Prior to re-insulating the underside of a manufactured home, general contractors conduct some precautions to get perfection in the work. Beneath the home, the ductworks shall be fully sealed, and so do the utility pipes as well as the floor joists.
Work may start with checking ducts for leakage in old dwellings. If the utility connections underneath the manufactured home leaks, a general contractor can open up the belly wrap and put an R-14 batten strip sealant over 2 inches foam board. As a precaution, contractors tend to use the fiberglass batten strips under the floor joists but not on water lines mainly because they do not hold water. Nonetheless, the lightweight fiberglass batten strip sealants are used beneath singlewide mobile homes, as they are current sealants in manufactured housing.
Apparently, there are two methods to insulate the underside of a manufactured home – the first one being “belly blow” and the second one, “side blow”. In the belly blow method, general contractors lay back, get cramped for space sometimes, and drive holes through belly fabric to fill the joist cavity. A general contractor may cut one hole on each joist bay and blow apart torn insulation if the joists are running crosswise. However, if the joists run lengthwise, the general contractor may cut holes eight feet each of the joist bay to fill the floor with batten strips.
Blowing from the underside is a tough ask for a general contractor and hence side blow method is chosen to insulate floor joists. In the side blow method, general contractors employee lifts the siding at the edge of the framed floor, drills the joist rim, to blow torn batten strips from the sides with a hose.
The access is one of the main concerns for a general contractor hence crawlspace underneath helps implement perfect methods to insulate the underside. If the joists were running lengthwise or even crosswise, a crawlspace of, say, thirty feet or more would help. Note that the personal belongings and such shall be removed from the floor before presuming the work as a precaution, and to access floor joist cavity from beneath with a flashlight. Remember, it is the underside of your home, and there may be imperfect light and other imperfections such as leakage on unsealed or improperly sealed homes.