How To Figure How Much Roofing You Need

To calculate the size of the roof you need to measure the size of the roof as if it were flat account for roof pitch calculate square footage and finally determine how many squares of material are required for the roof.

How to figure how much roofing you need. For roof pitches of 5 12 to 7 12 use a factor of 1 3. Measuring the amount of metal roofing you need is accomplished in various ways depending upon the style of your roof. Near ridge of the roof. If your roof pitch is 3 12 or 4 12 multiply by 1 25.

The calculator above can handle all of this simply enter the length width and pitch and it will determine the size of the roof in squares. To accurately calculate the area of your roof you must first determine its slope or pitch. While it is possible to estimate the amount of necessary materials using only the total roof area measurement as can be seen from the table depending how large the pitch of the roof the actual area of the roof can differ by up to 2 236 from the measured total area at a pitch of 24 12. How to figure metal roofing to use this panel length calculator enter whole numbers and decimals only.

Get the square footage of roof and divide it by 100 and it will give the number of squares you need and for every decimal number over 3 buy a bundle to achieve the amount of material. You can determine how much metal you will need for your roof. The first step in a free roofing estimate is measuring the roof dimensions. A roof s pitch is determined by how much it rises vertically for every foot it runs horizontally.

For example if your roof has valleys and dormers that will change the way you measure it. We plan to enable the use of fractions at a later time. Multiply the total area determined in step one by a correction factor to account for the roof pitch. Use 1 4 for up to a 9 12 pitch.

This correction factor will take into account the greater area of the roof due to the pitch. Calculate sheathing needed once you have the area you can divide by the area of a sheet of plywood to find the number of sheets needed. Based on your 1100 sq. Enter the diameter of the roof ridge vent gap 1 3 finally enter the coverage area width of the panels you plan to buy.

A 4 8 sheet of plywood is 32 ft 2. Thus a moderate 6 in 12 roof pitch means that the roof rises 6 inches vertically for every 12 horizontal inches it runs. You will need to express this size in terms of square feet. So dividing the area of the roof by 32 will give you the number of sheets needed.