Impervious flooring. Water-based adhesives. Fly ash and slag pozzolans. Vapor retarders. Extreme surface pH. Fast-track scheduling. All are coming together and creating flooring failures.

Flatness, Levelness, F-Numbers, Straightedge: What do the numbers mean? Recent changes to ACI 117 provide new procedures for straightedge measurements for floor slab flatness. Under the revised standard, 1/8 inch in 10 feet is not a standard option...