Wash. Admin. Code § 51-11C-20221

Current through Register Vol. 25-01, January 1, 2025

Section 51-11C-20221 - Section C202.21-U

U-FACTOR (THERMAL TRANSMITTANCE). The coefficient of heat transmission (air to air) through a building component or assembly, equal to the time rate of heat flow per unit area and unit temperature difference between the warm side and cold side air films (Btu/h · ft² · °F) [W/(m² · K)].

UNCONDITIONED SPACE. An enclosed space within a building that is not a conditioned space and that is not categorized under Section C402.1.1. Crawlspaces, attics and parking garages with natural or mechanical ventilation are not considered enclosed spaces.

UNHEATED SLAB-ON-GRADE FLOOR. A slab-on-grade floor that is not a heated slab-on-grade floor.

UNIFORM ILLUMINATION. A quality of illumination delivered by a lighting system typically comprised of similar fixtures mounted at a regular spacing interval. This lighting system provides a uniform contrast ratio of no greater than 5:1 maximum-to-minimum ratio throughout the entire area served, including task areas.

Wash. Admin. Code § 51-11C-20221

Amended by WSR 16-03-072, Filed 1/19/2016, effective 7/1/2016

Amended by WSR 22-14-091, Filed 7/1/2022, effective 7/1/2023

Reviser's note: The brackets and enclosed material in the text of the above section occurred in the copy filed by the agency.

Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. 13-04-056, § 51-11C-20221, filed 2/1/13, effective 7/1/13.