Adding vents in my underpinning


Old 05-13-06, 02:15 PM
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Adding vents in my underpinning

i live in west virginia and now own my first mh. i have used vinyl underpinning rock type. 5' * 36" i have 2 1/2 feet of space under my 14' * 70' home. i have good wind from the front to back of home. i setup in december and have put off cutting them in until now. i'm wondering any tips on planning where to cut holes. and how many i need. also why is it not a good idea to shut them off
in the winter (seems like such a heat loss). thanks for any help
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Old 05-13-06, 02:54 PM
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There is a formula on how many sq inches of ventilation you are supposed to have for a given area unfortunatetly I don't know what it is. IMO about 4-5 on each side and 1 on each end would be about right.

They say not to close up the vents in winter because you still need the air circulation to keep the moisture level down but I've always closed the vents in winter and reopened them when it gets warm. If for some reason you had a lot of moisture it would be better to leave them open - maybe even add extra vents.

Hope you enjoy your MH
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