Waste Factor On A Hip Roof

It could be the difference between winning and losing the bid.

Waste factor on a hip roof.

Divide the rise by the run the run is 12. A 10 slope roof should not be confused with a 10 pitch roof as a 10 slope roof means that the roof rises by ten inches for every foot of run. Enter a waste factor. Simply locate a roof rafter board place the end of the level against the bottom edge and measure from the 12 inch mark vertically to the bottom edge of the rafter.

The 3977 70 is the total of your actual roof measurements. This will give you the rise over run or pitch. Unless it s cut to ribbons more than likely you ll have a lot of left over bundles at 15 waste factor. This roof slope factor table also consists of hip and valley factors to measure the possible hips and valleys.

That s 500 to 600 variance on the estimate. Calculating waste factor for hip roof w valley using cedar shakes 1 i ve been told that my hip roof would result in a whopping 30 waste factor with cedar shakes that three additional squares of shakes are needed above the amount required to cover the raw square footage. Same size roof now a hip roof at 7 5sq waste. Percentage the results roof area total square footage of the roof.

For example if you measure 4 inches the pitch of your roof is 4 12. Ridge length top ridge plus the 4 hips in lineal feet. The waste is 4295 92 95 divisor 4522 02. A roof pitch multiplier also called a roof pitch factor is a number that is multiplied by the area covered by a sloped roof to produce the area of the actual surface of the roof for roof slopes expressed as x in 12 rise in run the roof pitch multiplier is determined by finding the square root of rise run 1.

If the roof isn t that cut up you may have a couple squares of waste. Starter strip the perimeter of the roof in lineal feet. The top row is a total of your roof area measurements with pitch added 5 for waste. Also show waste for valleys hips and or rakes and added to your squares.

A 7 5 variance of waste on a 30 square roof would be 2 33 squares. The sub total is 3977 70 x 1 08 4295 92 pitch has been added for 5 12 pitch. Total shingles needed the number of packs needed to cover the roof but does not add additional packs needed for ridge capping and. Note that in the last 3 4 years costs of roof shingles and many accessories have gone down by an average of 18 20 currently the us national average for benchmark architectural shingles is around 74 51 square or 25 per bundle.

That s because it is the smaller cut up hip roofs that can often have the highest waste percentage.