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 07-04-2012, 10:20 AM   #1
Member
 
Join Date: Oct 2009
Location: Indiana, PA
Posts: 1,285
Share |
Default

Insulate attic walls that are against finished area


We have a large attic space that has one of the gable ends against the main house wall, this space gets very hot and cold, right now its 120 degrees in here... the wall it shares with the house of course warms up and heat radiates into the finished space.

the builders just stuffed R-19 fiber glass into the 2x4 wall, which doesn't fit well..

I am going to be replacing this with R-15 Roxul insulation since it deadens sound much better (the attic space works like a resonance chamber and amplifies road noise a bit)

after that I wanted to cover the wall with some type of insulated sheathing... was thinking Polyisocyanurate panels. would this be alright? that would add another R-10 and stop any bridging of heat and cold

BlueBSH is online now   Reply With Quote
Old 07-06-2012, 12:40 PM   #2
Member
 
Join Date: Oct 2009
Location: Indiana, PA
Posts: 1,285
Default

Insulate attic walls that are against finished area


no comments? :\

__________________
House Information: Build 1996, 1500 sq ft basement, 1500 sq ft 1st floor, 800 sq ft 2nd floor, 560 sq ft unfinished attic space on 2nd floor. Insulation: Attic blown fiberglass, walls R-19, Basement R-19. HVAC: Trane xc95m fully modulating furnace, single zone, Trane XL20i commiunicating AC unit, TCONT900 Communicating thermostat.
BlueBSH is online now   Reply With Quote
Old 07-06-2012, 12:57 PM   #3
Member
 
AGWhitehouse's Avatar
 
Join Date: Jul 2011
Posts: 1,378
Default

Insulate attic walls that are against finished area


the polyiso on the attic side? If so, that works thermally, but not for fire codes. You'll need to cover it with an ignition barrier or get a building official to sign off on it being left exposed. An ignition barrier could be plywood, sheet metal, or gypsum board...
__________________
Life's too short...so enjoy it!
AGWhitehouse is offline   Reply With Quote
Old 07-06-2012, 01:09 PM   #4
Member
 
Join Date: Oct 2009
Location: Indiana, PA
Posts: 1,285
Default

Insulate attic walls that are against finished area


Quote:
Originally Posted by AGWhitehouse View Post
the polyiso on the attic side? If so, that works thermally, but not for fire codes. You'll need to cover it with an ignition barrier or get a building official to sign off on it being left exposed. An ignition barrier could be plywood, sheet metal, or gypsum board...
yeah, it will be drywalled over, what I am more worried about would be what about it being faced, or in some cases it being sheething, one side is a reflective barrier, not sure on the specifics of where that is allowed to be placed or not..

energy auditor mentioned some of the newer houses around us where built with a reflective barrier used inproperly but forgot to ask how or why...

any ideas on what to do and not to do?
__________________
House Information: Build 1996, 1500 sq ft basement, 1500 sq ft 1st floor, 800 sq ft 2nd floor, 560 sq ft unfinished attic space on 2nd floor. Insulation: Attic blown fiberglass, walls R-19, Basement R-19. HVAC: Trane xc95m fully modulating furnace, single zone, Trane XL20i commiunicating AC unit, TCONT900 Communicating thermostat.
BlueBSH is online now   Reply With Quote
Old 07-06-2012, 05:49 PM   #5
Member
 
AGWhitehouse's Avatar
 
Join Date: Jul 2011
Posts: 1,378
Default

Insulate attic walls that are against finished area


Without being there and seeing, first hand, all variables I cannot give you a definitive direction here. I will say that many people have done what I think you're doing without any adverse effects....

If you take a section at a specific point in your wall you may find double barriers and all that mess, but it's really the system as a whole that needs to be looked at. Laboratory analysis only goes so far before mother nature plays a hand...
__________________
Life's too short...so enjoy it!
AGWhitehouse is offline   Reply With Quote
Old 07-07-2012, 07:35 PM   #6
Registered User
 
Join Date: Mar 2009
Posts: 9,968
Default

Insulate attic walls that are against finished area


1. Do you have a vapor barrier poly sheeting inside?

2. Is it just asphalt paper faced f.g. batt insulation? OR no facing at all? OR cellulose insulation?

3. Is the drywall air sealed (ADA)? How old is the house?

4. Why foil-faced or other, looking for the radiant aspect?

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 your attic Bob Mariani How To Guides 5 07-07-2013 08:49 PM
Cape Cod Style House Attic/Crawl Space Insulation Help Danielg Insulation 24 05-21-2012 08:20 AM
Finishing Basement Walls, Inside Perimeter Drains, and Moisture, Oh My BSponz1 Building & Construction 1 02-08-2011 01:20 PM
Insulate attic and between roof and closets scool Building & Construction 1 11-28-2010 02:36 AM
How to insulate attic crawl space RISurfer Building & Construction 7 10-01-2009 11:57 AM




Top of Page | View New Posts

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