 WINCHESTER, Va.--BUSINESS WIRE--Trex Company, Inc. NYSE:TREX, the worlds 1 brand of composite decking and railing and leader in high-performance, low-maintenance and eco-friendly outdoor living products and a leading national provider of custom-engineered commercial railing systems, today reported financial results for the first quarter ended March 31, 2021. Sustained demand for Trex Residential products and accelerated market share gains from wood drove first quarter sales growth, layin 