A Denver jury has awarded a small Washington company $20.3 million plus legal fees in its antitrust lawsuit against Johns Manville Corp., the Denver-based building products maker owned by Berkshire Hathaway Co. Thermal Pipe Shields Inc., or TPS, based in Stanwood, Wash., is a maker of pipe support systems that previously had purchased calcium silicate or “calsil” insulation from Johns Manville, which controlled nearly the entire market for that product. TPS in early 2018 announced it would make the insulation itself with the help of a Chinese manufacturer that Johns Manville had previously contracted with.