The Texas Board of Professional Engineers licenses engineers in Texas. http://www.tbpe.state.tx.us/
The Texas Section of the American Society of Civil Engineers is developing guidelines for residential foundations. The two publications are “Recommended Practice for the Design of Residential Foundations,” and “Guidelines for the Evaluation and Repair of Residential Foundations.” To find them, click on “Publications,” and then “Residential Foundation Guidelines.” http://www.texasce.org
Everything you always wanted to know about trees and subsidence can be found at Willowmead Publishing, where you can purchase P. G. Biddle’s book Tree Root Damage to Buildings. http://www.willowmead.co.uk
United States Gypsum Company tells all about gypsumboard at http://www.usg.com
Lots of information about ceramic tile can be found at http://www.ceramic-tile.com The site is the home of “Ask the Tile Man.” Another tile resource is at the Tile Council of America, Inc., http://www.tileusa.com/profile_main.html.