Joe Grady's September 2004 column (Do It by the Book: Use the Right Backerboard for the Tile Application) incorrectly identifies the manufacturer for DensShield. DensShield [is] manufactured exclusively by Georgia-Pacific.
Also, DensShield conforms to more details in the TCA Handbook than detail F151-03, which was cited in the article for use with 8-inch-square or larger tiles. In fact, the more common floor detail is F146-03, which requires a minimum tile size of 2-by-2 inches over 5/8-inch plywood with joists spaced 16 inches o.c.