Attic Insulation Over Bathroom Fan

Caulk or spray foam can be used to seal the box to the ceiling drywall and to seal around the exhaust pipe.

Attic insulation over bathroom fan.

Always cover the tops of the ceiling joists to make sure the insulation is deep enough to reach your target r value and to prevent thermal bridging the heat loss that occurs through the wood framing. When venting a bathroom exhaust fan make sure to vent the air to the outside rather than into your attic where it can cause mold and mildew to form. The exhaust fan housing should be covered with an insulated airtight box. If bath fan ducting isn t properly insulated the moist air from your house will condense inside the duct.

Another approach could be an insulated hvac duct approach. In un conditioned space such as an attic where otherwise your fan duct will be exposed to cold attic air in winter use insulated solid metal ducting or insulated flex duct. But some consider it somewhat flimsy and may not support the weight of insulation over any distance. When i got to my exhaust fan for my bathroom i added that last year i went right over the fan and covered it.

The box can be made from rigid foam. The seams can be taped with housewrap tape. If you see that your duct isn t insulated at all pick up duct insulation at the home center. There are several options available for the ducting like flexible aluminum ducting.

I want to make sure that is ok. You may find that the insulation simply needs to be refastened. Work from the perimeter of the attic toward the door or hatch so that you don t trample all over the insulation you just put in. Options for venting a bathroom exhaust fan include best to worst.

I had insulation from 1952 that was less than an inch thick. The first step is to head to the attic. How well the insulation around the bath fan will work depends on the ducting greatly.