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

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

Reply
 
Thread Tools Search this Thread Display Modes
Old 11-12-2012, 03:51 PM   #1
Member
 
Join Date: Oct 2011
Location: Cumberland County New Jersey
Posts: 49
Rewards Points: 0
Share |
Default

Floor and ceiling


I just purchased a bungalow that was used as a summer residence. The previous owner insulated the walls, but the ceiling is open rafters with 1x6 tongue and groove plank roofing (under tar paper and shingles) and has no insulation at all. The building is on a crawl space that is only about a foot high and for all intents and purposes, is inaccessible. I want to convert this to a year round residence and I'm thinking of using rigid foam insulation between the rafters to insulate the ceiling, but I don't know what to do about the floor, short of ripping it up to install insulation, which I'd rather not do. Does anyone have any suggestions? I live in New Jersey so it does get fairly cold here in the winter.

bpress54 is offline   Reply With Quote
Old 11-12-2012, 04:36 PM   #2
Member
 
funfool's Avatar
 
Join Date: Oct 2012
Location: Albuquerque NM
Posts: 702
Rewards Points: 4
Default

Floor and ceiling


rigid foam is good for some situations.
Problem is, only get about r-7 from it.
If your rafters are at least 2x4, rolled fiberglass will give you r-13.
2x6 rafter you can get r-19.
You want to get as much r value as you can, and rigid foam is not cheap.

__________________
If it was easy, we would not call it work!
funfool is offline   Reply With Quote
Old 11-12-2012, 04:43 PM   #3
Member
 
Join Date: Nov 2011
Location: Hartfield VA
Posts: 26,389
Rewards Points: 108
Default

Floor and ceiling


Most heat is lost out the windows and doors, next would be the walls and ceiling, last would be the floors.
joecaption is offline   Reply With Quote
Old 11-13-2012, 08:52 AM   #4
Exterior Construction
 
Windows on Wash's Avatar
 
Join Date: Aug 2011
Location: VA, MD, DC
Posts: 6,252
Rewards Points: 84
Default

Floor and ceiling


Quote:
Originally Posted by funfool View Post
rigid foam is good for some situations.
Problem is, only get about r-7 from it.
If your rafters are at least 2x4, rolled fiberglass will give you r-13.
2x6 rafter you can get r-19.
You want to get as much r value as you can, and rigid foam is not cheap.
Rigid foam gets you and R-7 per inch in some cases. The R-13 you are referencing is from 3.5" of fiberglass that also has no air barrier aspect or moisture barrier (if unfaced).

The best and easiest thing (usually equals the most expensive as well) would be to condition the crawl and spray foam the stem walls and the inside of the roof with CC SPF.

Vapor barrier and insulation layer in on shot.

You will still have cold rafters and they will be condensation locations but you could cover the rafters with a rigid foam and drywall the ceiling if you have already sprayed the rafters with foam.
Windows on Wash is offline   Reply With Quote
Old 11-13-2012, 10:53 AM   #5
Member
 
Join Date: Oct 2011
Location: Cumberland County New Jersey
Posts: 49
Rewards Points: 0
Default

Floor and ceiling


What do you mean by "condition the crawl space?" And what is a stem wall? I'm not familiar with that term. Thanks
bpress54 is offline   Reply With Quote
Old 11-13-2012, 11:56 AM   #6
Exterior Construction
 
Windows on Wash's Avatar
 
Join Date: Aug 2011
Location: VA, MD, DC
Posts: 6,252
Rewards Points: 84
Default

Floor and ceiling


If you search this forum, you will find a ton of threads on crawlspaces.

Windows on Wash 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





Top of Page | View New Posts

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