Manufactured homes, sometimes called mobile homes, are an affordable housing option for many South Carolina families, but they often log disproportionately higher energy bills than traditional wood frame or modular homes. Inexpensive building materials and construction defects are usually to blame. Here are common deficiencies to look for and tips for setting things right.
Belly board damage – In most manufactured homes, the belly board holds the insulation in place under the floor and serves as a vapor barrier. Plumbing that runs under the floor is on the warm side of the insulation to keep it from freezing in winter. However, the belly board can be damaged by animals, deteriorate over time or become torn, allowing the floor insulation to become moisture laden or to simply fall out, exposing ductwork and dramatically increasing energy losses. Belly boards are particularly vulnerable to water damage from leaky pipes, toilets and showers. Repairing or replacing a damaged belly board should be a top repair priority.
Air-infiltration points – Look for deteriorated weather stripping and insulation gaps in the “marriage wall” that joins multiple units making up the home. A careful inspection may also reveal gaps around doors, windows, and wall registers, behind washers and dryers, and around the electrical panel. Gaps can be filled with weather stripping and insulation. Consult your local hardware store for the exact type of insulation needed for the specific area of the home.
Damaged crossover ducts – Crossover ducts found in doublewide homes can be a source of air leaks. Flexible tubing ducts are prone to collapse and easily damaged by animals. Even metal ducts can leak if not properly joined and sealed. Plug the leaks with duct sealant or metal tape. Both are available at home improvement stores.
Lack of insulation – Insulation in manufactured homes can be woefully inadequate, usually far below the R-38 standard recommended for South Carolina. Upgrading insulation can be an easy, do-it-yourself fix, but only after all other repairs have been completed. For more tips on evaluating and upgrading insulation, see the article “Wrap it up.”