Checks - seasoning checks not limited. Through checks at ends are limited as splits.

Knots - not limited as to quality but are well spaced and are permitted in the following sizes or their equivalent displacement:

Pockets - pitch or bark, not limited.

Shake - if through at ends, limited as splits. Elsewhere through shakes 1/3 the length.

Skips - hit or miss on any face, with a maximum of 10% of the pieces containing heavy skips on wide faces only.

Slope of Grain - 1 in 4.

Splits - equal in length to twice the width of the piece.

Stain - stained sapwood. Firm heart stain or firm red heart.

Unsound Wood - spots or streaks limited to 1/3 the cross section at any point along the length. Must not destroy nailing edge.

Wane - 1/3 the thickness and 1/2 the width full length, or equivalent on each face, provided that wane not exceed 1/2 the thickness and 3/4 the width for up to 1/4 the length.

Warp - 1/2 medium.

White Speck & Honey Comb - firm.

Manufacture - Standard “F” Manuacture admits: very heavy torn grain; raised grain; very heavy loosened grain; heavy machine bite; machine gouge; heavy machine offset; chip marks; knife marks; medium wavy dressing; medium mismatch.

Pitch & Pitch Streaks - not limited.