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Question DetailsAsked on 5/27/2017

is vapor barrier required when a mobile home has new vinyl sidding installed in cocoa fl ?

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Depends on the design of the mobile home - generally they should replace with what is there now. Some mobile homes, especially for hot humid, basically year-around A/C operating areas, do use an external vapor barrier under the sheathing, rather than under the interior finish as is normal for most of the country. It depends on where the primary moisture source is - interior moisture from body evaporation and cooking and showering, or from constantly humid outside air.

If you have an interior vapor barrier (might be able to see if you remove a couple of electrical cover plates or a piece of door or window trim - usually the free edge is seen sticking out or folder around the opening) then you definitely do NOT want an exterior one - you do not ever want vapor barrier on both sides of the wall to trap moisture in between.

Now - if there is NOT a vapor barrier there now, then a breathable water resistant barrier housewrap (which is not "waterproof"liek visqueen vapor barrier) designed to stop liquid water from penetrating, but breathable to let some air and moisture pass through, is what you want under the siding - that will act as a shedding layer to run off any water that gets in through siding leaks, flashing leaks, or if any siding goes missing/torn off in a storm. It is a breathable (you can blow through it somewhat) closely threaded synthetic fabric - the typically white housewrap you see on most new construction like Tyvek Homewrap. It is important to get the variety designed to go under siding, not the waterproof variety.

Answered 3 years ago by LCD

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