A Maryland contractor holding both FM 4991 certification through FM Global and UL Qualified Firestop Contractor status, working across Maryland, Virginia, Pennsylvania, West Virginia, DC, Tennessee and Georgia. Firestop work covers slab edge, curtain wall, head-of-wall joints and service penetrations, and sits alongside spray-applied fire-resistive materials and a concrete cutting and coring division — useful where a penetration has to be cut and then correctly resealed.