428 SELLING LUMBER 



Standard lengths are multiples of two feet, 4 to 24 feet, 

 inclusive, but lengths shorter than 10 feet' shall not be includ- 

 ed in miscellaneous or mixed lengths shipments except by agree- 

 ment. 



78. GROOVED ROOFING shall be graded by rules gov- 

 erning No. 1 Common Boards, omitting the pith knots, worm 

 holes, splits and seasoning checks that show an opening through. 



No. 2 COMMON BOARDS, D. & M., OR SHIPLAP, 

 GROOVED ROOFING AND BARN SIDING. 



Sizes. One-inch S. 1 S. or 2 S. to 13/16; 1%-inch S. 1 S. 

 or 2 S. to 1 1/16; 1^-inch S. 1 S. or 2 S. to 1 5/16 inches. 

 These thicknesses also apply when S. 4 S., Shiplap, D. & M. 

 and Barn Siding worked to 3/^-inch thick. 



Widths. On stock width shipments of No. 2 Common, 

 either rough or dressed one or two sides, no piece should be 

 counted as standard width that is more than ^2-inch scant on 

 8-inch and under; ^-inch on 9 or 10-inch, and ^4-inch on 11 

 and 12-inch or wider. Pieces narrower than this should be 

 measured as the next lower standard of width and not reduced 

 in grade. 



No. 2 COMMON BOARDS. 



79. No. 2 COMMON BOARDS, dressed one or two sides ; 

 No. 2 Shiplap, Grooved Roofing, D. & M. and Barn Siding 

 will admit knots not necessarily sound; but the mean or aver- 

 age diameter of any one knot shall not be more than one-third 

 of the cross section if located on the edge, and shall not be 

 more than one-half of the cross-section if located away from 

 the edge; if sound may extend one-half the cross-section if lo- 

 cated on the edge, except that no knot, the mean or average 

 diameter of which exceeds 4 inches should be admitted; worm 

 holes, splits one-fourth the length of the piece, wane 2 inches 

 wide or through heart shakes, one-half the length of the piece; 

 through rotten streaks ^-inch wide one-fourth the length of 

 the piece, or its equivalent of unsound red heart; or defects 

 equivalent to the above. 



A knot hole 3 inches in diameter will be admitted, pro- 

 vided the piece is otherwise as good as No. 1 Common. 



80. Miscut 1-inch Common Boards which do not fall be- 

 low 24-inch in thickness shall be admitted in No. 2 Comhion, 



