Lintel: A horizontal structural member that supports the load over an opening, such as a door or window.

Liquid-Applied: A continuous roof membrane constructed in place using one or more coats to provide fully adhered, waterproof membranes that conform to all contours.

Listed: Equipment, materials or services included in a list published by an organization that is acceptable to the authority having jurisdiction (AHJ), and concerned with evaluation of products or services, that maintains periodic inspection of production of listed equipment or materials, or periodic evaluation of services, and whose listing states that the equipment, material or service meets appropriate designated standards, or has been tested and found suitable for a specified purpose.

Live Load: A transient, variable load that may be imposed by gravity, by the building’s occupants, or by the environment, such as seismic, hydrostatic (a water source), snow, or wind.

Lock Jam: The vertical side of a door frame where the locking mechanism is installed.

Lock Stile: The vertical side of the door itself where hinges are attached.

Loose-Laid Membrane: A membrane that is loosely laid over the substrate and anchored only at the roof’s perimeter and penetrations.

Low-Slope Roof: A roof having a slope of 1/4:12 up to 3:12.

Macro Viewpoint: Assessing the building from a distance for a wide view.

Make-Up Air: Air brought into a building from the outdoors through the ventilation system that has not been previously circulated through the system.

Manhole: A covered opening large enough to be physically opened; provides access to a storm sewer system.

Mansard Roof: A roof that rises by inclined planes from all four sides of a building. The sloping roofs on all four sides have two pitches, with the lower pitch usually very steep, and the upper pitch less steep.

Mantel: A shelf or horizontal ornament above a fireplace opening.

Manual: Capable of being operated by a person.

Material: Having significant importance, as in “material defect.”  This term is reserved for describing things of significant importance.

Material Defect: A condition of a commercial property, or any portion of it, that would have a significantly adverse impact on the value of the real property, or that involves unreasonable risk to people on the property. The fact that a structural element, system or sub-system is near, at or beyond the end of the normal useful life of such a structural element, system or sub-system is not, by itself, a material defect.

MBM: Modified Bituminous Membrane

MCS: Multiple Chemical Sensitivity

Means of Egress: A continuous and unobstructed path out of a building to a public way.

Mechanically Attached: A term used to describe a membrane that is attached to the substrate by means of fasteners (nails and plates); also commonly referred to mechanically fastened.

Mega Door: An overhead door that is exceptionally large and may require specialized knowledge or access to inspect and operate.

Membrane: A slightly flexible covering for a low-slope roof, often acting as the weatherproofing component.

MEP: Mechanical, Electrical, Plumbing

Metal Edge Flashing: Brake metal, sheet metal, or a metal extrusion that is secured at the perimeter of a roof to form a weathertight seal.

Mezzanine: A semi-permanent, freestanding stair-and-deck system, typically constructed of fiberglass grating, heavy-duty steel and/or aluminum, and installed between two permanent/original floors within an industrial or commercial building in order to provide an open space on and under which can be created informal office areas, storage for inventory, tools and industrial equipment, etc.

MICB: Master Inspector Certification Board

Micro Viewpoint: Assessing the building from close proximity.

Microbiologicals: Biological Contaminants

Modified Bitumen (MB): Also referred to as torch-down roofing or rubberized asphalt, composed of polymer-modified bitumen that saturates, impregnates, or fills and coats reinforcement fabric (polyester and/or fiberglass).

Mold: A form of fungus. Some molds can cause disease in humans.

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