Replies

1. Expert Member
   BILL WICHERS | Jun 13, 2023 04:44pm | #1

   Sounds to me like you have the classic problem of recessed lights in an unvented ceiling assembly. This means mositure is getting into the ceiling assembly. The "make it leak by running more air conditioning" is probably the A/C getting the interior side of the assembly cold enough to condense out some of the moisture trapped in the ceiling, which then runs out as liquid water and leaks out around recessed lights and possible low points on the ceiling too.

   The easiest way to deal with this if you can work from above is to remove the old sheathing (which is probably moldy), and the insulation (which is probably moldy too), then rebuild things as either a vented assembly (add a vent channel under the sheathing and and also the associated soffit and ridge vents), or put enough exterior rigid foam on the exterior of that roof sheathing to get to the right ratio for your climate zone so that you don't need to vent the roof.

   BTW, why did you post a a PDF attachment of a letter and not just write your question directly into the Q+A post?

   Bill

2. Expert Member
   Michael Maines | Jun 13, 2023 05:04pm | #2

   I agree with Bill, and will add that if I understand your proposed solution, you want to sandwich fiberglass between spray foam and the roof sheathing? That's not safe or code-compliant. (You may not have to follow building codes but they're a good baseline for safe assemblies.)

3. 
   cinderala | Jun 23, 2023 12:12am | #3

   I think this project is okay!