HEAVY TIMBER 



Table B. Average Weights of Timber and Roofing Materials. 



TIMBER , 



(Not over 15% moisture) 



Weight 



Kind of Wood in Lbs. per 



Cu. Ft. 



Cypress 29 



Douglas Fir 32 



Hemlock 26 



Oak, Bed 46 



Oak, White 50 



Pine, Cuban 40 



Pine, Loblolly 40 



Pine, Longleaf Yellow 38 



Pine, Norway 31 



Pine, Shortleaf Yellow 32 



Pine, White 24 



Spruce 25 



Tamarack 35 



Weight 



Flooring in Lbs. per 



1000 Ft. B. M. 



Maple, Beech or Birch, 13/16 in.xl% in. or 2% in 2100 



Spruce 13/16 in. thick 2000 



White Pine and Hemlock " " " 1800 



Yellow Pine " " " 2250 



1 Douglas Fir ' ' " " 2000 



ROOFING MATERIAL 



Weight 



Lbs. per Sq. Ft. 

 of Eoof 



Copper 1 



Iron, Corrugated 1 to 4 



Iron, Galvanized 1 " 3 



Lead, Sheet 4 ' ' 8 



Shingles, Wood 2% 



Slate 10 



Tile, Fancy, laid in mortar 25 to 30 



Tile, Plain 12 



Tin, Painted 1 



Zinc 1 to 2 



Beady Roofing, 3-ply 1 



Felt and Gravel Roofing, 4-ply 5% 



Felt and Gravel Roofing, 5-ply 6 



The following table, taken mainly from Report No. V., 

 Boston Manufacturers Mutual Fire Insurance Co., gives the 

 approximate weights of merchandise. In designing storehouse 

 floors it is important to provide for the greatest load which is 

 likely to be placed in the building. 



Page fifty-four 



