One gallon of Bora-Care will treat approximately 100 lineal feet of 2 x 4 stud wall. This includes sill plate and header. For other dimensional lumber, logs, or siding and plywood, please see the product label to the left. Typically, one gallon of concentrate Bora-Care will treat 800 square feet of a 2x4 stud wall, and 500 square feet of a crawl space or attic.