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Old 09-22-2009, 08:24 AM   #16
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Condensation on cathedral ceiling


I'm almost positive that no decking was replaced with the re-roofing, but I'll ask him when I next speak with him.

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Old 09-22-2009, 12:01 PM   #17
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Condensation on cathedral ceiling


Reason being... It sounds as if youre missing some insulation at that point. Are you running your air conditioner?
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Old 09-22-2009, 12:08 PM   #18
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Condensation on cathedral ceiling


I've tried running my air conditioner, as well as leaving it off for several days. No impact on the ceiling sweat either way. Today we are supposed to have very hot, dry conditions. Humidity may fall under 10%. Will be interesting to see how that affects the problem. By late afternoon, I'll have no choice but to turn on the air conditioning, which will dry out the air even more.

Swine flu (no joke) still has me down for the count. Aaaaaargh!
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Old 09-22-2009, 03:48 PM   #19
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Condensation on cathedral ceiling


Yeah, flus are nasty every year.
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Old 09-23-2009, 09:00 PM   #20
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Condensation on cathedral ceiling


Go to page 6 of this brochure from Air Vent for your solution to the problem and the reasons why it is occurring.

http://www.airvent.com/pdf/literatur...s_HipRoofs.pdf

This previous thread also discusses, somewhat of a similar circumstance.

How to properly vent hip roof

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Old 09-23-2009, 09:14 PM   #21
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Condensation on cathedral ceiling


Ed, thank you, thank you, thank you!
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Old 09-23-2009, 09:37 PM   #22
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Condensation on cathedral ceiling


Is this a condensation issue on the interior or an attic condensation issue which is causing damage from the top of the ceiling drywall (attic side) to the bottom (living space side)?
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Old 09-23-2009, 09:43 PM   #23
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Condensation on cathedral ceiling


Hi Aaron. The condensation is appearing on my cathedral ceiling. There is no attic space whatsoever. The drywall is attached directly to the 2x6" rafters.

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Old 09-24-2009, 01:39 PM   #24
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Condensation on cathedral ceiling


In that case I really doubt venting that space would do any good under these conditions.

Can you provide any pics of the condensation?
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Old 09-24-2009, 07:56 PM   #25
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Condensation on cathedral ceiling


Aaron, I don't understand. Everything I've read has said that condensation on cathedral ceilings is caused by inadequate ventilation. If I don't try to vent the area between the sheathing and the drywall, then what other solution is there?
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Old 09-24-2009, 08:22 PM   #26
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Condensation on cathedral ceiling


inadiquate ventilation NEVER causes condensation...condensation is only cause by one thing...cooling of moisture laden air. You can remedy condensation with ventilation. The purpose of ventilation is removing warm air from the space.
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Old 09-24-2009, 08:45 PM   #27
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Condensation on cathedral ceiling


Quote:
Originally Posted by barbaraizac View Post
Aaron, I don't understand. Everything I've read has said that condensation on cathedral ceilings is caused by inadequate ventilation. If I don't try to vent the area between the sheathing and the drywall, then what other solution is there?
Don't let them get picky on semantics.

Unobstructed Intake To Exhaust Airflow, known as Ventilation is what is needed to mitigate the condensation symptoms.

Cathedral/Vaulted ceilings pose additional difficulties in creating enough flowage and even the skylight rafter-bay bypass is very rudimentary at best, but at least provides a viable option to consider, while weighting the costs incurred versus the risk of not doing it and the problems that you now know will occur.

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Old 09-24-2009, 09:08 PM   #28
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Condensation on cathedral ceiling


Ok, here's the scenario...

You have condensation on the INTERIOR of your home. The water vapor is condensing on ONE particular cold spot. Find out why this spot in particular is cold and remedy it.
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Old 09-24-2009, 09:10 PM   #29
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Condensation on cathedral ceiling


Quote:
Don't let them get picky on semantics.
There are no semantics involved in noting what condensation IS. The fact is that if warm moist air contacts a cold surface and reaches the dew point, it doesnt matter how much ventilation there is...you will get condensation. That's why there is a pan under evaparator coils.

The point is..as previously stated..that all the issues need to be addressed...not just ventilation. She needs some one to diagnose the problem on site. It's weird that it "just started" when she had the roof replaced.
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Old 09-24-2009, 09:13 PM   #30
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Condensation on cathedral ceiling


If you had an entire ceiling with condensation on it, I would tell you to insulate and add exhaust ventilation to your conditioned space.

Since it is only on ONE SINGLE SPOT on your ceiling (not in the rafter bays on the underside of the roofdeck) then ventilating the roof isnt going to do you one damned bit of good.

Why arent all you "roofers" thinking of such things????

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