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joe1973

02:05PM | 12/18/02
Member Since: 12/17/02
1 lifetime posts
Bvbasement
I found an unsual amount of moisture in an attic I was working in last week. I am curious to know what causes this and how can it be prevented. To help me better inform the homeowner. The plywood was saturated

LDoyle

01:09PM | 12/20/02
Member Since: 06/03/01
324 lifetime posts
Joe, sounds like either a leaky roof, leaky pipe and/or inadequate ventilation. Can't imagine just inadequate ventilation causing all that moisture problem, unless you live in a really humid climate. Check first for any obvious leaks (roof or water pipes) and then check for really good ventilation from under the eves all the way through the ridge. Could also be a leaky pipe in the walls and the excess moisture is traveling up into the attic. A really good inspection is in order.

Piffin

04:33PM | 12/28/02
Member Since: 11/06/02
1281 lifetime posts
I can do more than imagine it. I've seen it a number of times, always from inadequate ventilation. Once was where it was from a disconected dryer vent emptying into the attic. Another time it was where the owner openned the ceiling access to the atttic and left it open for two or three weeks in midwinter. It was twenty to fourty below zero and he was running a humidifier in the house. Not only was the plywood saturaterd, there were icicles hanging as much as three inches long. The drips from these in the warmer mid-day were making him think it was a leaky roof.
Mobile homes in extremely cold climates are often underinsulated and have a lot of excess condensation especially on north slopes and over bathrooms in the coldest part of winter

I suspect that the house you are on was built with less than adequate ventilation and/or your activity has allowed a great deal of warm moist air to move up into the attic.

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