Glossary of Construction Terms

Do you ever feel as if your contractor is selling you polyisocyanurate foam when what you really needed was a setback thermostat? Here is a handy guide to common (and not so common) construction terms. Scroll through the glossary below or sort by the letter that starts the word you're looking for. For example, to find polyisocyanurate foam, select P and click Submit.

A (7) | B (6) | C (18) | D (8) | E (9) | F (8) | G (2) | H (4) | I (1) | J (1) | L (4) | M (3) | O (2) | P (11) | R (10) | S (19) | T (7) | U (1) | V (1) | W (4) | Z (2)
Title Definition

A type of black plastic pipe commonly used for waste water lines.


A sum of money set aside in the construction contract for items which have not been selected and specified in the construction contract. Best kept to a minimum number and used for items who's choice will not impact earlier stages of the construction. For example, selection of tile as flooring may require an alternative framing or underlayment material.

Arc Fault Current Interrupters AFIs or AFCIs

These are new electrical safety devices and are becoming part of the electrical codes. AFIs are designed to prevent electrical fires and should not be confused with GFIs. AFIs are recom