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george@DIY 02-02-2008 11:59 AM

Condensation In Attic
Hi all at DIY. I am a new forum member and this is my first post.

I had a new roof (shingles) put on my house. The old shingles were removed. The chimeney was also removed to the roof line and boarded over. (We had an energy efficient furnace put in a few years previously.)

Since the new roof, we have had condensation in the attic in the winter months. I can feel and see moisture on the roof boards and frost will form on the roofing nails that were driven through the roof.

I have had additional insulation installed and I installed additional vents under the sofit.

I am convinced that problem is with the chimeney. The top of the chimeney was not sealed off, simply removed to the roof line. The chimeney was wrapped with insulation.

You thoughts and feedback is greatly appreciated. Thanks.

concretemasonry 02-02-2008 12:21 PM

did you make sure your chutes between the rafters are completely open to take advantage of the new vents?

You could be losing heat and moisture up the old chimney if it was not sealed off. You should definitelt seal the old chimney top after you make sure the chimney does not have anything else coming into it.

Ed the Roofer 02-02-2008 01:04 PM

Explain in detail how much exhaust ventilation and intake ventilation you have now.

Saying that you added some intake vents does not say anything much to me.

What kind of and how many of each types of vents?

Do you have competing exhaust vents?

Ridge vents, mushroom vents, powered attic ventilator, or gable vents?

Also, the bottom of the chimney in the basement is probably allowing the moisture from the lower area to shoot up the chimney and then get ewxpelled into the attic copartment.


the roofing god 02-03-2008 10:36 PM

did you use unfaced insulation,putting faced insulation on top of faced can creaste a condensation problem,You should also check to see that your boiler,and dryer exhaust pipes are not routed to that chimney

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