't touch it, will you?

Last edited by gregzoll; 10-23-2013 at 11:44 PM.
gregzoll is offline   Reply With Quote

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
Insulation question for vaulted home Talgonadia Insulation 3 08-22-2012 06:06 AM
?'s about foil-faced "bubble wrap" insulation badger73 Insulation 5 06-25-2012 05:09 AM
Several Insulation Quotes, Big Decisions to make knotquiteawake Insulation 2 05-04-2012 11:16 AM
Garage Insulation yamster Insulation 0 07-01-2011 01:30 PM
Rafter Vents and Insulation nofx1981 Roofing/Siding 15 03-10-2010 08:14 PM

Top of Page | View New Posts