422 SELLING LUMBER 



55. No. 3 SHEATHING (OR No. 3 COMMON FLOOR- 

 ING) will admit all pieces that cannot be used as No. 2 Com- 

 mon Flooring, but are still available as cheap sheathing or lath- 

 ing without a waste of more than one-fourth the length of any 

 one piece. 



56. CENTER MATCHED FLOORING (or S. 2 S. and 



C. M.) shall be required to come up to grade on one side only, 

 and the defects admissible on the reverse 'side of standard 

 matched shall be allowed. 



57. No. 1 COMMON FACTORY FLOORING will ad- 

 mit of sound knots not over one half the cross-section of the 

 piece at any point throughout the length ; pitch pockets, sap stain, 

 shakes that do not go through, firm red heart, seasoning checks 

 which do not show an opening through the piece, wane one- 

 fourth inch deep on the face, a limited number of pin worm 

 holes well scattered, loosened or heavy torn grain or other 

 machine defects which will lay without waste, and pith knots 

 which will not cause a leakage of grain. (See Sees. 35 and 

 123). 



CEILING. 



Sizes. Ceiling shall be worked to the following: ^-inch 

 Ceiling, 5/16-inch; ^-inch Ceiling, 7/16-inch; ^-inch Ceiling, 

 9/16-inch; ^-inch Ceiling, 11/16-inch; same widths as Floor- 

 ing. The bead on all Ceiling and Partition shall be depressed 

 1/32 of an inch below surface line of piece. 



Lengths. Standard lengths are 4 to 20 feet. Five per 

 cent of 8 or 9 feet is allowed in mixed length shipments of B 

 and Better Ceiling, and in addition 5 per cent of 6 or 7 feet in 

 No. 1 Common, and in addition 5 per cent of 4 to 5 feet in 

 No. 2 Common. 



(The above percentage is allowed in all shipments of mixed 

 lengths, even though the number of feet of each length be specific- 

 ally stated.) 



Grades : A, B, No. 1 and No. 2 Common. 



58. Special. Defects named in Ceiling are based upon a 

 piece manufactured from 1x4 12 feet, and pieces larger or 

 smaller than this will take a greater or lesser number of de- 

 fects, proportioned to their size on this basis. 



