Take the entire exterior measurement of the structure, including the projections of the cornice, in order to obtain the area of the hip roof. This is multiplied by the length of the main rafter, and the roof area is one-half of the result. In making an estimate for a hip roof, it must not be overlooked that in planning and setting the rafters, at least 30 percent extra must be applied for additional labour on an ordinary saddle roof.
The average cost of labour is about six times that of the price per square for covering the roof with rough boards-work only. If tin or slate is matched to the roof boards, allow a little more per square for labour.You can get additional information at tin roofing.
If there is a deck on the house, add 2 percent to the gross estimate, which is around the cost of additional cutting and fitting around deck eaves. In a hip roof, there will also be a loss of material that will amount to at least 5 percent of the total amount of stuff used, and an additional loss of 1 percent if the roof ends on a deck.
A shingle ‘s normal width is 4 inches, and a quarter of a bunch of shingles is expected to contain 250, each 4 inches broad, covering a line 1000 inches long when laid, or 83 foot 4 inches long when laid. Each shingle would cover an area of 16 inches when shingles are laid 4 inches to the weather, so that 900 so laid will cover an area 10 feet square. At this juncture, proper tape measurements and distance measuring wheels will be needed along with precision measurement equipment.
However, Shingles seldom keep out what they are meant to cover, so with each square of roofing, it is easier to estimate 1000 shingles than to confine ourselves to the actual measurement. In hip roofs, due to the great waste in cutting around the hips, 5 percent should be added; the same rule should be obtained for a roof having four or more valleys in it.
Tin Roof Costs
Timbers, boarding, paper, if any are used, and ribs must be taken into consideration when calculating the cost of a tin roof. A tin roof is typically a “flat roof” and, as a consequence, the timbers used to support it are heavier than the timbers in a typical saddle or hip roof. The boarding, which is normally paired, will cost as much as the boarding of a saddle roof will cost to lay, so those figures can be used as a reference. Don’t forget to include prices in the budget for measuring wheels, measurements for private label tape, and simple measuring tape.
Then add paper or felt, or something that can be placed under the tin, and for laying, charge a fixed sum per roll. In addition to the cost of lying the same, the cost of ribs would cost up to marginally less a square. 14 x 20 inches is a sheet of roofing tin, and 112 sheets are included in a tin package. A box of tin can cover approximately 182 square feet, allowing a decent percentage to cover the ribs, and for the top and bottom laps. The estimator must decide for himself the real prices in the region in which he lives.
And modify the figure to suit.