How To Look At A House
McGarry and Madsen's home inspection blog for buyers of
site-built, mobile/manfuactured and modular homes
How many foundation vents are required in the skirting of a mobile/manufactured home?
Tuesday, July 23, 2019
The standard ventilation requirement is based on the total area of the vents instead of the number of them. One square inch of ventilation opening for every square foot of floor space of the home is standard. More is even better. Skirting with built-in ventilation holes (shown above) is available or you can install solid decorative skirting, such as simulated brick or rock, and cut-in the required vents at regular intervals.
Ventilation openings should be evenly distributed on all four sides of the home to get the necessary cross-ventilation air flow. Be sure to place a vent within 3-feet of each corner to prevent any “dead air” pockets in the corners, and don’t block the vents with stored items in front of them later.
It’s also important to promptly repair any damage to the vents or skirting, because any openings will let squirrels, rats, and stray cats—or raccoons, possums, or skunks in rural areas—under the home and possibly cause damage to the belly board. Keeping it buttoned-up also means you are less likely to have a confrontation with a frightened, cornered animal when you enter the crawl space to check it.
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