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Old 03-19-2014, 06:39 PM   #1
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Frost covering the inside of my roof this winter?


The inside of the attic was covered in a thick layer of frost this winter, when it melted it leaked and got the roof wet. Why would this happen, i have been living here for five years and it hasn't happened before. I recently last summer got new shingles put on my roof. What would cause this and how do i fix it?

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Old 03-19-2014, 06:46 PM   #2
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Frost covering the inside of my roof this winter?


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Originally Posted by kenny111 View Post
The inside of the attic was covered in a thick layer of frost this winter, when it melted it leaked and got the roof wet. Why would this happen, i have been living here for five years and it hasn't happened before. I recently last summer got new shingles put on my roof. What would cause this and how do i fix it?
The cause is the attic dew point temperature being too high. One solution to fix is to stop exhausting bath fan air into the attic.

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Old 03-19-2014, 06:48 PM   #3
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Frost covering the inside of my roof this winter?


i checked the connection of the exhaust fan from the bath room. It is connected and vents direct to outside with no leaks.
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Old 03-19-2014, 07:03 PM   #4
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Frost covering the inside of my roof this winter?


Most often caused from not enough roof and soffit venting, attic not air sealed, and not enough insulation.
No one has a clue where you live because there's no location in your profile.
Going to quick links to edit would be a big help.
http://www.energystar.gov/index.cfm?...sulation_table
Air sealing is sealing up anyplace wiring, plumbing, ceiling fixtures where run into the attic.
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Old 03-19-2014, 07:06 PM   #5
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Frost covering the inside of my roof this winter?


+1

Need more venting and balanced venting.

Air sealing is going to help with the moisture transfer.
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Old 03-19-2014, 07:16 PM   #6
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Frost covering the inside of my roof this winter?


What do you have now for roof and soffit venting?
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Old 03-19-2014, 07:26 PM   #7
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Frost covering the inside of my roof this winter?


Asphalt and individual soffits under the eaves.
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Old 03-19-2014, 07:50 PM   #8
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Frost covering the inside of my roof this winter?


That does not tell us much.
What types roof vents, gable, ridge vents?
Just a few soffit vents is not going to cut it.
If they have been painted over, cover with insulation there useless.
Picture sucking on a straw with your finger over the end of it.
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Old 03-20-2014, 01:50 AM   #9
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Frost covering the inside of my roof this winter?


http://www.buildingscience.com/docum...bout-diffusion

http://www.energysaversny.com/frost_-_moisture

Gary
PS. Welcome to the forums!

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