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 01-29-2012, 07:56 AM   #1
Newbie
 
Join Date: Aug 2011
Location: Hyattsville, MD
Posts: 20
Share |
Question

Closed cell poly iso roofing material for residential


I recently acquired several 3 3/4" x 4' x 8' closed cell poly iso foam core faced with heavy black fiber-reinforced organic felt (non-asphaltic) on both sides. The brand name is AC Foam II. This material is apparently used to insulate commercial buildings with 'hot asphalt or coal tar BUR, modified bitumen, and single-ply membrane systems'. I was wondering if I can used it to insulate my pitched roof by putting it between the sheathing and roof shingles instead of cutting it to size and putting it on the inside between the rafters, which would lower an already low headspace in the attic even more. I know two big issues are getting fasteners long enough to reach the sheathing and covering up the exposed ends. Can this work?

kurtp2 is offline   Reply With Quote
Old 01-29-2012, 09:52 AM   #2
MarginallyQualified
 
Join Date: Dec 2011
Location: Winston-Salem NC
Posts: 3,656
Default

Closed cell poly iso roofing material for residential


Quote:
Originally Posted by kurtp2 View Post
3 3/4" x 4' x 8' closed cell poly iso foam core (@ 6-7 R per inch =R24)...
...putting it between the sheathing and roof shingles...
...putting it on the inside between the rafters,
Can this work?
How about laying it between/over the ceiling joists (or truss chord)?

TarheelTerp is offline   Reply With Quote
Old 01-29-2012, 09:56 AM   #3
Exterior Construction
 
Windows on Wash's Avatar
 
Join Date: Aug 2011
Location: VA, MD, DC
Posts: 5,911
Default

Closed cell poly iso roofing material for residential


You can do that is you decide to create a "hot" roof but you will need a nail-able base (another layer of plywood) applied to the top of the foam.

You should not use it and nail directly through the foam to attach the shingles. It never works properly that way.

Also, make sure you are applying a suitable thickness to the roof when you do it.
Windows on Wash is online now   Reply With Quote
Reply

Tags
ac foam ii, poly iso


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
Choosing The "Right" Roofing Contractor, How To Evaluate Who Is Right! Ed the Roofer Roofing/Siding 27 04-25-2013 05:10 AM
re: roofing material questions gramps416 Roofing/Siding 6 06-30-2009 03:42 PM
Roll roofing material RedDawg454 Roofing/Siding 8 05-03-2007 06:52 AM
closed cell insulation in attic Dennis Doucette Building & Construction 7 03-16-2007 09:08 PM
What roofing material is right for me? Grumpy Roofing/Siding 0 07-07-2004 07:41 PM




Top of Page | View New Posts

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