HELP! There is a Water Stain on My Ceiling
Why Is There A Water Stain On My Ceiling Next To An A/C Vent?
Now that summer is in full swing, the temperature inside your attic can be well over 100 degrees. The temperature inside your air conditioned house is probably between 72 and 80 degrees.
Construction Details Count
If there is an air gap between the register “can” and the ceiling drywall, condensation (water) will form on the warm side because of the extreme temperature differential and drip onto the drywall leaving a stain when the drywall dries out. Do not fear. There is a solution for this problem.
How To Solve The Problem
First, remove the grill from the ceiling. Then, carefully spray expandable foam between the register “can” and the drywall that surrounds it. I say carefully because the foam can drip, or if too much is applied, it can get over everything and it’s difficult to clean up.
Once the foam is completely dry, tear off any excess foam and spray the water-stained ceiling drywall with oil-based Kilz (white pigmented shellac). Once the Kilz dries, touch up the ceiling with matching paint and reinstall the grill.
Problem solved!
Questions?
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The upside of fiberglass insulation is its low cost, availability in small quantities, and ease of installation by almost anyone. The downside is that it allows a lot of air movement because it does not seal tightly to itself or structural members, it gets installed above the ceiling still allowing the attic above it to get very hot in the summer, and it is not as efficient of an insulator on an inch by inch basis.
The upside of spray foam insulation is many: more efficient than fiberglass bath (inch per inch), near 100% air sealing, soffit and ridge vents are not needed, applied to the underside of the roof deck so attic is kept cool and a smaller size HVAC system can be used, and it won’t get stepped on and have its R-value reduced due to its application location. It’s downsides include it must be applied by an approved application company and set-up/minimum charges start at about $1,500.






