Guest User
6/16/2015
2 years ago, I bought a 1-room 20x24' cabin, hand-built (read "unpermitted") in 1969, on pier and post, of single-wall tongue & groove redwood, with a corrugated iron roof, all of which is quite common in this area.. The roof is on 1x4s which are on 4x6 beams. There is nothing else - no insulation, ceiling, etc. It used to leak, but I applied 2 coats of Gardner Sta-Kool Cool Roof Elastomeric Coating, which stopped the leaks. Now I have noticed a serious increase in condensation (or it could be just the unusually wet weather we're having). If I could afford it, I'd just put on a new roof, but that is several years down the road in my budget. What would be the most cost-effective way to reduce the condensation? I live 4000' up the side of a volcano, so there can be a serious temperature gradient between night and day, from high 30's to low 80's. FYI: the 4x6s are 4 feet apart, the 1x4s 18-24" apart. (Told you it was hand-built... His hand-built windows are quite charming, however!)
Dick Bus
6/16/2015
Jude, it sounds like you need to have a balanced ventilation. Which means eave vents and a ridge vent.
Todd Miller
Classic Products, Inc.
6/16/2015
Thanks Jude. I second what Dick said. However, if ventilation is not possible, you might consider spraying the inside of the roof with closed cell urethane foam which will act as a vapor barrier and an insulator.
Info @windowsonwashington.net
An informed customer is our best customer.
6/16/2015
+1 Gotta get that warm moist air out before the overnight lows set in.
Jude Patrick
Alaskan expatriot in Hawaii
6/16/2015
Thanks for your comments. The roof is 1 slope, no ridge. There are eave vents, and my windows are usually open (from Alaska; I like the cold). Plus this cabin is in no way air tight. So ventilation isn't the problem. A dehumidifier would run all day and not make a difference. Any suggestions on a source for the foam? A lot of places won't ship to Hawaii, can't go by truck.. So far, I can't find any that will.
Info @windowsonwashington.net
An informed customer is our best customer.
6/23/2015
What is the humidity level like at night? You can spray foam it if you want but it will need to be covered with an intumescent barrier.

If you would like to reply to this thread, please log in. If you do not have an Ask the Experts forum user account, create one here.

Find a Contractor

Get Started Today

Take the first step to increasing the value of your home with a great looking, durable, fire resistant and energy efficient metal roof. Browse our list of qualified MRA Member Roofing Contractors in your area for a free consultation and estimate.