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M  
Meter
MANSARD  
A decorative steep sloped roof on the perimeter of a building.
MANSARD ROOF  
(1) A steeper roof that terminates into a flat roof at its high point; (2) A type of roofing containing two sloping planes of different pitch on each of four sides. The lower plane has a much steeper pitch than the upper, often approaching vertical. Contains no gables.
MASONRY  
Anything constructed of such materials as bricks, stone, concrete blocks, ceramic blocks or concrete.
MASTIC  
See ASPHALT PLASTIC ROOFING CEMENT and ASPHALT ROOF CEMENT.
MANUFACTURER'S BOND  
A security company's guarantee that is 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.
MASONRY  
(1) Stone work or brick work; (2) The work done by a mason.
MASTIC  
(1) A trowelable mixture of cutback bitumen and mineral stabilizers, including asbestos or other inorganic fibers; (2) Trowelable, plastic mixture of bitumen and asbestos (or other inorganic) reinforcing fibers and a solvent (a stiffer more sag resistant material than plastic cement). See ASPHALT MASTIC, FLASHING CEMENT, PLASTIC CEMENT and ROOF CEMENT.
MAT  
A thin layer of woven, non-woven or knitted fiber that serves as reinforcement to the material or membrane.
MATERIAL SAFETY DATA SHEETS  
A written description of the chemicals within a product, and pertinent other data including such things as safe handling and emergency procedures. In accordance with OSHA regulations, it is the manufacturer's responsibility to product an MADS and the employer's responsibility to communicate its contents to employees.
MBDA  
Systems Builders Association (formerly Metal Builders Dealers Association).
MBMA  
Metal Building Manufacturers Association
MCA  
Metal Construction Association
MECHANICAL EQUIPMENT SCREEN  
A partially enclosed rooftop structure used to aesthetically conceal HVAC electrical or mechanical equipment from view.
MECHANICALLY- FASTENED MEMBRANES  
Generally used to describe membranes that have been attached at defined intervals to the substrate. Mechanical fastening may be performed with various fasteners and/or other mechanical devices, such as plates or battens.
MEMBRANE  
(1) A continuous flexible (or semi-flexible) roof covering or waterproofing layer that forms the water control element of a roofing system. It is normally assembled on site from single or multiple plies of material, e.g. polyvinyl chloride roofing in single ply and bituminous felt roofing in multiple ply; (2) A flexible or semi-flexible roof covering or waterproofing layer, whose primary function is the exclusion of water; (3) A flexible or semi flexible material, which functions as the waterproofing component in a roofing or waterproofing assembly, and whose primary function is the exclusion of water.
MESH  
The square or circular opening of a sieve.
METAL FILM  
A layer of foil made from a single metallic substance or form an alloy, that is laminated to a membrane during manufacture. The metal foil serves as the weathering surface of the membrane or flashing material.
METAL FLASHING  
Accessory components fabricated from sheet metal and used to weatherproof terminating roof covering edges. Frequently used as through-wall flashing, cap flashing (coping), counterflashing, step flashing, gravel stops, etc. See FLASHING.
METAL ROOF PANEL  
An interlocking metal sheet having a minimum installed weather exposure of 3 square feet per (279 mm?2) sheet.
METAL ROOF SHINGLE  
An interlocking metal sheet having an installed weather exposure less than 3 square feet (279 mm2) sheet.
METER  
Unit of length measurement in the metric system, equal to 39.37 inches.
METRIC INFORMATION  
Visualizing Metric Measurements: Some basic comparisons between the Imperial and metric systems may assist in visualizing metric measurements.

• one millimeter (mm) is about the thickness of a dime
• one meter (m) is about 3" longer than a yardstick
• a 10 kilometer (km) race is about 6 miles
• a 175 yard, par 3 golf hole measures 160 meters (m)
• one square meter is the approximate area of a desk top
• one roof square is approximately 9.3 square meters (m2)
• a roll of polymer modified roofing weights about 30 kilograms (67 lb.)
• a 25-pound per square interply mopping is 1.2 kilograms per square meter (kg/m2)

mg  
Milligram
Mg  
Megagram
mi  
Mile
MICA DUST  
Crystallized complex slilicate materials that are pulverized into dust form for use as a release agent. See TALC.
MICROBIOLOGICAL RESISTANCE  
The ability of a material to resist attack and degradation by various air- and soil-borne microorganisms.
MICRON  
One millionth (10-6) of a meter.
MIL  
A unit of measure; one mil is equal to 0.001 inches or 25.400 microns, often used to indicate the thickness of a roofing membrane.
MILLIMETER  
(1) A unit of thickness or length; 1,000 millimeters = 100 centimeters = one meter; (2) A unit of measure equal to one thousandth (0.001) of a meter or 0.03937 inches.
MIMA  
Mineral Insulation Manufacturers Association
min  
Minute
MINERAL FIBER  
Inorganic fibers of glass, asbestos or rock (mineral wool).
MINERAL FIBER FELT  
A felt with mineral wood as its principal component.
MINERAL GRANULES  
(1) Opaque, natural, or synthetically colored aggregate commonly used to surface cap sheets, granule-surfaced sheets, and roofing shingles; (2) Natural or synthetic aggregate particles, ranging in size from 500 um (1 um = 10-6 m) to 1/4" diameter, used to surface cap sheets, asphalt shingles, and some cold-process membranes. See GRANULES.
MINERAL STABILIZER  
A fine, water-insoluble inorganic material, used in a mixture with solid or semi solid bituminous materials.
MINERAL SURFACED ROOFING  
(1) Built-up roofing materials whose top ply consists of a granule surfaced sheet; (2) Roofing materials whose sheet is coated on one or both sides with asphalt and surfaced with mineral granules; (3) A roofing sheet that is coated on one or both sides with asphalt and surfaced with mineral granules.
MINERAL-SURFACED SHEET  
(1) A felt that is coated on one or both sides with asphalt and surfaced with mineral granules; (2) Asphalt-saturated felt, coated on one or both sides and surfaced on the weather-exposed side with mineral granules.
mj  
Megajoule
mm  
Millimeter
MODEL CODES  
A compilation of standards or codes established to provide uniformity in regulations pertaining to building construction. Examples: ICBO (International Conference of Building Officials); BOCA (Buildings Officials an Code Administrators); SBS (Standard Building Code).
MODIFIED BITUMEN  
(1) A bitumen modified through the inclusion of one or more polymers (e.g., Atactic polypropylene, styrene butadiene styrene, etc.); (2) Composite sheets consisting of a polymer modified bitumen often reinforced and sometimes surfaced with various types of mats, films, foils and mineral granules; (3) A broad class of materials (and blends) that can be used to change the performance characteristics of a roofing grade asphalt.
MODIFIED BITUMEN ROOF COVERING  
One or more layer of polymer modified asphalt sheets. The sheet materials shall be fully adhered or mechanically attached to the substrate or held in place with an approved ballast layer.
MODULUS OF ELASTICITY  
The ratio of stress corresponding to strain (within the elastic limit of a material); it is a measure of the stiffness of a material.
MOISTURE CONTOUR MAP  
A map used to graphically defined the location of moisture within a roof assembly after a moisture scan has been performed.
MOISTURE RELIEF VENT  
A venting device installed through the roofing membrane to relive moisture vapor pressure from within the roofing system.
MOISTURE SCAN  
The use of a mechanical device (capacitance, infrared or nuclear) to detect the presence of moisture within a roof assembly. See NON-DESTRUCTIVE TESTING.
MOLE RUN  
A meandering buckle or ridging in a roof membrane not associated with insulation or deck joints.
MONOMER  
(1) A simple molecule that is capable of combining with a number of like or unlike molecules to form a polymer; (2) Class of molecules with molecular weight ranging roughly between 30 and 250, capable of combining into huge, polymeric macromolecules, 100 to 10,000 times as large as the basic monomeric molecules, through chainlike repetition of the basic monomeric chemical structure.
MOP-AND-FLOP  
(1) 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; (2) 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 or bitumen; and are then turned over and applied to the substrate.
MOPPING  
(1) The process of applying hot bitumen with a mop or mechanical applicator to the substrate or to the felts of a built-up roof membrane; (2) The application of hot bitumen, with a roofer's hand mop or mechanical applicator, to the substrate or to the felts of a bituminous membrane.

Solid Mopping: A continuous mopping of a surface, leaving no unmopped areas. See SOLID MOPPING.

Spot Mopping: A mopping pattern in which hot bitumen is applied in roughly circular areas, generally about an 18" diameter, leaving a grid of unmopped, perpendicular bands on the roof. See SPOT MOPPING.

Sprinkle Mopping: A random mopping pattern in which heated bitumen beads are strewn onto the substrate with a brush, broom or mop. See SPRINKLE MOPPING.

Strip Mopping: A mopping pattern in which hot bitumen is applied in parallel bands. See CHANNEL MOPPING and STRIP MOPPING.

mph  
Miles Per Hour
MUD CRACKING  
Surface cracking of a material where the degraded material appears similar to dried, cracked earthen mud.
mym  
Myriameter
   
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