142 BULLETIN 414, V. S. DEPARTMENT OF AGRICULTURE. 



to this turpentme and drier also should be added. White lead is 

 used everywhere, but tends to yellow somewhat in the dark. White 

 zinc is used chiefly on interior work, being the whitest paint known. 

 Colored paints are commonly made by adding colored pigments to 

 lead or zinc. White, light blue, and light green are less durable 

 than yellow, gray, or dark colors. 



Painting always should be done in dry weather, and paint should 

 not be applied to lumber that is not dry. A week or more should 

 be allowed to elapse between successive coats. A gallon of paint 

 wUl cover from 400 to 600 square feet "of surface, depending upon 

 the character of the surface. 



WHITEWASH. 



Ordinary whitewash is made by slaking quicklime in water in a 

 pail or barrel covered with cloth or burlap. The proportions of lime 

 and water should be about 10 pounds of the former to 2 gallons of 

 the latter, and the lime should be allowed to slake for one hour. 

 When the slaking is complete, enough water should be added to 

 bring the whitewash to a consistency which may be applied readily. 



Weatherproof whitewash for exterior surfaces may be made as 

 follows : 



(1) Slake 1 bushel of quicklime in 12 gallons of hot water; (2) 

 dissolve 2 pounds of common salt and 1 pound of sulphate of zinc 

 in 2 gallons of boiling water; (3) pour (2) into (1), add 2 gallons of 

 skim milk, and mix thoroughly. 



Roofing Materials. 



PREPARED roofing. 



There are on the market a large number of so-caUed "prepared" 

 or "ready" roofings for covering the sheathing of wooden roofs. 

 They are made by cementing together two, three, or more layers of 

 tar-saturated felt or felt and burlap, then coating the combination 

 either with a hard solution of the same cementing material or with 

 a mixture of hot pitch or asphalt and sand or fine gravel. These 

 roofings are commonly put up in rolls 36 inches wide and are applied 

 by lapping the strips 2 inches, with a coat of cementing material 

 between, and nailing every 2 or 3 inches with tin-capped roofing 

 naUs. A sufficient quantity of cement, nails, and tin caps is packed 

 in the middle of the rolls. These roofings are especially suitable 

 for use in convict camps, for the reason that no previous experience 

 is required for laying them. 



In the construction of the portable buildings previously described 

 the prepared roofing can be fastened to the roof sections very satis- 

 factorily with No. 9 flaked glue. 



