Fabrics Architects and engineers have long realized that waterproofing compounds themselves are highly water-repellent, but do not remain in place if applied alone. Reinforcement fabrics add strength and flexibility to the waterproofing agent, and provide the means for specified quantities to be built up in place. Koppers has a full line of reinforcement fabrics for this purpose. See Reinforcement Fabrics.  Return to General Roof Specification Information