 PITTSBURGH--BUSINESS WIRE--Limbach Holdings, Inc. Nasdaq: LMB Limbach or the Company today announced its financial results for the year ended December 31, 2020. Despite the impact of the global pandemic, Limbach was able to generate year over year revenue growth, substantially increase profitability, and improve cash flow during 2020. Most notably during 2020, gross margin increased 130 basis points to 14.3 contributing to a net income of 5.8 million and an increase of approximately 