Zygrove Corp/z-brick Brands ZC017205 Gray Brick Facing - Carton 20 Carton Of 20 Liberty Gray Brick Facing Americana Decorative Brick Can Be Used On Interior &amp; Exterior Surfaces Easy To Cut Color Runs Through The Entire Brick Carries A UL Class 1 Fire Rating When Applied With Z Ment Mortar Adhesive Coverage Per Carton Is 3.5 SQFT Depending On Width Of Mortar Line