Roofing Terminology
(Click on a letter to learn more)
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Manufacturer's Bond
A security company's guarantee that it will stand behind a manufacturer's liability to finance membrane repairs occasioned by ordinary wear within a period generally limited to 5, 10, 15, or 20 years.
Mechanically Fastened Membranes
Membranes attached at defined intervals to the substrate.
Membrane
A flexible or semi-flexible roof covering or waterproofing layer, whose primary function is the exclusion of water.
Metal Flashing
Metal flashing is frequently used as through wall flashing, cap flashing, counterflashing or gravel stops.
Mildew
A superficial coating or discoloring of an organic material due to fungal growth.
Mineral Fiber Felt
A felt with mineral wool as its principal component.
Mineral Granules
Opaque, natural, or synthetically colored aggregate commonly used to surface cap sheets, granule-surfaced sheets, and roofing shingles.
Mineral Stabilizer
A fine, water-insoluble inorganic material, used in a mixture with solid or semi solid bituminous materials Mineral Surfaced Roofing: built up roofing material whose top ply consists of granule surfaced sheet.
Mineral Surfaced Roofing
Built up roofing material whose top ply consists of granule surfaced sheet.
Mineral Surfaced Sheet
A felt that is coated on one or both sides with asphalt and surfaced with mineral granules.
Modified Bitumen
Composite sheets consisting of a polymer (e.g., atactic polypropylene (APP), or styrene butadiene styrene (SBS)) often reinforced and sometimes surfaced with various types of mats, films, foils and mineral granules.
Moisture Relief Vent
Venting device through the roofing membrane to relieve moisture vapor pressure from within the roof assembly.
Mole Run
A meandering ridge in a roof membrane not associated with insulation or deck joints.
Mop And Flop
An application procedure in which roofing elements (insulation boards, felt plies, cap sheets, etc. are initially placed upside down adjacent to their ultimate locations, are coated with adhesive and are then turned over and applied to the substrate.
Mopping
An application of hot bitumen applied to the substrate or to the felts of a built up roof membrane with a mop or mechanical applicator.
Mopping (Solid)
A continuous mopping of a surface, leaving no unmopped areas.
Mopping (Spot)
A mopping pattern in which hot bitumen is applied in roughly circular areas, leaving a grid of unmopped, perpendicular bands on the roof. A mopping pattern in which hot bitumen is applied in roughly circular areas, leaving a grid of unmopped, perpendicular bands on the roof.
Mopping (Strip)
A mopping pattern in which hot bitumen is applied in parallel bands.
Mud Cracking
Surface cracking of surface material resembling dried cracked earthen mud.
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