They offer a complete line of waterfront solutions including seawalls, docks, piers, and gangways. They offer advanced solutions for vinyl seawalls, composite (fiberglass) seawalls, and aluminum seawalls. From large marinas to residential dock projects, CMI covers the spectrum. TimberGuard®Marine Timber and Piling: TimberGuard is designed to protect your waterfront investment whether it is a pier or a seawall. This is unmatched value for timber protection and style. They are leaders in the research and development of plastic and composite building materials, creating long-life, high-performance products such as siding, fencing, decking, windows, and advanced marine construction products.