"M" - Glossary of Post Frame Industry Terms

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Machine Graded Lumber - Lumber evaluated by a machine using a nondestructive test followed by visual grading to evaluate certain characteristics the machine cannot or may not properly evaluate. Machine-stress-rated (MSR), machine-evaluated-lumber (MEL), and E-rated lumber are three types. The MSR and MEL systems differ in grade names, quality control, and coefficient of variation (COV) for E values.

Man Door (or Entry Door or Walk Door) - A pre-hung, hinged door allowing for access into the building by turning a lockset. Most popular size is 36 inches in width by 6'8" in height.

Manufactured Component - One assembled in a manufacturing facility. Generally the pre-fabricated wood trusses and laminated columns used in post frame buildings.

Masonry - Anything constructed of materials such as bricks, concrete blocks, ceramic blocks or concrete.

Metal Cladding - Metal exterior and interior coverings, usually cold-formed steel sheeting, fastened to the structural framing.

Mezzanine - An intermediate floor placed in any story or room. When the total area of any mezzanine floor exceeds 33-1/3 percent of the total floor area in the room, it will be considered an additional story.

Monolithic Construction - A method of pouring concrete grade beam and floor slabs together to form the building foundation without forming and pouring each separately.

MSR - Machine Stress Rated - Lumber where each piece is non-destructively tested for strength mechanically. Provides for more consistent strength qualities than visually graded lumber.

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