Roofs on any structure, whether they are commercial, residential, industrial, agricultural, etc. are generally categorized by one thing...their slope.
The slope of a roof is really the pitch or how steep it is. Certain types of roofing materials (asphalt shingles for example) can only be installed on a roof that has a certain pitch. The pitch is determined by how many inches it rises vertically over 12 inches horizontally. So if you hear one of our staff members refer to pitch of your roof as "4-12", that simply means that your roof rises 4 inches for every 12 inches it extends horizontally (runs).
To make things simpler for you, we have broken up our roofing materials area into two categories: Flat Roofs and Sloped Roofs. We did this because roofing materials for sloped roofs shouldn't be used for flat roofs and vice versa.
If you are unsure about what type of roof you have, the easiest way to tell is simply to look at it. If you are standing on the ground and the roof surface is plainly visible, your roof is sloped. If you can't see the roof surface easily or from the ground, the roof is probably a flat roof. Remember, if you have any questions about your roof or whether it should be replaced, please Contact Us and we will be more than happy to give you a free inspection!