Bathroom Fan Insulation Attic

Bathroom vent fan ductwork insulation.

Bathroom fan insulation attic.

Insulate the bathroom exhaust vent fan ducts. Before you rush to the attic or go the roof to check for any leaks make sure the exhaust fan duct is properly insulated and run the fan more frequently for a prolonged period. Through the roof or an exterior gable wall. 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.

You may find that the insulation simply needs to be refastened. This is much easier to do if you have attic access because if you don t you usually have to remove some ceiling drywall and run the ducts along a joist. To avoid mistakes not running it at all consider installing switches with built in timers. Insulate your attic access door hatch with weatherstripping and foamboard to r10.

The building code requires a bathroom exhaust fan to vent outside the building so installation of a new bathroom fan necessarily involves installation of ductwork. Caulk foam seal all penetrations into the attic space ie duct chases plumbing chases wiring electrical boxes from lights down below. The first step is to head to the attic. If bath fan ducting isn t properly insulated the moist air from your house will condense inside the duct.

Seal off the chimney chase with sheet metal and or non combustible caulk. 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.