What's the best way to do this? Below is from Eric Gurney 7/21/2000 = which is the best I could find with google...
From =
Fasteners: Galvanized roofing nails, 1 1/2" (38 mm) long with hot-dipped =
galvanized coating for use with wood framing. Nails should meet Federal=20 Specification #FF-N105B/type 2 style 20. Custom Concrete Backerboard = Screws=20 or equivalent, 1 1/4" (32 mm) long, for use with wood or 20 gauge steel=20 framing.=20
Underlayment: Using a 1/4" (6 mm) square-notched trowel, apply a setting = bed=20 of latex-modified mortar to the subfloor or base. Immediately laminate =
1/2"=20 WonderBoard Concrete Backerboard to subfloor base, leaving a 1/8" - = 3/16" (3 - 5 mm) space between boards at all joints and corners. Stagger = joints so=20 they do not line up with underlying substrate joints. Fasten backerboard =every 6" - 8" (15.2 - 20.3 cm) o.c. throughout board field and around = all=20 edges while setting bed mortar is still workable. Around perimeter of = each=20 board, locate fasteners within 1/2" - 2" (1.2 - 5.1 cm) of edge. Fill = all=20 joints and corners solid with latex-modified mortar. Taping of floor and =
counter joints is not required.=20
Sam