Ceiling & Roof Leak Water Damage Repair in Cliffside Park, NJ

In a multi-family building that is how it works. Supply and drain risers run vertically through the structure, so a break at any point sends water down through the floors below rather than out into the unit where it started. Drying has to cover every unit the water passed through, which means access to several homes at once. Involving the building management immediately is usually faster than negotiating unit by unit.

On a rock lot that is expected. An excavation into diabase has impermeable sides and bottom, and the backfill against the wall is more permeable than the rock around it, so water that gets in cannot drain down and stands against the foundation. A footing drain that actually discharges somewhere is essential in that condition, and many older buildings here do not have one that still works.

Usually yes, and it is the advantage of the site. On sloping ground a gravity drain to daylight is possible, with no pump to fail and nothing to lose power. The constraint is finding a legal and practical route across a dense, built-up ridge to somewhere lower. Where that cannot be arranged, an interior perimeter drain to a sump is the fallback, and it should be on backup power.