Terminology of Metal Roofing

You might think that you know it all,  particularly when it comes to your roof. You probably spend a lot of time learning the know-hows of metal roofing, shingles and even proper ventilation. Yet, it is important to bear in mind the understanding the terminologies of any subject that you wish to become a professional someday. Below are the metal roofing terms that you should remember. All in all, experience would always be the best teacher. Never miss a chance to take the opportunity of hands on roofing installation.

Metal Roofing terms



Batten is also known by many roofers or professional roofers as the Purlins. It is attached to the roofing system. The size can be 1x2xw wood strips to the rafters. In some cases, it is also called as the Hat Channel because of its shape. It is intended to anchor the roofing materials because chipboard sheets can most of the time not handle screw properly.

Class A, B, and C

Roofing system can be classified from class C up to class A. Obviously, class A is the premium type of roofing system which is fire resistance that can stand severe exposure of fire from the source or even from the outside of the building. Next in line would be, of course, the Class B roofing. It is also a fire-resistant roofing system, but this time, it can only handle moderate exposure to fire. The Class C types, on the other hand, are the ones that can only stand light exposure of fire.

Terminology of Metal Roofing


It is not the frame of the roofing system but the supporting framing of the building. It is the skin of the roof whereas this is where the metal roof will be installed. Most homes these days are using plywood decking. But there are other types of decking system and these are the tongue and groove, OSB (Oriented Strand Board) which is the cheapest option compared to others.


These are special pieces of trimmed materials that can prevent seepage of the water. There are Valley Flashing which is used in open valleys of the roof, the Plumbing Vent Flashing which prevents rainwater leaks and step flashing which is used for the vertical surface in order to meet a sloping roof plane.


It is also known as slope. It is the measure of how steep your roof would be. In any roofing, the pitch is one of the most important factors in order to determine the kinds of materials that can be used to the overall structure of the building. Usually, the higher the sleeper would be, the better because it benefits the drainage.


The underlayment is mostly made from woven black polypropylene. It is intended to stand against UV rays which the membrane itself is self-sealing. While the synthetic underlayment is superior over the felt paper. It is highly recommended to use high quality underlayment materials especially when you are planning to install metal roofing. This would prolong the service and at the same time, it keeps your interior cool.

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