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Plywood is the best type of subfloor for a mobile home, though if you’re installing flooring in a bathroom, you may want to install a vapor barrier or use a moisture-proof subfloor material like Amdry. OBS is similar, but it can swell when moisture is present. 

Either way, old mobile home subflooring made from particleboard can cause issues with your joints. If you’re replacing your subfloor, it’s best to upgrade to plywood.

A transition piece between carpet stairs and wood flooring isn't always necessary. A transition piece separates two types of flooring in between rooms and areas, like carpet and vinyl. Because the carpet on the stairs tucks into the seam, you can’t see the fringes, and there is no need to hide anything. However, you can use a stair cap if your stairs have a nose.

A stair runner is a length of carpet installed in the center of the staircase, either on top of or in between hard materials installed on the staircase. The carpet doesn’t cover the entire length of the steps, making stair runners an aesthetic choice. Thankfully, if you want hard materials on your stairs to show through, a stair runner will make it safer, as the primary area you walk on will be less slippery thanks to the carpet. 

A subfloor's lifespan can range from 30 years to the entire life of the house, which is often between 50 and 100 years. The actual longevity depends on the material and its protection from damage. For example, while OSB may last longer than plywood, it is not the best choice for heavy flooring like ceramic tile. The most critical factor is moisture; a subfloor that avoids water damage, mold, and termites can last for decades. However, prolonged exposure to moisture will cause it to warp, rot, or grow mold, significantly shortening its life.