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Old 05-10-2008, 11:23 PM   #1
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ceiling -wet and mold(fungi)


I have noticed some mold spreading on my room ceiling edges. Not all over the ceiling. only at the edge of the ceiling above outside wall.

I have replaced my roof ( it is brand new roof now), There are no roof leaks now as it is new roof.

What is the reason getting mold with my new roof.

I have heard that between roof and ceiling need to be well ventilated.
Do you think the reason is no ventilation between my new roof and ceiling.
I am not sure or cannot remember I had this problem with my old roof.
Your idea is highly appreciated. I am living in New Zealand.

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Old 05-11-2008, 12:27 AM   #2
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Mold is caused by water infiltration. If you have mold on your ceiling, your roof is probably leaking. You need to contact the company that installed it.

If there is no ventilation that is certainly a problem as well, or at least it would be a problem here in the states. It would be a code violation as well. I don't think humidity alone would cause visible mold on the ceiling, but stranger things have happened.

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Old 05-11-2008, 07:15 AM   #3
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Mpj could it be possible to post a few pictures of the problem area, One outside of the area of in question,
and some answers, 1. what type of roof is it shed,gable,flat ?. ( low pitch )
2. how close to the roof is the insulation in that area
3.does it get worse when the cold weather sets in. I,m not familiar with the climate of your geographic area, sorry.( if so , you might find that the insulation and vapor barrier could be missing in that area )
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Old 05-11-2008, 09:36 PM   #4
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roof pich is 15 degrees , this Zink aluminium, corogated.
Roof falling towards the wall and very close each other ceiling and roof where the mold is. This is new roof, I do not think roof is leaking.
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Old 05-11-2008, 09:45 PM   #5
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I'm Sorry I don't quit understand what your trying to explain. try again, maybe post a picture.
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Old 05-11-2008, 09:52 PM   #6
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My first thought was ventilation. What ventilates the space between the roof and the ceiling?
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Old 05-12-2008, 06:50 AM   #7
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mine too!
And a lack of insulation and vapor barrier in that location.
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Old 05-24-2008, 11:32 PM   #8
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Sorry I could not get back to you in time. Those are the pictures of ceiling attaching to this.
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ceiling -wet and mold(fungi)-trademe-027.jpg   ceiling -wet and mold(fungi)-trademe-028.jpg   ceiling -wet and mold(fungi)-trademe-029.jpg   ceiling -wet and mold(fungi)-trademe-030.jpg  
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Old 05-25-2008, 07:59 AM   #9
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mpj111,
From what I can see ,you have a condensation problem, roof is fine. did you have an asphalt roof before you went to tin.? could you post a picture of the outside roof and wall area in question, and the roof design also. this way I can guide you on how to fix this problem.
My first thought is that there is insufficient insulation in the area of question. but most important need to see the pictures that were requested. BOB
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Old 05-25-2008, 05:28 PM   #10
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*****From what I can see ,you have a condensation problem, roof is fine. did you have an asphalt roof before you went to tin.?*****


My roof was corrogated iron before, now replaced with same similar but zink-aluminum I think.
What you mean by "asphalt roof".

I have some condation problem too in the morning. Lot of condensation on inside the window glass in morning. Is that the cause of the problem ?
I will send some pictures of the roof in my next post.


Thanks
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Old 05-25-2008, 05:35 PM   #11
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The best thing to do is head up to your attic and have a look. I have a feeling your attic is not being properly ventilated. You should have a professional head up to your attic and have a look. It could be very steamy up there. Proper Ventilation could solve your problem.

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Old 05-25-2008, 09:32 PM   #12
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MPJ111 , If my Geography serves me correct, you should be getting into your cooler or colder season right now, correct?. which tells me your losing a lot of heat in that area up through your ceiling. if you cant get into that part of the ceiling cut open the ceiling install insulation baffles into the soffit and rafter bays up past the inside wall for about 2', then install R-13 or R-19 what ever you can get in the ceiling beam and rafter bay with out compressing it to tight to the sheathing. keep in mind you must maintain at least a 1" air space between the bottom of the sheathing and the insulation, that's what the baffle is designed to do.
next if you do not have any insulation in the attic i would install a R-30 in the ceiling. or if its all ready insulated get you self some R-19 or R-30 unfaced and roll it out across the ceiling beams.
the soffit must be vented and the ridge vented or gable. the idea is to keep the heat in the room and the attic air temp close to the outside temp. this will keep the roof sheathing from condensing from the heat that is being lost through the ceiling and dripping on the ceiling and running down the backside of the wall.
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Old 05-31-2008, 01:11 AM   #13
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thank you all, I will have a good look again.
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Old 05-31-2008, 08:11 PM   #14
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Quote:
Originally Posted by Sir MixAlot View Post
My first thought was ventilation. What ventilates the space between the roof and the ceiling?
After seeing those pics. Yes it's ventilation alright. You still have not let us know this important question. What ventilates the space between the roof and the ceiling?

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