SELLING LUMBER 431 



DIMENSION AND HEAVY JOIST. 



Sizes. Dimension shall be worked to the following: 2x4 

 S. 1 S. and 1 E. to 1^x3^ inches; 2x6 S. 1 S. and 1 E. to 

 1^x5^ inches; 2x8 S. 1 S. and 1 E. to 1^x7^ inches; 2x10 

 S. 1 S. and 1 E. to 1^x9^ inches; 2x12 S. 1 S. and 1 E. to 

 1^x11^ inches. Dimension S. 4 S. ^-inch less in thickness 

 and width than S. 1 S. 1 E. shall be standard, but no objection 

 shall be made to stock finished to the standard size for S. and E. 



HEAVY JOISTS shall be worked to the following: 2x14, 

 2y 2 and 3x10, 3x12 and 3x14, S. 1 S. and 1 E., green, ^-inch 

 off side and y 2 -mch off edge; S. 4 S. ^-inch off each face sur- 

 faced. Heavy Joists, rough, green, must not be over %-inch 

 scant in width or thickness. 



Dry 2x14 shall be dressed to the standard thickness of 2x12. 



Lengths. Standard lengths are multiples of two feet, 4 

 to 24 feet, inclusive, but lengths shorter than 10 feet shall' not 

 be included in miscellaneous or mixed length shipments, ex- 

 cept by agreement. 



Grades: No. 1, No. 2 and No. 3 Common. 



88. Inspection of Dimension is a question of strength and 

 uniformity of size, and whatever reduces its strength in cross- 

 section must be considered a defect to that extent. In comput- 

 ing the area of cross-section occupied by defects the size of 

 the piece in the rough must be considered. 



89. No. 1 COMMON DIMENSION AND HEAVY 

 JOISTS will admit sound knots, none of which in 2x4s should" 

 be larger than two inches in diameter on one or both sides 

 of the piece, and on wider stock which do not occupy more than 

 one-third of the cross-section at any point throughout its length, 

 if located at the edge of the piece, or more than one-half of 

 the cross-ection if located away from the edge; pith knots, or 

 smaller defective knots which do not weaken the piece more 

 than the knot aforesaid; will admit of seasoning checks, firm 

 red heart, heart shakes that do not go through ; wane Y^ of 

 an inch deep on edge, one-fourth the width and one-third the 

 length of the piece; pitch, sap stain, pitch pockets, splits in 

 ends not exceeding in length the width of the piece, a limited 

 number of small worm holes well scattered, and such other 



