The wearing or abrading of one material against another under extreme pressure.

Corrosion that develops by galvanic action when two dissimilar metals are in contact in the atmosphere.

The end, upper, triangular area of a home, beneath the roof. Uppermost portion of the end wall of a building that comes to a triangular point under a sloping roof.

A valve that lets you completely stop—but not modulate—the flow within a pipe.

A contractor who enters into a contract with the owner of a project for the construction of the project and who takes full responsibility for its completion, although the contractor may enter into subcontracts with others for the performance of specific parts or phases of the project.

An elevator with the traction sheave connected to a spur gear that is driven by a worm gear connected to the shaft of the electric motor.

A large or principal beam of wood or steel used to support concentrated loads at isolated points along its length. Beam, especially a long, heavy one; the main beam supporting floor joists or other smaller beams.

The trench or area in the yard where the gas line service is located, or the work of installing the gas service to a home.

Ground Fault Circuit Interrupter- an ultra sensitive plug designed to shut off all electric current. Used in bathrooms, kitchens, exterior waterproof outlets, garage outlets, and "wet areas". Has a small reset button on the plug.

A steel plate attached to both sides at each joint of a truss. Sometimes called a fishplate or gusset.

Hollow clay tile products with glazed faces typically used to build interior walls.

An inorganic mixture that has been fused at a high temperature and cooled without crystallization.

- The process of installing glass, which commonly is secured with glazier's points and glazing compound.

Bonding agents made from animal and vegetable products.

- A structural beam composed of wood laminations or lams. The lams are pressure bonded with adhesives to attain a typical thickness of 1 ½" . (It looks like 5 or more 2 X 4's are glued together).

A structural wood member made by bonding together laminations of dimension lumber.

Ground level, or the elevation at any given point. Also the work of leveling dirt. Also the designated quality of a manufactured piece of wood. 1. Related to soil, the elevation or slope of the ground.2. In relation to lumber, a means of classifying lumber or other wood products based on specified quality characteristics.

A finishing paint material. Forms a hard coating with maximum smoothness of surface and dries to a sheen or luster (gloss)

- A foundation wall that is poured @ level with or just below the grade of the earth. An example is the area where the 8' or 16' overhead garage door "block out" is located, or a lower (walk out basement) foundation wall is poured A ground-level reinforced structural member that supports the exterior wall of a structure and bears directly upon columns or piers.

A valve that lets you adjust the flow of water to any rate between fully on and fully off. Also see gate valve.