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Old 09-24-2009, 08:15 PM   #31
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Condensation on cathedral ceiling


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Originally Posted by Ed the Roofer View Post
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.

Ed
Ed, how does venting the rafter space relate to this situation???!!!???!!!???
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Old 09-24-2009, 08:56 PM   #32
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Condensation on cathedral ceiling


No new decking was installed during the re-roofing.

Although the new roof was installed last winter, I never saw any signs of condensation until it got hot this summer. The skylight was installed in 1991 and never caused any problems with condensation. As I wrote in my first post, the only thing that has changed is that I now have one layer of composition shingle, whereas before there were two layers. Perhaps the additional layer acted as an insulator and lowered the heat build-up between the decking and the drywall? The skylight flashing is in good shape, so it's not causing any problems.

The problem undoubtedly exists under the entire section of roofing above my ceiling, and not just the area above the skylight. As described earlier, when I went up on the roof in the early morning, I found that ALL of the roofing above the cathedral ceiling was damp. The rest of my house has an attic space, and none of that roofing was damp at all. So even though I'm only seeing condensation above my skylight, where airflow is really restricted, I think the problem is occurring to a lesser extent throughout the entire ceiling.

I really am down with the swine flu. No joke. Once I'm no longer contagious, my contractor friend is going to come over and give me his assessment of the problem, along with what he thinks about the roofer's idea for resolution (which right now is to just drill holes under the eaves). I think a ridge vent will also be required, as well as holes drilled into the bays around the skylight as suggested by Ed.
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Old 09-24-2009, 09:23 PM   #33
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Condensation on cathedral ceiling


good plan..gws
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Old 09-24-2009, 09:30 PM   #34
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Condensation on cathedral ceiling


How cold was it outside when you found that you had dew on your area above this ceiling? Was the air conditioner running? What was the relative humidity and barometric pressure? Does this occur even in winter? Are you getting interior condensation on the rest of the cathedral ceiling as well as above the skylight? What time of year was it when you checked the roof? Are you in a mountainous area? There IS a drywall ceiling, correct?
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Old 09-24-2009, 09:31 PM   #35
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Condensation on cathedral ceiling


Is there condensation on the inside in the morning on days when the roof above this section is wet and the rest of the roof is not?
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Old 09-24-2009, 09:35 PM   #36
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Condensation on cathedral ceiling


The reason I ask is IF you have a situation whereas the moisture is from vapor drive instead of condensation, then water vapor drives from hot to cold. This is why only true vapor barrier membranes (below 1.0 perm) will stop "leaks" on freezers.

I am trying to consider all possibilities, and pictures with time stamps and ambient temperature readings both inside and out with all of the above conditions noted would help a LOT.
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Old 09-25-2009, 08:19 AM   #37
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Condensation on cathedral ceiling


I live in Southern California less than a mile from the ocean. The relative humidity is usually around 65%. I first noticed the condensation on the sloped ceiling above the skylight (approx 2x2' evenly distributed) about three months ago. No condensation appeared anywhere else in the room. I wasn't using the air conditioner at all then. The shower is tiny in the master bath, so I use another bathroom for showering. I find the condensation above the skylight every morning. By the end of the day, it's almost entirely dried out. This happens every day, whether I use the air conditioner or not. I sleep with the skylight and windows open every night.

I went up on the roof a week ago today. The roofer was there to install an O'Haven roof vent above the skylight (which failed to correct the problem). That's when we saw that the entire roof over the cathedral ceiling was damp. Interestingly enough, that section of roofing also covers the master bath, and the roof was dry above the bathroom area. The bathroom does NOT have a cathedral ceiling, so it has attic space above it.

I did notice that there are holes drilled under the eaves over the bathroom area for ventilation, but there are no ventilation holes under the bedroom eaves (lower end of slope).

Right now Southern California is experiencing extremely dry winds and air, so the drywall on my ceiling, while still getting damp, isn't looking nearly as wet as it usually does. I'm definitely feeling better today, so as soon as the sun comes up, I'll go up on the roof and see how wet it looks. I'm sorry to say that I don't have a digital camera, so I can't take any pics. Oh, and the roofer used a 30lbASTM felt underlayment. The slope is 3/12.
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Old 09-25-2009, 08:34 AM   #38
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Condensation on cathedral ceiling


Forgot to answer the question about the outside temp the morning I discovered the damp roof. It was probably 65-68 degrees, as it is most of our summer mornings. Our highs are usually around 85 in the summer, and other than the last couple of weeks of scorching heat, we've had typical summer weather.
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Old 09-25-2009, 08:54 AM   #39
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Condensation on cathedral ceiling


Just went up on roof and found that it's damp over the entire house. The marine layer is really heavy this morning. I checked the humidity, and it's 90%. The temp is 62 degrees. Yesterday's high was 92, and the humidity was down to 35%. Bizarre weather for us.
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Old 09-25-2009, 04:34 PM   #40
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Condensation on cathedral ceiling


And no air conditioning nor heat is on, correct?
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Old 09-25-2009, 06:48 PM   #41
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Condensation on cathedral ceiling


Correct; no heating or air conditioning is on.
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Old 09-26-2009, 12:30 PM   #42
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Condensation on cathedral ceiling


Hello,

Another possibility is that with the products available today, your roof "tightened up",or it is not letting the roof breathe out through the felt and shingles.
It is possible that even with two layers it still was able to breathe before.

Just a thought.

Keith
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Old 09-26-2009, 01:28 PM   #43
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Condensation on cathedral ceiling


Go back to vacation, Steinke. J/K :-)
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Old 09-26-2009, 01:32 PM   #44
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Condensation on cathedral ceiling


The exterior dew is not associated with this situation except whereas it evaporates off the attic areas sooner than the cathedral area because it is generally warmer in the attic areas, advancing the evaporation.

Condensation in the attic or rafter areas is not so much associated with interior condensation, either.

It still sounds to me as if you are missing insulation at that area. Back when I allowed smoking on the roof, someone had dropped a burrning butt into the insulation, requiring us to remove the decking and remove n replace the insulation. This is just one scenario that I have witnessed. Smoking is no longer allowed on my roofs.

Check this area for insulation, and make sure that if it is there, it is ample.
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Old 09-26-2009, 06:01 PM   #45
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Condensation on cathedral ceiling


Thanks for the insight as to why the entire roofing over the sloped ceiling was wet. That makes a lot of sense.

My late husband's good friend, who is a building contractor, is coming over Monday to check things out for me. I'll have him cut out a small piece of drywall above the skylight to check out the insulation. On Tuesday I'll be on a cruise ship to Cabo with 7 firefighter wives. Mexico will never be the same.
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