To 3 inch flooring add one-third for the matching. To 4 inch flooring add one-fourth for the matching. To 6 inch flooring add one-fifth for the matching. To 4 inch ceiling add one-third for the matching. To 6 inch ceiling add one-fifth for the matching. To 8 inch shiplap add one-sixth for the matching. To 10 inch shiplap add one-eighth for the matching. To 12 inch shiplap add one-tenth for the matching.

Estimating Siding

To 6-inch beveled siding add one sixth and make no deductions for openings, for in general the openings will fully equal the lap and waste in cutting.