Why does the garage take water before the house does?
The garage floor sits at or below the level of the yard, it has a door rather than a wall, and the slab is often the lowest point of the lot. Storm water runs to it before it reaches the house.
A garage door is a flexible seal, and the seal is the part that wears first. Water that pools against the door in a heavy storm can push under the bottom seal and along the threshold. The slab is often sloped toward the door, which means the water collects in front of the opener and the first stored items.
The garage is also the room most likely to be left open during a storm. A door that is raised for a car or a trailer lets the water in directly, and the record notes whether the door was open at the time.
What does the slab and the block wall tell the technician?
The wall base and the slab edge show where the water stood and how far it reached. The readings in those places set the drying, and the wall above the water line is checked for damp that rose from below.
Block walls take water into their mortar joints and release it slowly. A damp band low on the wall after the floor has dried means the block is still holding moisture, and the drying has to continue until that band reads dry. The slab edge is read at the joint where the wall meets the floor, since water runs along that joint.
A framed wall in a shed or a finished garage behaves differently. Its bottom plate and sheathing are read, and the cavity is opened only where the readings stay high.
What is kept and what is removed from a garage?
Hard items can often be cleaned and kept. Porous items that stood in storm water are usually removed, and the list is written for the owner before anything leaves the property.
Cardboard, particle board, paper, insulation and carpet or pad from a finished room are removed. Metal tools, sealed plastic bins, bicycles and most garden equipment can be cleaned and dried. A lawn mower or a generator that stood in water should be checked by the repair shop before it is started again.
The owner decides about anything of value after the list is written. Items that are kept are dried in a clean area and logged, and items that are discarded are photographed first.
How is the garage dried, and when is it closed up?
Drying runs on the readings at the slab, the wall base and the framing. The garage is closed up only when those readings reach their goal, and the door seal is repaired before the next storm.
Air movers are set on the slab and along the wall, and dehumidifiers run in the room. A garage with its door open to the outside dries more slowly in humid weather, so the door is kept closed while the equipment runs and the readings are taken with the door shut.
The owner should have the door seal and the threshold checked before the garage is closed up, since a repaired wall that still lets water in is the same loss waiting to happen.