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Definition of the term Weld

The joining of components together by fusing. In thermoplastics, refers to bonding together of the membrane using heat or solvents.

Definition of the term Base Ply

An asphalt-saturated and/or coated felt installed as the first ply with 4 inch laps in a built-up roof system under the following felts which can be installed in a shingle-like…

Definition of the term Well Casing

A steel or plastc pipe which serves as the lining of a well, preventing it from caving in and protecting ground water from contamination by surface water.

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