Bathroom Fan Attic Insulation

Through the roof or an exterior gable wall.

Bathroom fan attic insulation. While insulating you can make some mistakes. Mount fan inside boot. Or you rent a blower. 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.

In some localities the building department may require the use of r 3 to r 8 fiberglass pipe insulation to control condensation and even when it isn t required it s a good idea to use it especially if the vent opening is likely to ice up during the winter. Options for venting a bathroom exhaust fan include best to worst. Seal boot to existing vapour barrier. Cut hole like an x where elec and vent pass through.

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. Insulate the bathroom exhaust vent fan ducts. Make sure vent pipe is insul wrapped. If bath fan ducting isn t properly insulated the moist air from your house will condense inside the duct.

Install a vapour barrier boot where your fan will go. Condensation can be a problem in an uninsulated attic so the homeowners trades resource center recommends installing rigid pipe with a minimum slope of 1 8 inch per foot toward the vent outlet to keep water away from the fan. You may find that the insulation simply needs to be refastened. I think you need to go into attic regardless as the fan housing probavly has brackets attached to the attic joists.

If you see that your duct isn t insulated at all pick up duct insulation at the home center. Seal holes around elec and vent with tuc tape and with accoustic sealant. Mar 8th 2018 2 12 pm. You can buy a bags of cellulose from lowes fluff it up into a garbage bags and dump into attic after you are done on top of the area where you disturbed insulation.