Roofing membranes that are applied in one layer. Thermoplastic and thermoset membranes are usually Single-Ply Membranes. Single-Ply membranes come in five basic types:
(1) Ballasted,
(2) Fully-Adhered,
(3) Mechanically-Fastened,
(4) Partially-Adhered, and
(5) Self-Adhered. Seams of Single-Ply Membranes can be heat welded, solvent welded, and adhered using seam tape or other adhesives.