Metal building construction Pre-engineered and conventional metal building systems; structural roof and wall systems, insulated metal panels, standing-seam roofing, thermal and air barriers, flashing, transitions, openings, corrosion protection, wind-load requirements, and water-intrusion prevention. Plumbing design coordination Domestic water, sanitary and storm systems, oil-water separation where applicable, compressed airandspecialty servicepiping,gassystem where used, equipment connections, backflow prevention, code compliance, testing, and commissioning.