Irwin Builders Supply offers Pittsburgh area professional contractors quality building products from leading manufacturers. IBS has been an industry leader for over 60 years, distributing a wide range of building materials, supplies, and solutions throughout Pennsylvania, eastern Ohio, West Virginia, and northwest Maryland. The sales counter at IBS is manned by Experienced Career Professionals, with more than 100 years of total experience, ready to help you find the products you need. IBS also has a full compliment of contractor outside salesmen that follow your job through completion ensuring product quality and the satisfaction of the homeowner.