Who is responsible when water comes from the unit above?
It depends on the cause, the governing documents and the policies involved. The owner of the unit where the water started, the association and each side's insurers may all play a part. Report the leak in writing, document your damage and ask your association which rules and insurance apply before repairs begin.
A condominium association usually has governing documents, and often a master insurance policy, that set out what the association handles and what each unit owner handles. The details vary from building to building, and this page cannot say how yours work. Read the documents or ask the manager.
In the meantime the practical steps are the same. Stop the water if you can, tell the manager or the landlord at once, and photograph the damage before anything is moved. The crew can give you moisture readings and photos for your own claim, and for the claim on the unit above if it is relevant.
If you are a tenant, tell the landlord or the property manager in writing, and ask who authorizes the work. A crew needs a clear approval from the right person before it removes materials.
How do you dry a business without shutting it down for days?
The crew works in phases and in the least disruptive order: extract first, protect equipment and records, then place drying gear where it dries the most with the least noise and traffic. Some work happens after hours. A short closure of the worst-hit area is more common than a shutdown of the whole space.
Drying equipment is loud and takes space. Air movers sit on the floor along walls, and dehumidifiers need a power supply and a place to drain. In a shop or an office that can interfere with customers, so the crew plans placement around the layout and hours.
Protecting what cannot be replaced comes first. Inventory, computers, files and fixtures are moved off wet floors, and valuables should be photographed. Pack-out and storage can be arranged for contents that need it.
Ceiling tiles, carpet tiles and drywall can often be replaced in sections, so part of a store or an office can reopen while another part is still drying. Moisture readings decide when it is safe to close walls and lay new finishes.
Why does water in one unit end up in others?
Water follows gravity and the path of least resistance. It runs through floor penetrations, along pipe chases, down wall cavities and across shared ceilings. In a block-and-concrete building it also spreads sideways along floors. Units that share a wall, a ceiling or a chase can be wet even when no water is visible.
Pipes run through floor slabs and shared walls in condo buildings, and the gaps around them let water travel. A leak on an upper floor can show up as a stain in a bathroom ceiling below, far from the leak itself.
In a single-level plaza or a row of townhomes, shared roofs and party walls do the same thing sideways. A roof drain that overflows can soak the ceilings of several suites, and a roof leak can run along a truss to a different unit than the one under the damaged spot.
That is why moisture mapping goes beyond the visible wet room. The crew checks the walls and the ceilings of every adjoining space it can access, and the association or the neighbors need to allow it.
What about sprinkler and storm water in a commercial building?
Sprinkler discharge is usually clean water at first, but it can pick up dirt and debris and turn into gray water. Storm and flood water are different: surface water is Category 3 and needs separate flood insurance. The category is recorded early because it decides what can be dried and what must be removed.
A discharged sprinkler head soaks ceilings, fixtures and floors in a wide area very fast. The fire protection contractor stops and resets the system, and the crew extracts the water and dries. Do not shut a fire system down yourself.
After a storm, water that comes in through the roof is usually clean when it enters and may get dirty as it travels through insulation and ceiling tile. Water that comes in at ground level from a canal, a river or a surge is Category 3, and the flood damage cleanup page explains how that is handled.
If the building uses fans, A/C or a central system that moves air, ask the crew whether to switch them off, because they can carry contamination or spread humidity.