A roof is a complex structure that features lots of angles. And it has to be covered with metal sheets or asphalt shingles entirely, if you want to protect the interior of the house against rain, snow, or humidity. Covering a roof requires very good math skills and extreme precision.

Before measuring the roof, check out the available roofing materials on the market and take note of their dimensions. This is very important because the future calculations will be based on the length and width of the roof and the length, width, and height of the required roofing materials.

In order to find out how many metal sheets or asphalt shingles you need for your roof, you have to divide the surface of the roof, expressed in square inches, by the surface of the roofing material, expressed in the same unit of measurement.

To calculate the surface of the entire roof, you have to multiply its length by its width. Pay attention to the angles of the roof too, even though you may need just a half of a shingle to cover a specific area that features a difficult angle.

In many cases, you would have to round the number of roofing materials to be able to obtain a whole number or integer, because you cannot purchase a half of a shingle for a certain corner of the roof, or 200 cm of a metal sheet, for another area of the roof.

Purchasing 24.6 shingles or 13.3 metal sheets would not be indicated; buying 25 shingles or 14 metal sheets is the right solution in this case. Metal and asphalt roofing comes in full sheets or shingles only, that is why you need to round the number to get an integer.

Professionals offering roofing services North West to residential users or industrial roofing North West say that the most popular metal sheets are around 40 inches wide and 10 feet long. To get an approximate number of metal pieces needed for your roof, divide the surface of the roof by 4800.

The number 4800 is obtained by multiplying 40 inches by 120 inches, which is the length of a metal sheet, expressed in inches, not in feet. A foot equals 12 inches. When you make calculations, always make sure to use the same unit of measurement.

Regarding the asphalt shingles, they come in bundles and are usually available in 30 cm by 90 cm. Once again, if you have calculated the surface of the roof in square inches, make sure to convert centimetres to inches. If you are not good at math, leave this to professionals offering domestic roofing services North West or industrial roofing North West.

The number of shingles that you need to purchase would be, in this case, represented by the surface of the roof, expressed in square inches, divided by 418.42 square inches. This decimal number is obtained by multiplying 11.81 inches by 35.43 inches, the width and length of a shingle, in inches.

These calculations do not necessarily have to apply to you. You can purchase metal sheets or asphalt shingles that feature totally different dimensions. The point is to measure the roof correctly and always use the same unit of measurement, when making the calculations.

Do you need an exact calculation to see how many roofing materials you need for your roof? Contact our team of professionals offering domestic roofing services North West http://www.greenwayroofingservices.co.uk and industrial roofing North West http://www.greenwayroofingservices.co.uk . Besides measuring the roof, we also deliver installation, repair, and maintenance works. For more information, visit our website.