Roof Wet on One Side, Dry on Other Side

Old 01-22-01, 03:37 PM
Visiting Guest
Posts: n/a

Hoping someone will be able to provide info on what would cause one entire side of roof (north-facing) to have wet wood underneath with other entire side (south-facing) having normal (dry) wood. It's a small house, each roof side being only 36' wide and 16' from gutter-level to top of roof. There has been no leaking water into house below, but there is too much dampness on the wet side for comfort. Thank You!!! for any ideas on how to best correct this problem. I think rain may come in during gusts at very top part of roof, but roof looks good with only 2 - 3 exceptions, which I have repaired. I think it'll take a couple weeks of 90+ temps to dry the wood on damp side of roof....... Again, many thanks for your help.
Old 01-22-01, 04:22 PM
Join Date: Mar 2000
Location: Arlington, WA
Posts: 8,670
Upvotes: 0
Received 1 Upvote on 1 Post
What you are seeing is condensation on the underside of the roof sheathing. The south side is dry because that side is pointing almost directly at the sun, therefore the roof is warmer. The north side of the roof never gets direct sunlite. The condensation is caused from heat escaping from your home into the attic. How much insulation is in the attic? You probably need more.
Old 01-25-01, 04:58 PM
Visiting Guest
Posts: n/a
Thumbs up roof wet on one side dry on the other

Another reason it could be is there might not be a layer of FELT paper between your roof deck a your roofing material,whether it's fiberglass shingles or what ever.
At the top of your roof take a flat bar and gently lift a couple of tabs in diferent places.
If thats not the case you might want to have a ridge vent install along your ridge.
I suggest Cobra vent.It's a mesh appr.1" thick and about 16" wide.
You remove the old caps,cut a 1" strip of roof deck from the ridge,approx.24" in from both sides of gable peak,
roll out cobra vent,over lapping the last cap you left on at the 24" mark on either side of roof,when nailing down with 2" roofing nails try to catch a rafter and don't nail it home,just enough so the top of the nail head hits the vent

good luck!

Thread Tools
Search this Thread
Ask a Question
Question Title:
Your question will be posted in: