What are the HUD requirements for site drainage when installing a mobile/manufactured home?
Thursday, June 14, 2018
HUD requires new mobile home installations to comply with their Model Manufactured Home Installation Standards, at 24 CFR 3285.203(d), which states that “all drainage must be diverted away from the home and must slope one-half inch per foot away from the foundation for the first ten feet. Where property lines, walls, slopes, or other physical conditions prohibit this slope, the site must be provided with drains or swales or otherwise graded to drain water away from the structure, as shown in Figure to 3285.203.”
Half-Inch Per Foot Slope Away From Home
A shortened version of this HUD-code is “half-inch per foot slope for first ten foot away from home, unless other adequate drainage means is provided.” The HUD diagram is also shown below.
No Depressions Where Water Can Puddle
That statement in the middle of the HUD diagram about “home sites must be prepared so that there will be no depressions in which surface water may accumulate beneath the home” is important. Small riverbed-like depressions running under a home, like in the photo below, are an indication that proper site prep was not done and water is not being diverted around the foundation.
For how to prevent moisture problems inside your mobile home, see our blog posts What can I do to prevent dampness and mold in my mobile home? and How can I remove water under my mobile home?
Here’s links to a collection of our blog posts about MOBILE/MANUFACTURED HOMES:
How To Look At A House
McGarry and Madsen's home inspection blog for buyers of
site-built, mobile/manfuactued and modular homes
for Links to Collections
of Blog Posts