19 Uncoupling and drainage membranes in the nature of floor underlayments; Membranes for use as floor underlayments, namely, flooring underlayments; Composite tile flooring assembly comprised of modular screened systems, namely, non-metal tile flooring; Floor covering drainage system, namely, plastic subfloor panels that are used beneath floor tiles and mortar beds to form a drainage system for removing water that has seeped through upper layers; Accessory hardware for laying floor and wall tiles, namely, non-metal expansion joints for floors and walls, non-metal drywall corner bead, building materials in the nature of non-metal movement-absorbing profile for tile joints and corners, and subfloor panels for draining waterproof tile surfaces; Gutter support systems made primarily of plastic for roofs, balcony areas and terrace areas composed of gutter support profiles, gutters, pipes, pipe fittings, gutter hooks, pipe clamps, and gutter and pipe connectors; Membranes for use as floor underlayments for carrying heating and cooling tubes or cables; building materials in the nature of thin-set mortars; Building material, namely, tile and panel substrates in the nature of flooring underlayments composed primarily of non-metal materials