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Sealing Access Holes for Crawlspace and Attic

Air Sealing with AeroBarrier 

Washington State is home to many rodents that will work night and day to gain access to your warm crawlspace and attic. They chew through plastic, wood, and even light gauge screening. Protecting your building from their access is not only recommended but even has a building code on how it needs to be done.

Yes, there is even a building code stating how access points into the Attic and Crawlspace need to be secured. Exterior openings into the attic space of any building intended for human occupancy shall be protected to prevent the entry of birds, squirrels, rodents, snakes, and other similar creatures.

Openings for ventilation having a least dimension of 1/16 inch (1.6 mm) minimum and 1/4 inch (6.4 mm) maximum shall be permitted. Openings for ventilation having a least dimension larger than 1/4 inch (6.4 mm) shall be provided with corrosion-resistant wire cloth screening, hardware cloth, perforated vinyl or similar material with openings having a least dimension of 1/16 inch (1.6 mm) minimum, and 1/4 inch (6.4 mm) maximum. Where combustion air is obtained from an attic area, it shall be in accordance with Chapter 7 of the International Mechanical Code 701.1 - 708.1.

Need help with air sealing call us 425.608.9553