Venting Crawl Space Through Attic

Space attic vents evenly and mark the locations by driving nails up through the shingles photo 1.

Venting crawl space through attic.

The international residential code allows you to run a dryer vent through the attic but you can t terminate it there. Why does venting a clothes dryer into a garage attic or crawl space cause problems. Wear a dust mask while working in the attic and lay planks or plywood across rafters so you don t step though the drywall ceiling below. In all cases the ducting needs to conduct the exchaust to the building exterior and needs to terminate in an animal proof vent cover.

Can a dryer vent go up through an attic. Doing so would fill your attic with. This creates a vacuum in the lower levels of the home and can actually pull crawl space air all the way up through the roof of your home. However the opposite is true if the attic floor is air sealed and insulated.

This article describes routing bath exhaust fan duct upwards through an attic or roof space or downwards through a floor or crawl space. As such it would seem venting the attic would increase the potential for condensation. For example if your foundation size is 30 feet by 30 feet 900 square feet you will need vents that have combined square footage of 6 square feet. In the attic passive ventilation can reduce summertime heat buildup in the same way through convection as ridge and gable vents expel the hottest air at the roof peak and cooler air is drawn in at the soffits lowering the overall temperature of the attic.

Section r408 1 specifies that the crawl space under floor space which is the area between the bottom of the floor joists and the earth under the building not including the basement must have ventilation openings through the foundation walls or exterior walls. Bathroom ventilation fan duct routing routing a bath vent duct down out or up through an attic or roof out. Crawl space moisture solutions. Even when outside air is hot and humid if the attic space is air sealed from the interior it is much hotter than outside air.

Crawl space ventilation calculation. The dirt ground that makes up the floor of your crawl space is full of moisture. Of course sealing your crawl space vents isn t going to solve all your issues.