APPROXIMATE COST OF SLATING, PER SQUARE
==================================+========+=========+============
| | Cost of |
|Cost of | Laying, | Total Cost,
Classification | Slate |Including| Exclusive
|F. O. B.| Roofing |of Builder’s
|Quarries|Felt, and| Profit
| | Freight |
----------------------------------+--------+---------+------------
_Black Slate_ | | |
Brownville, Maine | $8.00 | $5.00 | $13.00
Monson, Maine | 7.00 | 5.00 | 12.00
Peach Bottom, Pennsylvania | 5.50 | 4.00 | 9.50
Chapman (Hard Vein), Pennsylvania | 4.50 | 3.50 | 8.00
Bangor, Pennsylvania | 4.50 | 3.50 | 8.00
Lehigh, Pennsylvania | 4.00 | 3.50 | 7.50
Buckingham, Virginia | 3.75 | 4.00 | 7.75
_Red Slate_ | | |
Vermont | 12.00 | 4.25 | 16.25
_Green Slate_ | | |
Vermont | 5.50 | 4.25 | 9.75
_Purple Slate_ | | |
Vermont | 5.00 | 4.25 | 9.25
_Mottled Slate_ | | |
Vermont (Purple and Green) | 4.00 | 4.25 | 8.25
==================================+========+=========+============
=59. Sheet-Metal Roofs.=—In estimating sheet-metal roofs, the hips and
valleys are measured extra their entire length by 1 foot in width, to
compensate for increased labor and waste of material in cutting and
laying. Gutters and conductor pipes, or leaders, are measured by the
linear foot, 1 foot extra being added for each angle. All flashings
and crestings are measured by the linear foot. No deductions are made
for openings (chimneys, skylights, ventilators, or dormer-windows) if
they are less than 50 square feet in area; if between 50 and 100 square
feet, one-half the area is deducted; if over 100 square feet, the
whole opening is deducted. An extra charge is made for labor and waste
of material to flash around openings.
=60.= There are two regular sizes of roofing plates, namely, 20 in. ×
28 in. and 14 in. × 20 in. The larger size is generally used on common
work, owing to the fact that it requires fewer seams on the roof and
consequently cheapens the cost of laying. A third size, namely, 10
in. × 20 in., is also supplied, and is used generally for gutters and
leader pipes. Sheets 10 in. X 14 in. are sometimes used for laying
roofs, as they can be cleated better than the larger sizes. Such small
sheets, however, cost more to lay.
Two thicknesses of roofing plates are commonly recognized. One is the
IC, or No. 29 gauge, and weighs 8 ounces to the square foot; the other
is the IX, or No. 27 gauge, and weighs 10 ounces to the square foot.
Sometimes, a still heavier plate is called for, and it is therefore
kept in stock by the best manufacturers. This plate is known as IXX, or
No. 26 gauge, and is used for especially heavy work.
Formerly, the standard net weight per box of IC, 14" × 20" roofing tin
was 112 pounds, or 1 pound per sheet, making 112 sheets to the box;
but now this weight is reduced to 108 pounds. The old standard for IX
plates was 140 pounds, but very few brands now weigh more than 135
pounds per box. The most reliable manufacturers guarantee the weights
for the different boxes of tin, and if the material does not come up
to the guaranteed weight, it can be returned. The best sheets in the
market today are stamped with the mark of the brand and the designation
IC or IX of the thickness.
=61.= Using standing joints, a 14" × 20" sheet of roofing tin will
cover about 235 square inches of surface, or one box of such tin will
cover about 182 square feet. With a flat, lock seam, a sheet will cover
255 square inches, allowing ⅜ inch all around for joints; or a box will
lay 198 square feet. These figures make no allowance for waste.
Two good workmen can put on from 250 to 300 square feet of tin roofing
per day of 8 hours; this also includes painting the outside of the
tin. Tin roofing will cost from 8 to 10 cents per square foot,
depending on the quality of material and workmanship.
=62. Tile Roofs.=—Since =tile roofs= are constructed of so many styles
of tile, no general rules of measurement can be given. Every piece of
work must be estimated according to the particular kind of tile used
and the number of sizes and patterns. Information on all these points
is to be found in the catalogs of tile manufacturers.