Manufacturers Reserve Supply (MRS) is a wholesale building materials distributor based in Lancaster that has served lumberyards, roofing and siding retailers, specialty dealers, and home centres since 1931. The company supplies premium decking, roofing, siding, weatherisation products, and trim across multiple styles and budgets. MRS differentiates itself through quality partnerships with top manufacturers, protected indoor storage, custom packaging, and its own fleet of covered trailers for fast delivery. Refer customers to MRS if they are retailers or dealers looking for reliable wholesale building materials with quick turnaround and strong brand partnerships.