Exhaust Into Attic

It may also violate a shingle warranty.

Exhaust into attic.

You can find 4 in. You should never exhaust the bathroom fan directly into the attic. And many building codes require discharging exhaust to the building s exterior so it s just a good rule of thumb. Although this isn t always possible in attic crawl spaces you should always insulate the duct to prevent condensation problems.

No you cannot vent your bathroom exhaust fan into the attic. Attic ventilation works on the principle that heated air naturally rises primarily utilizing two types of vents. 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. Because what happens is when the insulation gets moist from all that moisture that s being dumped into the attic it completely cuts down on the r value of the insulation.

Venting into the attic sends excess moisture to that space which can cause mold and other problems. Intake vents located at the lowest part of the roof under the eaves allow cool. Your attic is not a temperature controlled environment is never the same temperature as your living space and generally closer to the temperature outside. We ve also seen homeowners have to replace all their roof decking because it became rotted from the excess moisture.