So I have a duct elbow that condensates, but it’s located behind my living room wall. I cut the wall out and had an insulation company spray foam insulation in the ceiling bays to stop any humid air from reaching this duct, but it is still dripping water from the elbow joint. Would doing something like this to that leaky elbow joint help that issue you think?
Yes. You have to insulate the duct specifically. Blocking the air and humidity infiltration is important but it doesn't take the place of insulating the duct itself.
Yes, to avoid condensation. Even if the heat would leak in conditioned space and have no effect on efficiency, in the AC mode the duct may sweat and drop condensation on the drywall.
Ideally the flexible ducts should be at least R8 insulation and in good condition. The internal plastic lining and the external plastic lining should be air tight and not damaged from UV light. Joints should be sealed with mastic and air tight. If you like additional help please reach out in comments and we are more than happy to assist you.
Any supply duct should be insulated. Keeps the sweat from drippin. Return ducts necessarily do not bc it doesn’t have any purplish but to cycle air back into unit. Don’t go wrapping all duct you see.
Not necessary if you already mastic-ed the ducts perfectly. I guess there may be some r value if you mastic the tape but an immeasurable amount and not worth the time and effort.
@@Kevinm0626 that's likely true. I think temperature and humidity around the duct have a lot to do with what's adequate. Then you have minimum building codes to meet.
