140 BULLETIN 114, U. S. DEPARTMENT OF AGRICULTURE. 
The estimated itemized cost of this equipment of structures is as 
follows : 
Lumber, 14,000 board feet, at $18 per M $252 
Roofing, 20-gauge galvanized iron, 2^-ineh corrugations, 6,000 square feet, at 
11^ cents 690 
Ridge roll, bolts, nails, etc 20 
Canvas curtains, 10-ounce duck, 500 yards, 29 inches wide, at 27 cents per 
yard 135 
Screens, 3,360 square feet, at 8 cents 270 
Labor 300 
16 by 20 foot wall tent, 12-ounce army duck 45 
Total l 712 
Reducing this estimate to a cost per cubic foot, the costs of the 
principal items are as follows: 
Lumber SO. 007 
Roofing 019 
Ridge roll, bolts, nails, etc 001 
Canvas curtains 003 
Screens 003 
Labor 008 
Tent 001 
Total cost per cubic foot 042 
While the above cost is only a little more than two-thirds as great 
as that of the portable buildings designed by the Office of Public 
Roads and Rural Engineering, it should be borne in mind that those 
buildings are of a much higher type of construction and are suitable 
for winter as well as summer use. Furthermore, the canvas used in 
these buildings will have to be replaced every two years under 
normal conditions, and the metal roofing also will depreciate much 
more rapidly than any part of the portable buildings. For these 
reasons, notwithstanding then lower initial cost and narrower field 
of usefulness, it is believed that buildings of this general type will 
cost, in the long run, practically as much as the portable buildings 
previously described. 
SHACKS. 
Shacks of rough lumber made weather tight with a covering of tar- 
paper, similar to those used generally in free contracting camps, may 
be economically used for temporary camp purposes in sections where 
lumber is very cheap. Experience has shown that it does not pay 
to attempt to move them with the camp, the cost of taking them 
apart and the large proportion of lumber ruined being usually greater 
than the cost of new lumber. 
Structures of this kind can be built for from 2\ to 3 cents per cubic 
foot. 
