Many interior concerns result from the lack of proper spacing, construction, and placement of pier supports. In some, consideration of soil bearing capacity and/or soil types may have been overlooked. Clayey type soils swell and shrink with wetting and drying, this creates a differential settling concern that may result in distorting the home.
What may appear to be a manufacturing concern of improper application of exterior siding may actually be of foundation causation due to differential settling creating distortion on the home, resulting in fastener failure and/or gaps created in the structure allowing moisture movement inward the home.
Many moisture complaints are linked to foundation concerns.
The purpose of proper installation is to transport the loads "evenly" to the soil.