Jump to content

Recommended Posts

This is in the attic of a circa 1960's ranch. Multiple layers of composition shingle over plywood. The underside of the decking at the rear roof with northern exposure is stained black. more so toward the eaves. The south side is relatively clean. Any idea on what would cause this? First pic is south side, second is north side.

Click to Enlarge
tn_20135920825_130%20attic%20041.jpg

44.97 KB

Click to Enlarge
tn_20135920737_130%20attic%20040.jpg

52.43 KB

Link to post
Share on other sites

Hee, hee,

Stained black, you say? If that's black I'd hate to see what would happen to your senses after a few Northwest attics. I can hear ya now, "Somebody help me, I'm blind, I'm blind!"

ONE TEAM - ONE FIGHT!!!

Mike

Link to post
Share on other sites

Play fair, Mike. There is black around the nails, North and South.

The South-facing side warms up a bit in the sun, just enough to dry the wood out or reduce the amount of condensation.

The cause is usually warm moist indoor air leaking in to a cool attic space.

Link to post
Share on other sites

The good news is that the fix is cheap. A foot of cellulose will triple the R-value, affect enough air sealing to prevent any further condensation and staining, and present an adequate phisical barrier to keep all but the nosiest homeowners out of the attic. The vast majority of our cells jobs are under $2K.

Link to post
Share on other sites

I'm a believer. The jobs we've done where a cheap layer of cells is applied all magically improve and the problems go away.

I remember when we all thought the stuff was crap because it compressed. Who'da thought in 1982 that was a benefit?

Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

×
×
  • Create New...