Title: Unit 10 Glossary
Course: HAC 140 Weatherization > Section: HAC 140 Weatherization

Unit 10 Glossary

Terms

Term | Definitions
Board feet | A measurement of lumber volume. A board foot equals 144 cubic inches of wood.
Cubic feet per minute (CFM) | A measurement of air movement past a certain point or through a certain structure. Used in pressure diagnostics to quantify air leakage.
Cure | Used in reference to spray foam insulation: The process of expanding and hardening. Many manufacturers consider the insulation cured when residue-free trimming is possible. Off-gassing can occur f ...
Direct leakage | Air enters and exits at same location; occurs at direct openings to outdoors.
Exfiltration | This term describes the movement of air out of a building. Often refers to warm air leaving a building due to pressurization, infiltration, wind, stack effect, and/or convective flow.
Expanding foam | An insulation product designed to expand and harden upon contact with the air. Available in canisters with spray nozzles that make it easy to apply foam in a wide variety of situations.
IC rated | Insulation Contact rating for light fixtures. IC housings must be installed wherever insulation will be in direct contact with the housing.
Indirect leakage | When air leaks into the home at one point, and out at a different opening. Indirect leakage is more difficult to find, and is associated with interior bypasses or chaseways of a home's interstitia ...
Infiltration | The movement of air into a building through cracks and penetrations in the building envelope. Cold air often enters the structure due to depressurization, exfiltration, wind, stack effect, and/or ...
Knob and tube wiring | Early standardized method for electrical wiring in homes consisting of insulated copper conductors supported by porcelain knobs (along their lengths) and tubes (when passing through framing member ...
Lead-safe weatherization (LSW) | Methods, techniques, and engineering controls assuring that workers and home occupants are not exposed to harmful lead-based paint.
Material Safety Data Sheets (MSDS) | Designed to provide both workers and emergency personnel with the proper procedures for handling or working with a particular substance. An MSDS includes information such as toxicity, health effec ...
Non-expanding foam | Spray foam that does not expand. Used in window and door jambs, and other constricted spaces where expanding foam may distort building materials and negatively impact operation.
One-part foam | One-part foam comes in spray cans (e.g., Great Stuff) and spray guns with screw-on cans. One-part foam is best suited for filling gaps and holes less than ¾”.
Polyurethane foam | A versatile plastic foam insulation, usually yellow in color.
Positive-pressure, supplied-air respirator | Has its own air compressor to supply fresh air to the worker, and can use a mask or hood.
R-value | A measurement of thermal resistance for materials and related surfaces.
Silicosis | A serious lung disease caused by inhaling particulate matter.
Thermal envelope | The continuous layer of building components, such as insulation, that retard conductive heat flow. See also thermal boundary.
Two-part foam | A triple-expanding foam appropriate for larger and more numerous air leaks, and for insulating crawl space walls and other big jobs. Two-part foam comes in portable two-tank kits and truck-mounted ...
Ventilation | Controlled air leakage usually created with mechanical exhausting devices such as fans and dryers.