How To Look At A House
McGarry and Madsen's home inspection blog for buyers of
site-built, mobile/manfuactured and modular homes
Can I use Tyvek as a belly wrap replacement for a mobile home?
Tuesday, September 11, 2018
That does not sound like a good idea. The belly wrap (also called belly board) that covers the entire bottom of a mobile home is typically polyethylene sheeting, which woven from black tapes of high density polyethylene and extrusion coated with a solid layer of low densityblack polyethylene coating. The coating makes it a VAPOR BARRIER. It is installed to keep the moisture in the soil under a manufactured home from rising up as water vapor into the floor framing and potentially causing wood rot and mold. Tyvek™, on the other hand, is a WATER AND AIR BARRIER, but is specifically designed to let WATER VAPOR PASS THROUGH.
When used as a housewrap on the exterior walls of a home, Tyvek™ (and any similar brand of flashspun high-density polyethylene fiber sheet) allows the moisture in the air that is generated by showering, cooking, breathing and other household activities to pass through the wall—rather than be trapped and build up inside the wall framing. But you do not want water vapor rising up through the floor, so we recommend sticking with regular polyethylene sheeting as belly board replacement. The best quality belly board is woven from black tapes of high-density polyethylene that is coated with a continuous layer of low-density polyethylene that seals it.
Tyvek™ is an amazing product, but this does not appear to be the right use for it. You might want to check with your mobile home manufacturer if you want a second opinion.
Also, see our blog post What is the plastic sheet called that covers the underside of a mobile home?
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Here’s links to a collection of our blog posts about MOBILE/MANUFACTURED HOMES:
• Where can I file a complaint if I have problems with my new or used manufactured/mobile home in Florida?
• What are the most common defects in mobile/manufactured home foundation piers?
• How do I determine the age of a very old mobile home?
• What is a "HUD label verification letter" for a mobile/manufactured home?
• When did a ground cover vapor barrier (plastic sheet) become required under a mobile/manufactured home?
• Is it safe to go under a mobile home?
• Are older mobile homes unsafe?
• What do I need to know about buying a foreclosed mobile home?
• Does it make sense to buy an older mobile home and remodel it?
• Where do I find the vehicle identification number (VIN) on a mobile home?
• How do I find out how old a mobile home is and who manufactured it?
• What is the right price for a used mobile home?
• How energy efficient is a mobile home?
• When were the first double-wide mobile homes manufactured?
• How do I upgrade my old (pre-1976) mobile home to meet HUD standards?
• What size air conditioner is right for my mobile home?
• Can you move an older mobile home in Florida?
• What does the HUD tag look like and where do I find it on a mobile home?
• Can you put a zone 1 mobile home in Florida?
• How can I remove water under my mobile home?
• What's the differences between a trailer, a mobile home, a manufactured home, and a modular home?
• What is a D-sticker mobile home?
• What are the tie-down requirements for a mobile home?
• How fireproof is a mobile home?
• Can I install a mobile home myself?
• What is a Park Model mobile home?
• Does an addition to a mobile home have to comply with the HUD Code?
• What walls can I remove in a mobile home?
• What can I do to prevent dampness and mold in my mobile home?
• How can I tell if a mobile home is well constructed?
• How can I tell the difference between a manufactured home and a modular home?
Visit our MOBILE/MANUFACTURED HOMES page for other related blog posts on this subject, or go to the INDEX for a complete listing of all our articles.
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