Physically, workers must be able to: Stand or walk for long periods; lift and carry materials weighing 50 pounds or more; climb up and down ladders, scaffolds, and other objects and carry tools and equipment; and see (naturally or with correction). Louis and proudly employee‑owned through our ESOP, we are the nation's largest specialty contractor, restoring and protecting building envelopes through expertise in facades, concrete, roofing, and waterproofing.