Bathroom Vent Pipe In Attic

Otherwise the exhaust duct gets too cold when it runs through the attic.

Bathroom vent pipe in attic.

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. Each fan vents separately out the roof. Each bathroom has its own exhaust fan. The best exhaust fan venting is through smooth rigid ducts with taped joints and screwed to a special vent hood.

One in line centrifugal fan can be mounted in the attic to exhaust the moisture from two bathrooms. No you cannot vent your bathroom exhaust fan into the attic. Example model ventilation codes. You can find 4 in.

Duct already wrapped in insulation at home centers. 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. If this pipe is not insulated the heat carried in the air transferred to the pipe will cause condensation and potentially cause water damage at your ceiling or in your attic. A cold duct allows condensation of moist indoor air leading to drips from the exhaust fan.

See bathroom vent duct termination for details about how to terminate the bath exhaust vent duct. 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. Although this isn t always possible in attic crawl spaces you should always insulate the duct to prevent condensation problems. Dumping bathroom exhaust into an attic or under roof space invites costly mold contamination frost under the roof in freezing climates moisture damage to roof sheathing possibly even plywood delamination or rot roof failures and shorter roof shingle life.

You should never exhaust the bathroom fan directly into the attic. Does bathroom vent piping need to be insulated. Is there any particular type of piping to be used through the attic metal ductwork pvc etc. The reason exhaust pipes are insulated in unconditioned spaces your attic is because they carry warm and moist air from your home to outside.

Both bathrooms are vented by a single in line fan that has one exhaust vent running through the roof. Exhausting of the bath vent fan must indeed be to the building exterior. It may also violate a shingle warranty.