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The other day when I was in the attic I noticed small sunrays on my hand and when I looked up I saw small (maybe 1/8 inch) gaps between HVAC metal vent and the roof. I have attached two pics
How can I close this gap? Would something like Great Stuff Gap Filler Insulating Foam Sealant be a good idea?
It doesn't need to be sealed.
If you go look at the exterior you should see a collar around the flue just above the boot- that keeps the weather out.
Thank you K'ledgeBldr. Its always informative to see your responses. I just did a google and found that "B Vent Storm Collar" to be similar to what I have above this vent on the roof.
However, if sunrays can come in won't water be able to come? For now I have tied rag clothes around the vent to prevent water (if any) from dripping on the HVAC unit in the attic.
You might want to check the storm collar. This acts like an umbrella to keep rain water from the connection just above the roof. If there is light coming in, it might not be sealed correctly which can allow rain water to eventually start leaking in.
Yes, go on the roof to inspect the pipe, flashing(s), and termination. If you are not comfortable going up on your roof, have someone capable do it. You don't want water running down that pipe onto or into the equipment or elsewhere.
OP here. The HVAC guys (they had installed the new system around 6 months back) came and added some high temperature sealant (as some of you had mentioned). Thanks a lot to all of you. They did not go on the roof so the suspicion about loose or improperly installed collar still remains.
OP here. The HVAC guys (they had installed the new system around 6 months back) came and added some high temperature sealant (as some of you had mentioned). Thanks a lot to all of you. They did not go on the roof so the suspicion about loose or improperly installed collar still remains.
The sealant did not cure the issue completely. During yesterday's rains, notice water coming in minute drops. So back to square one.
You have 3 integral parts- the flue pipe, the roof boot, and the rain collar.
The flue pipe is directly connected to the furnace; it expands and contracts accordingly with the use of heat. The boot on the other hand expands and contracts with exposure to the exterior air temperature and direct sunlight. So those two parts will move at different times and in different directions. That is why they are not "connected".
The rain collar fits securely to the flue pipe directly above the boot. If there is too much gap between the collar and the boot it is possible to get a little rain/water running down the pipe- especially if its a driving rain. It's also possible that at certain times of the day the angle of the sun would shed a beam of light through the slight opening between the pipe and the boot. But this would be highly unlikely if the collar was in the right location.
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