Emseal Joint Systems Ltd., Westborough, Mass., offers AST self-adhering tape seal made from resilient, open-cell polyurethane foam impregnated with a water-based acrylic-modified asphalt emulsion. The tapes seal joint details from dust, air, wind-driven snow, and moisture in metal buildings and similar structures. They function as joint fillers in expansion/compression seals and as gasket-type seals in mechanically fastened, non-moving applications such as lap seams.