Insulation Around Bathroom Exhaust Fan

I m adding a bathroom exhaust fan which is being mounted in the ceiling of the bathroom in the attic and venting out through a vent in the wall.

Insulation around bathroom exhaust fan.

T he result of the insulation problem around a bathroom exhaust fan is either water stains or mold near the vent of your bathroom. If bath fan ducting isn t properly insulated the moist air from your house will condense inside the duct. Water stains on the ceiling around your bath fan may indicate a leak coming from the vent cap on your roof but condensation is the more likely culprit. Inspect the attic floor around the fan box for air leaks.

John you should be ok if the following. If you take it through the roof using a metal pipe do you use insulation around the pipe. Is this a fire hazard. What is the best thing to do to correct this problem.

The first step is to head to the attic. I have a bathroom exhaust fan that is vented directly into the attic. This article series explains how to install bathroom exhaust fans or vents the vent ducting the vent termination at the wall soffit or roof vent fan wiring bath vent duct insulation bath vent lengths clearances routing and we answer just about any other bathroom ventilation design or installation question you may have. Foam did not enter the fan enclosure.

Using spray foam to seal around a bathroom vent fan mar 12 2014 john said. Keep calm if that happens to you. In existing homes air seal and insulate around new or existing bathroom and kitchen exhaust fans to minimize air leakage to and from unconditioned attics. Right now there is a vapour barrier paper between the insulation in the attic and the drywall.

I sprayed insulation foam not the fire block around the bathroom vent fan in an attempt to seal small air leak from the attic.