The lowest edge of untreated siding shall be a minimum of how high above grade?

The requirement for untreated siding to be a minimum of 6 inches above grade is rooted in building codes and practices designed to protect the material from moisture damage. By establishing a height of 6 inches, this standard helps ensure that water runoff, as well as soil and organic matter, do not come into contact with the base of the siding.

Keeping untreated siding elevated reduces the likelihood of rot, mold, and pest infestations that can occur when moisture is trapped against the wood. Such issues can lead to significant deterioration of the siding over time, necessitating repairs or replacements. The 6-inch guideline is therefore a preventative measure to enhance the durability and longevity of the siding while complying with best practices in construction and design.