3 Common Metal Roofing Installation Mistakes

What You'll Need
Measuring tape

When installing metal roofing in a do it yourself project, several mistakes can be made. The two most common metal roofing installation mistakes can be avoid with a little preparation and time. The two mistakes are improperly estimating the size of your roof, and as a result, wasting costly materials. These mistakes will most likely cost you more time and money in the end, than it would cost to ensure that you are prepared properly. These tips will also help you avoid unwanted frustration when taking on such a project as installing metal roofing to a building.

Step 1 – Properly Measuring Your Roof

You will need to measure the roofing coverage surface in roofing squares to know the size for your metal roof installation. (A roofing square is 100 square feet.) Using your tape measure, you will need top measure the ground dimensions of the building. Do this by measuring the length and width of the outer walls. You may wan tot be careful and have another person assist you in the measuring of the roof coverage. This is another way to ensure you do not make a costly mistake when getting these measurements since they will determine the amount of metal roofing you will need to purchase. Multiply the width by the length to get the floor level area. Add on the proper amount for the roof over hangs for a more accurate measurement of your metal roof.

Step 2 – Converting You Measurements Into Roofing Squares

Once you have multiplied the length and and width of the outer walls and added the correct amounts of the overhangs you are ready to convert that number into roofing squares. This is done by dividing the total area by 100. An example would be if you divided 2,000 square feet by 100 then you would get a surface size of 20 roofing squares.

Step 3 – Adjusting Roofing Slope by Roof Pitch

Take the two dimensional ground measurements you have obtained and convert them into a 3 dimensional roof measurements. To do this you will need to be careful since this step in the process is where many people tend to make mistakes. This can be true when you are installing a complex metal roof. To avoid costly, frustrating mistakes in calculating your metal roofing slope / steepness, first determine the pitch of your roof. A low slope rises 3 ht for every 12 ft of the horizontal base. A high pitch can range from 1.41 to 1.7.  A 1.54 multiplier can be used to calculate a high and slight, to a moderate pitch roof. Now take the number you have determined fits the  pitch of your roof and multiply it by the roofing squares  for this roof. Now you will have a proper number for the amount of metal roofing you will need to obtain to compete your metal roof installation.