Wonderboard from Custom Building Products
13001 Seal Beach Blvd.
Seal Beach, CA 90740
Phone: 562-598-8808
www.custombuildingproducts.com

Durock from USG Corp.
PO Box 806278
Chicago, IL 60680
Phone: 800-874-4968
www.usg.com

Hardibacker
James Hardie Building Products, Inc.
10901 Elm Avenue
Fontana, CA 92337
Phone: 800-426-4051
www.jameshardie.com/backerboard