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About Us

Compotite Shower Pan was founded in Los Angeles in 1938 to manufacture and market “Compotite”, a patented material developed by G.A. Morthland as a waterproofing substitute for lead shower pans in homes. In 1958, the company was incorporated and soon Compotite was included in all model plumbing codes and sold nationwide to waterproof shower floors under a thick-bed mortar setting of ceramic tile or marble.

COMPOSEAL Blue Vinyl Shower Pan was introduced in 1979. Because of its popularity, ease of installation and economic price, it replaced the old Compotite completely by 1985. COMPOSEAL is made from high density PVC resins and calendered into a strong waterproof, puncture resistant, chemical resistant and mildew resistant membrane. It meets or exceeds the requirements of the three major plumbing codes: UPC/IAPMO, SBCCI, BOCA and the new International Plumbing Code. It also meets the ASTM and Ceramic Tile Institute requirements for non-bonded waterproof membranes. The required logos for these agencies are printed every 2 feet on the membrane for easy on-site certification by the building inspector. COMPOSEAL is sold through more than 450 tile and plumbing wholesale distributors in 100 foot rolls, 4, 5 or 6 feet wide, in 40 mil gauge ( 40/1000″ or 1/25″ thick). COMPOSEAL 30 mil is also available in UPC code areas.

In 1992, COMPOSEAL GOLD 40 mil bondable waterproof and crack suppression membrane for use with thin-set tile or marble installations was added to Compotite’s product line. COMPOSEAL GOLD meets the American National Standard for Waterproofing Membranes as well as the Standard for Crack Isolation Membranes for Thin-set Ceramic Tile and Dimensional Stones Installations, ANSI A118.10 and ANSI A118.12, and is sold in 90 foot rolls, 5 feet wide through tile distributors across the country. In 1998 COMPOSEAL WHITE GOLD 50 mil was introduced to give added sound control protection, providing a sound rating of IIC 66 and STC 66 in above grade ceramic tile installations over a 6” concrete slab floor above a suspended ceiling. Prospec (formally Bonsal American) has marketed COMPOSEAL products to the tile industry in the Eastern US since 1994.

COMPOSEAL products are manufactured in the US and warehoused in Reno,NV; Dallas,TX; Birmingham,AL; St. Petersburg,FL; and Winchester,VA. Compotite is a privately held California Corporation. Joan M. Hutchins succeeded her father, Andrew Morthland, as CEO in 1988. She, and her sister, Patricia Draper have 5 sons and one daughter between them. The Los Angeles office, located in the original 1938 warehouse, is managed by Sonia Puc, succeeding Anna Evans, who retired in 2013 after 31 years with Compotite. For further information or history, e-mail us at


Other Website Links Building Systems Design software for construction specifications ARCAT supplies CAD details and BIM Systems for specification writers. Prospec (formally Bonsal American) building products manufacturer, markets Compotite products in Eastern US. Sweets Directory of Building Products Find COMPOTITE CORP. in Div. 7&9. Tile Council of North America Handbook for correct tile installation National Tile Contractors Association National Association of Home Builders catalog of building products and services, a resource guide for builders and remodelers

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