Go Back   DIY Chatroom Home Improvement Forum > Home Improvement > Building & Construction

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

Reply
 
Thread Tools Search this Thread Display Modes
Old 01-29-2011, 06:15 PM   #1
Member
 
Join Date: Dec 2010
Posts: 35
Rewards Points: 25
Default

Insulating Floor Joists


Hi All,

My house is a raised bungalow. Garage is on the left and the house and basement is on the right. There is an entrance splitting the two parts of the house. When you walk in the front of the entrance the rear door is straight ahead, with a door to the garage on the left.

My entrance is always freezing cold in the winter. The floor is really cold and I believe its mainly because there is a cubby directly below has the exposed brick foundation and floor slab, neither which is insulated as there is no carpet or drywall. Obviously I'll keep it that way for cold storage, however I would like to insulate the floor joists under this section to help keep my entrance above warm.

Please see the attached photos for reference.

I would like to just insulate it like its a studded wall, however I'm not sure if this is a good method. I say this as normally you vapor barrier on the warm side, but the warm side will be the bottom of the plywood in this case.

Ref Floor Joists 2 x 8 x 16 OC

I don't know if I can rent a insulator sprayer cause I assume that method will be recommended.

Does anyone have any suggestions?

1 Home Layout.JPG (21.9 KB)
2 Looking into the Entrace.JPG (70.2 KB)
3 Entrance Going Down Stairs.JPG (84.0 KB)
4 Under Rear End of Entrance.JPG (62.8 KB)
5 Floor Joists Under Rear Entrance.JPG (66.9 KB)
6 Under Front of Entrance.JPG (54.4 KB)
Attached Thumbnails
Insulating Floor Joists-1-home-layout.jpg   Insulating Floor Joists-2-looking-into-entrace.jpg   Insulating Floor Joists-3-entrance-going-down-stairs.jpg   Insulating Floor Joists-4-under-rear-end-entrance.jpg   Insulating Floor Joists-5-floor-joists-under-rear-entrance.jpg  

Insulating Floor Joists-6-under-front-entrance.jpg  

trophywalleye is offline   Reply With Quote
Old 01-29-2011, 06:16 PM   #2
Member
 
Join Date: Dec 2010
Posts: 35
Rewards Points: 25
Default

Insulating Floor Joists


Last Photo
Attached Thumbnails
Insulating Floor Joists-7-floor-joists-under-front-entrance.jpg  

trophywalleye is offline   Reply With Quote
Old 01-29-2011, 11:00 PM   #3
Registered User
 
Join Date: Mar 2009
Posts: 9,967
Rewards Points: 2,000
Default

Insulating Floor Joists


Insulate the rim joists and insulate the floor; http://www.rd.com/57548/article57548.html

http://www.buildingscience.com/docum...n-crawlspaces/
And cover the foam board; http://www2.iccsafe.org/cs/committee...E_06_64_07.pdf
Insulate that pipe, if a heat supply.

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
Old 01-30-2011, 01:41 AM   #4
Contractor - Renovations
 
fungku's Avatar
 
Join Date: Jul 2008
Location: Vancouver
Posts: 260
Rewards Points: 250
Default

Insulating Floor Joists


you can insulate the floor or the foundation walls.

it is common here to insulate the foundation walls and heat it the crawlspace, instead of insulating the floors. The reason is because of water supplies come up through the crawlspace.

If it were my house I would consider VB & insulation on the foundation walls and rim.
-if you have uninsulated and unsealed heat ducts running through the crawlspace, then it would be considered "heated".

edit: in what region do you live?

Last edited by fungku; 01-30-2011 at 01:57 AM.
fungku is offline   Reply With Quote
Old 01-30-2011, 02:49 AM   #5
Member
 
Join Date: Jun 2008
Location: Maryland
Posts: 59
Rewards Points: 75
Default

Insulating Floor Joists


Quote:
Originally Posted by GBR in WA View Post
Insulate the rim joists and insulate the floor; http://www.rd.com/57548/article57548.html
Gary
This link isn't working for me
mjzraz is offline   Reply With Quote
Old 01-30-2011, 09:26 PM   #6
Member
 
Join Date: Dec 2010
Posts: 35
Rewards Points: 25
Default

Insulating Floor Joists


I live in North Eastern Ontario.

I do not want to insulate the basement slab floor or brick walls. I plan on keeping this a cold room, even if that means I need to insulate the hot air ducts.

I do however want to make sure the floor upstairs is warm. My newly acquired home seems like there's lots of little things that require improvement to make this a more energy efficient and warm house. For instance, I noticed that whoever installed the sliding doors in our bedroom, shimmed the doors but did not foam the cracks, and just put the floor trim on. The cold air that blows into our house is unbelievable there. I tried my best to foam it, but the idiots who shimmed it, shimmed on two levels, the top (directly under the door) was spaced so I could foam it, but the bottom shims are spaced so tiny that I can't foam it... Plus spray foam does not work well in the cold. Makes me wonder what else is going on. I noticed that none of the heating ducting is taped at the joints. Sigh...

So the final conclusion on my entrance floor temperature issues is...

Josh
trophywalleye is offline   Reply With Quote
Old 01-31-2011, 12:15 AM   #7
Contractor - Renovations
 
fungku's Avatar
 
Join Date: Jul 2008
Location: Vancouver
Posts: 260
Rewards Points: 250
Default

Insulating Floor Joists


Quote:
Originally Posted by trophywalleye View Post
I live in North Eastern Ontario.

So the final conclusion on my entrance floor temperature issues is...

Josh
If you don't want to insulate the foundation walls, then insulate your floors and ducts.

I like figure 7 in the building science link that GBR posted. You should probably read that page.

and I think you need a minimum R28 in a floor.

Last edited by fungku; 01-31-2011 at 12:19 AM.
fungku is offline   Reply With Quote
Old 02-01-2011, 12:53 AM   #8
Registered User
 
Join Date: Mar 2009
Posts: 9,967
Rewards Points: 2,000
Default

Insulating Floor Joists


Apparently that link doesn’t link….. Info-408: Critical Seal (Spray Foam at Rim Joist ) — Building ...

http://www.eere.energy.gov/buildings...s/db/35379.pdf

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
Insulating furnace/utility area cbrc5eric Building & Construction 3 04-30-2010 01:03 PM
Options for insulating a concrete block house Ptron Building & Construction 7 04-05-2010 04:55 PM
Insulating basement ceiling - your recommendations? jtmann HVAC 8 11-24-2009 05:44 PM
Insulating brick above & close to grade Peter Shepherd Building & Construction 1 09-16-2009 07:41 AM
Insulating crawl space jenoble99 Building & Construction 10 06-18-2009 01:09 PM




Top of Page | View New Posts

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