Insulation / Roofing Problem - Insulation - DIY Chatroom Home Improvement Forum

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


Thread Tools Display Modes
Old 03-15-2012, 03:27 PM   #1
Join Date: Mar 2012
Posts: 1
Rewards Points: 10

Insulation / roofing problem

I recently was part of a whole house renovation and the homeowner had closed cell foam insulation done in the entire house. The roofing used on this project is a basic GAF Timberline series with normal underlayment. About a year has gone by and the roof in three different places is starting to bubble, all on the same slope and all apx. the same distance from the ridge. I have never seen this condition before and there are no nails causing this. Has anyone ever heard of or seen this condtion. I read somewhere online that sometimes closed cell if done to thickly can actually retain heat for long periods of time and possibly cause this???? Any help would be appreciated.


fceneil is offline   Reply With Quote
Old 03-16-2012, 09:28 PM   #2
Registered User
Join Date: Mar 2009
Posts: 11,730
Rewards Points: 526

Solar driven moisture is what it sounds like, and it could go back to normal- over time/seasons, Fig.13, 14:

Foam against OSB is usually risky as it needs an air gap on one side (at least) to dry out because the product is hygroscopic;

The impermeable roofing shingles stop any moisture in the OSB from drying on one side, foam stops it on the other- “Practical Recommendations”, pp.5, second and third bullet:

Or it could be edge swelling, if it is that, may be irreversible:

And it could be none of the above---- did you check in the attic for a moisture source?



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.
17,000 dryer fires a year, when did you last clean the inside of the dryer near motor or the exhaust ducting?
Gary in WA 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
Help with complicated insulation project in attic OhmZoned Insulation 12 11-19-2011 08:49 AM
DIY sunroom stuck with roofing problem rbyham Roofing/Siding 12 08-09-2011 02:17 PM
Metal Roofing and Insulation bforrest13 Roofing/Siding 6 03-12-2011 08:06 AM
roofing and insulation question everyman Building & Construction 23 06-12-2009 07:32 PM
steel building insulation problem rjf Building & Construction 17 02-09-2007 06:24 AM

Top of Page | View New Posts


Search Engine Friendly URLs by vBSEO 3.6.1