How high should exterior plywood or other exterior siding be installed above finish grade?

The correct standard for installing exterior plywood or other exterior siding materials is to have them be at least 6 inches above finish grade. This elevation helps protect the siding from moisture, soil, and pests that can accumulate at ground level. Keeping siding elevated minimizes the risk of water damage, which can lead to mold growth, rot, and weakening of the structural integrity of the building.

This guideline is significant because in many building codes, maintaining this distance ensures that the siding remains durable and functional over time. When siding is too close to the ground, it is more susceptible to water infiltration and deterioration from organic material in the soil.

The guidelines surrounding this elevation may vary slightly by jurisdiction, but a distance of 6 inches is widely accepted. Other options suggest different heights, either less than or more than this standard, which wouldn't provide the same level of protection against the elements.