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Mansard Roof

A type of roof style containing two sloping planes of different pitch on each of four sides. The lower plane has a much steeper pitch (almost wall-like) than the upper, often approaching vertical. Similar to gambrel roof...

Mats

The general term used for the base material of shingles, typically made of a waterproof fiberglass.

Membrane

This refers to the material that functions as waterproofing. It is usually employed on nearly flat or completely flat roofs to prevent leaks and move water off the roof...

Mineral Stabilizers

Finely ground limestone, slate, trap rock or other inert materials added to asphalt in shingles to increase durability and resistance to fire and weathering.