Note that all roof sheeting must extend at least 50mm beyond the fascia line to provide gutter overhang. Multiply this measurement by the Sheet Length Roof Slope Factor to find the length of the sheet required to span from the ridge to the fascia. On the roof plan, measure the distance from the line of the ridge to the outside of the fascia, which in the example we've provided is half the span or 4000mm. On complex roof shapes, extra may be needed to allow for wastage. Roughly 179m 2 of sheeting will be needed to cover the roof. If we apply our example, the equation is as follows: To find the area of your hipped roof, simply multiply your plan area by the Roof Slope Factor for the roof area. Before making the calculation, add gutter overhangs of 50mm. Accurate measurements must be taken from the actual roof frame before ordering roofing and rainwater products.Īs an example, take a typical hipped roof where all four roof sections have the same slope (30 degrees) and all hips are of equal length.įirst determine the area of the roof plan by multiplying the length of the roof by the width. Remember, these methods are for quick estimating purposes only. Our table of roof slope factors will help you do the maths when it comes to roof areas, sheet length and hip length.
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