What does backer board enhance when used with siding?

The use of backer board with siding enhances both insulation and strength. Backer board serves as an additional layer of material that can improve the structural integrity of the siding installation, providing support and resistance against the elements. This added strength helps the siding withstand weather-related stresses, which can prolong its lifespan.

In terms of insulation, backer boards, especially those made from foam or cementitious materials, can enhance the thermal resistance of the exterior wall system. This improved insulation can lead to better energy efficiency, helping to maintain a comfortable indoor environment while potentially lowering heating and cooling costs.

The other options do not accurately represent the primary functions of backer board. While it may contribute slightly to sound acoustics or cosmetic appearance, those are not its main benefits in the context of siding installation. The primary focus is on increasing insulation and structural strength.