Single-number rating used to compare and evaluate the performance of floor-ceiling constructions in isolating impact noise. The advantages of this rating system are positive values and the correlation with Sound Transmission Class (STC) values -- both providing approximately equal isolation at a particular value. The IIC rating is used by building agencies for specifying minimum sound-control performance of assemblies in residential construction.

The density of luminous power in lumens per a specified area.

Sound generated by impact on the floor or other parts of a building that is carried through the building.

An index of the extent to which a floor assembly transmits impact noise from a room above to the room below.

Obsolete rating system for floor-ceiling construction in isolating impact noise. INR ratings can be converted to approximate IIC ratings by adding 51 points; however, a variation of 1 or 2 points may occur.

The energy required to fracture a specimen when struck with a rapidly applied load.

Undisturbed soil.

A test for determining the resistance of a specimen fracture from a high-velocity blow.

An unintended substance present in a material/mixture as manufactured that was not an intentionally used substance in the production of the material/mixture. It may originate from the starting materials or be the result of secondary or incomplete reactions during the manufacturing process. For example, a chemical substance as supplied in commerce that is 99.0% pure is a mixture of the pure chemical substance and 1.0% of impurities. https://healthymaterialslab.org/tool-guides/hml-resources

The emission of visible light produced by heating.

The interest rate or adjustment standard that determines the changes in monthly payments for an adjustable rate loan.

The passage of air from indoors to outdoors and vice versa; term is usually associated with drafts from cracks, seams or holes in buildings. The process by which water soaks into the ground. Also called Percolation.

Footings supporting a single structural element, such as a column.

See Noncombustible.

A lamp employing an electrically charged metal filament that glows at white heat. A typical light bulb.

The amount of solar radiation on a given plane or surface.

The point at which two walls form an internal angle, as in the corner of a room.

A route of exposure by which substances enter the body through the actof breathing. https://healthymaterialslab.org/tool-guides/hml-resources

A mass of molten metal cast in a mold and solidified to be stored until used for forging or rolling into a finished product.

A route of exposure by which substances enter the body through the mouth. https://healthymaterialslab.org/tool-guides/hml-resources