All buildings face one great enemy: Weather. Moisture erodes your building's skin, letting destructive elements in, and causes its skeleton to rust. Extreme temperature variances force expansion and contraction of masonry causing cracks and shifts. Driving rain ages decorative limestone elements. Sealant hardens when losing flexibility over time causing it to crack or peel away from the joint - the common promoter of water infiltration. Founded in 1979, Reliable Building Systems is a leading Chicago-area building restoration and maintenance contractor.