258 ROOF COVERINGS 



of roof, gravel to be screened through a ^-inch mesh and to be free 

 from loam. All walls to be flashed with old style tin or galvanized 

 iron, or a 2 x 4 is to be built into the wall to make connections to. 



Prepared asphalt roofing can be bought in the market. It is sold 

 in rolls 36 inches wide and is laid in courses. 



The Arrow Brand Ready Asphalt Roofing, manufactured by the 

 Asphalt Ready Roofing Company, New York, was quoted in 1903 de- 

 livered in central Illinois as follows: Arrow. Brand No. I, sand sur- 

 faced, per roll $2.75; rolls contain no square feet which will cover 

 100 square feet of roof and weigh 80 pounds. Arrow Brand No. 2, 

 gravel surfaced, per roll $2.75 ; rolls contain no square feet which will 

 cover 100 square feet of roof and weigh 140 pounds. The necessary 

 nails and asphalt required in laying the roofing are included in the 

 above prices. This roofing is in use by a number of railways. 



Shingle Roofs. Shingle roofs are now very seldom used for mill 

 buildings. Shingles have an average width of 4 inches and with 4 

 inches laid to the weather 900 are required to lay one square of roof. 

 One thousand shingles require about 5 Ibs. of nails. One man can lay 

 from 1500 to 2000 shingles in a day of 8 hours. The cost of shingle 

 roofs varies with the locality from, say, $3.25 to $6.25 per square. 



Asbestos Roofing. The "Standard" Asbestos Roofing, manufac- 

 tured by the H. W. Johns-Manville Co., New York, is composed of a 

 strong canvas foundation with asbestos felt on the under side, and sat- 

 turated asbestos felt on the upper side finished with a sheet of plain 

 asbestos ; the whole being cemented together with a special cement and 

 compressed together into a flexible roofing. It does not require paint- 

 ing, although it is commonly painted with a special paint, one gallon 

 of which will cover about 150 square feet. The roofing is laid with a 

 lap of 2 inches, beginning at the lower edge of the roof and running 

 parallel to the eaves. The laps are cemented and are nailed with special 

 roofing nails and caps. The roofing is laid on sheathing and is very 

 easily and cheaply laid. It is quite flexible and may be used for flash- 

 ing and for gutters. It is practically fireproof and makes a very satis- 

 factory roof. Asbestos roofing comes in rolls and weighs about 75 



