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Thanks for the warm welcome! Trex does expand and contract, though I'm not sure what you are comparing it to. The gapping requirements are 1/4" width to width when installed above 40 degrees F and 3/8" below 40 degrees F. End to end gapping should be 1/8" above 40 F and 3/16" below & abutting a solid surface should be 1/4" above 40 F and 1/2" below.
Trex is similar to wood and responds to heat in the same way. Darker colors of wood get hotter than lighter colors and Trex does the same. In an independent study, Trex was comparable to surface temperatures of pressure treated wood.
Mushrooming can be prevented by using a composite decking screw. Many manufacturers make color-matched composite screws for our products.
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