Pieces otherwise as good as "B" Floor- 

 ing may have one defect (like a knot 

 hole) that can be cut out by wasting 11/2 

 inches of the length of the piece, pro- 

 vided both pieces are 16 inches or over in 

 length after cutting out such defects. 



52. No. 1 COMMON FLOORING is 

 the combined grade of C and D Flooring, 

 and will admit all pieces that will not 

 grade "B," and are better than No. 2 

 Common. 



53. No. 2 COMMON FLOORING 

 admits all pieces that will not grade as 

 good as "D" flooring that can be used for 

 cheap floors without a waste of more than 

 one-fourth the length of any one piece. 

 (See Sec. 25.) 



54. No. 3 SHEATHING (OR No. 3 

 COMMON FLOORING) will admit all 

 pieces that cannot be used as No. 2 Com- 

 mon Flooring, but are still available as 

 cheap sheathing or lathing without a 

 waste of more than one-fourth the length 

 of any one piece. 



54- A. Standard Matched Flooring to be 

 surfaced two sides with scored back. 



55. CENTER MATCHED FLOOR- 

 ING (Or S. 2 S. and C. M.) shall be re- 

 quired to come up to grade on one side 

 only, and the defects admissible on the 

 reverse side of standard matched shall be 

 allowed. 



56. No. 1 COMMON FACTORY 

 FLOORING will admit 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 de- 

 fects which will lay without waste, and 

 pith knots which will not cause a leakage 

 of grain. (See Sees. 34 and 122.) 



CEILING 



Sizes. Ceiling shall be worked to the 

 following: %-inch Ceiling, 5/16-inch; Vfc- 

 inch Ceiling, 7/16-inch; %-inch Ceiling, 

 9/16-inch; 3^-inch Ceiling, 11/16-inch; 

 same widths as Flooring. The bead on all 

 Ceiling and Partition shall be depressed 

 1/32 of an inch below surface line of 



piece. (For drawings scaled to actual size 

 see page 45.) 



Lengths. Standard lengths are 4 to 20 

 feet. Five per cent of 8 or 9 feet is al- 

 lowed in mixed length shipments of B and 

 Better Ceiling, and in addition five per 

 cent of 6 or 7 feet in No. 1 Common, and 

 in addition five per cent of 4 and 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 specif- 

 ically stated.) 



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



57. Special. Defects named in Ceiling 

 are based upon a piece manufactured from 

 1 x 4 12 feet, and pieces larger or smaller 

 than this will take a greater or less num- 

 ber of defects, proportioned to their size 

 on this basis. 



57-A. The amount of crook permissible 

 in No. 1 Common and Better Ceiling may 

 be as follows : 



16 feet lengths as a basis for 3-inch 

 widths; 3 Vfc -inch crook. 



16 feet lengths as a basis for 4-inch 

 widths. 3-inch crook. 



16 feet lengths as a basis for 6-inch 

 widths, 2 1/2 -inch crook. 



Lengths longer or shorter than 16 feet 

 may have a proportionate amount of crook. 



58. "A" CEILING must be practically 

 free from defects on the face side and well 

 manufactured. 



59. "B" CEILING will admit of any 

 two of the following defects or their 

 equivalent of combined defects: slight 

 torn grain, three pin knots, one standard 

 knot, three small pitch pockets, one stand- 

 ard pitch pocket, one small pitch streak, 

 small seasoning checks, 15 per cent sap 

 stain, 15 per cent firm red heart, six pin 

 worm holes. 



60. No. 1 COMMON CEILING will 

 admit the following defects or their equiv- 

 alent of combined defects: sound knots 

 not over one-half the cross-section of 

 piece in the rough; sap stain, pitch, pitch 

 pockets, firm red heart, slight shake, 

 neavy torn grain, seasoning checks that 

 do not show an opening through; de- 

 fects in manufacture that will lay with- 

 out waste, a limited number of pin worm 

 holes well scattered. 



Page Fifty-three 



