How To Estimate Roofing Sheet

The first step in a free roofing estimate is measuring the roof dimensions.

How to estimate roofing sheet.

A roof s pitch is determined by how much it rises vertically for every foot it runs horizontally. To estimate roofing materials start by finding the total square footage of the roof and divide the number by 100 to determine the number of squares in the roof. Once you have the area you can divide by the area of a sheet of plywood to find the number of sheets needed. To accurately calculate the area of your roof you must first determine its slope or pitch.

Using the example values of a roof area of 210 square feet and an effective sheet size of 18 75 square feet 12 sheets are required as 210 divided by 18 75 equals 11 2. Gerard roofing sheet would generate more waste than long span roofing sheet. Multiply length by breadth. Since it takes 3 bundles of shingles to cover a square plan to purchase 3 bundles for each square.

You will need to express this size in terms of square feet. A 4 8 sheet of plywood is 32 ft 2. 4 3 sheets will be 5 sheets required. Number of roof sheets rounded off to highest number eg.

686mm 0 686 3. Assuming the ceilling sheet is 3 6m in length and 1 8m in breadth then area of roofing sheet 3 6 x 1 8 6 48m2 therefore total numbers of roofing sheets needed approximately is area of building allowance area of one roofing sheet 583 2 6 48m. The house base area is the area of land that the house covers and for more complex shapes can be estimated using the area calculator. Cover width entry in meters eg.

For cover width sizes please refer to our fibreglass or polycarbonate roof sheeting pages. Now lets add waste of 10 20 depending on the roofing material e g. Add 20 250 11 20 of 250 11 250 11m 50 02m total area of roofing sheets 300 13m. The following tools estimate the area of a roof as well as the amount of materials necessary to construct a roof of a given area.

So dividing the area of the roof by 32 will give you the number of sheets needed. Keep in mind that the average size of a roof is 1 700 square feet so your total will likely be 10 higher or lower than this figure. A roofing estimate is a process that lets a contractor and a client know what types of materials will be needed for a project. The length of roof sheets are manufactured to your requirements.