Latest Discussions : Basement & Foundation


02:46AM | 04/15/06
Member Since: 04/14/06
2 lifetime posts
In winter the underneath of my metal roof developes condensation which is leaking onto my roof isulation. I have just installed a series of roof vents and also an extractor fan which vents to the outside and also an inside ceiling exhaust fan venting to the roof so i am just wondering if this will solve the problem?

It does seem to be happening when we have the log fire on in winter so i am hoping that the increased ventilation of the warm air from the roof will be enough. I did read somewhere that it's the warm air under the metal roof interacting with the cold air on the outside metal which causes the condensation, but have noticed that the carport roof which is not enclosed also suffers the same condensation problem with very little temp variation so if there is someone who can give me a simple solution, i would appreciate it.

Regards. Sharon.


12:00PM | 04/22/06
Member Since: 11/06/02
1278 lifetime posts
when the warm interior air ishumid ( almost always more humid than outside in winter) ciomes into contact with the cool surfacce of the metal, the moistur4e vapor condenses.

Proper ventiolation draws cool air in at the soffits and out at the ridge.

You are doing wrong by having warm house air blowing into the attic, You are adding moisture from the house to the attic so there is more moisture there to condense on the metal. The whole house cieling fan should be sealed off in winter

Excellence is its own reward!


01:20AM | 05/16/06
Member Since: 04/14/06
2 lifetime posts
Thanks for the good advice and have sealed off the ventilation entering the roof cavity from the interior so keeping my fingers crossed that this will solve my condensation problem.

Also installed a fan into the roof gable which draws outside air into the roof cavity to be exhausted through my whirly vents on the highest part of the roof so i think that should do the trick. "Lets hope"


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