Westbrook Block is a proud producer of Underwriters Laboratories (UL) Approved Fire-Rated CMU in both Light Weight and Normal Weight densities in 2-, 3- and 4-hour configurations.
Because there no apparent difference in appearance between a standard CMU and a UL Fire-Rated CMU, Westbrook Block marks the inside core of each UL Fire Rated CMU with a raised “Frog.” In the event the design professional, building committee or local governing authority requires further assurance that the CMU used in fire walls are indeed Underwriters Laboratories Fire-Rated, individual Fire-Rated CMU can be individually marked with the UL logo. Additionally, a UL Certificate is delivered to the job site so that the contractor can make it available to local building officials.
*Underwriters Laboratories Inc. (UL) is an independent third party product safety testing and certification organization. UL has tested products for public safety for over a century. Each year more than 17 billion UL Marks are applied to products worldwide.
Westbrook Block UL License Number: R18597