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Alltypes (Alltypes)
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Username: Alltypes

Post Number: 1
Registered: 08-2018
Posted on Thursday, August 23, 2018 - 11:24 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only) Ban Poster IP (Moderator/Admin only)

You may need a plumber!
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Oldslate (Oldslate)
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Username: Oldslate

Post Number: 1
Registered: 07-2017
Posted on Saturday, July 22, 2017 - 11:35 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only) Ban Poster IP (Moderator/Admin only)

We recently moved into a 1920s house with a mostly finished small attic - there is one open room, open to the stairs, and one cedar closet on the other side of the stairs that has a door. There are two strong gable fans in the two crawl spaces. We just had central air installed in the home (with the air handler in one of the attic crawl spaces), and we are conditioning the open room (not the cedar closet).

We have recently noticed condensation stains on the sloped ceilings of the open room, which we believe may be caused by one or several of the following:
1. there is no gap between drywall, insulation, and roof;
2. the attic ceiling drywall goes right up to the peak of the roof, but there is a flimsy covering at the apex there where the lights are that is not completely sealed from the peak, so warm air escapes from there into the room;
3. the crawl space where the air handler is is separated from the open room by a door that is not sealed very well, and the gable fan in that crawl space is very strong/designed for a larger area (appx 1000 Sq ft).

We are wondering what to do at this point. The walls are not wet by any means. We just see shiny spots on the ceiling up by that gap by the peak; we think the hot humid air from the peak of the roof is being sucked down into the conditioned space by the strong gable fan, hitting the cool conditioned ceiling/walls, and condensing. (So, we turned off the fans a couple of days ago, which leaves our crawl spaces pretty warm). Our main concern is mold and rot. Although we have been told by a couple people that mold is not a concern at this point - not sure about that.

I had read on this forum from and old post that someone had packed everything tight with insulation all the way up to the peak when finishing attic space and had no problems. This leads me to think perhaps if we just seal up that peak area of the finished ceiling so that there is no longer a gap for the hot air to come into the conditioned space, we will solve our condensation problem on the ceiling. But not sure if the slate is breathable enough to let that hot air out through the roof then, and if not, where is that heat going?

I'm wary of tearing the walls and insulation in the attic down to add baffles. But if that's the only option...

Also there are no soffit or ridge vents that I can see. We have no eaves. So not sure if baffles or air space between insulation and roof are still helpful if there are no inlet and exhaust vents for the air.

Many thanks for all help! Sorry for the long post.

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