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Truss

An engineered and manufactured roof support member with "zigzag" framing members. Does the same job as a rafter but is designed to have a longer span than a rafter. Open, lightweight framework of members, usually designed to replace a large beam where spans are great.

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Turnkey

A term used when the subcontractor provides all materials (and labor) for a job.

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Truss Plate

A steel plate used to strengthen the joints in truss assemblies.

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Twist

Warping in which one or more corners of a piece o wood twist out of the plane of the piece.

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Truss-Framed System

An assembled truss uint made up of a floor truss, wall stud, and a roof truss.

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Tub trap

Curved, "U" shaped section of a bath tub drain pipe that holds a water seal to prevent sewer gasses from entering the home through tubs water drain.

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Tufted Construction

Carpet formed by stitching the pile yarn through the backing material.

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Two-Way Flat Plate

Reinforced concrete construction in which the main reinforcement runs in two directions and both surfaces are flat planes and it is supported by columns.

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Two-Way Concrete Joist System

Floor and roof construction that has two perpendicular systems of parallel intersecting joists.

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Turpentine

A petroleum, volatile oil used as a thinner in paints and as a solvent in varnishes

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Ultimate Strength

The maximum stress, such as tensile, compressive, or shear, that a material can withstand.

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U of C

University of California, an independent fire-testing laboratory.

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UL (Underwriters' Laboratories)

An independent testing agency that checks electrical devices and other components for possible safety hazards.

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UL

Underwriters Laboratories Inc., founded by NBFU, and now operated in affiliation with American Insurance Assn. UL is a not for profit laboratory operated for the purpose of testing devices, systems and materials as to their relation to life, fire and casualty hazard in the interest of public safety.

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U Value

Coefficient of heat transfer, "U" equals 1 divided by (hence, the reciprocal of) the total of the resistances of the various materials, air spaces and surface air films in an assembly. See Thermal Resistance.

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Two-Way Flat Slab

Reinforced concrete floor or roof construction in which a two-way flat plate is supported by columns with drop panels or column capitals.

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UBC

Uniform Building Code - document promulgated by the International Conference of Building Officials.

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Ultrasonic Testing

A method of non-destructive testing of materials that uses high frequency sound vibrations to find defects in the material.

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Ultra-Low Emitting Formaldehyde (ULEF)

Products with a ULEF certification have ultra-low emitting formaldehyde resins which have been shown to have formaldehyde emissions below the limits established by CARB Phase 2. The ULEF certification originated with CARB, and has since been adopted by the EPA for the TSCA Title VI regulation. https://healthymaterialslab.org/tool-guides/hml-resources