Liquid water versus moisture in materials
A flooded room holds water in two forms. Liquid water sits on the surface and in pools, and it can be removed mechanically with pumps and vacuums at a rate drying equipment cannot match. Bound moisture is the water absorbed into drywall, wood, subfloor and concrete, and that has to evaporate into the air and be carried away. A dehumidifier works on the second kind. Pointing it at a lake accomplishes very little.
A rough comparison helps: a pump can remove a gallon in seconds, while a household dehumidifier may pull out a gallon or two in an entire day under good conditions. Letting bulk water sit and hoping fans will dry it is slower, and it extends the time the building stays wet.
The usual order of work
- First
- Make the space safe, stop the source and remove people and valuables from the wet area.
- Next
- Pump or vacuum standing water, then extract from carpet and flat surfaces.
- Then
- Remove materials that will not dry in place, such as saturated pad or gray-water drywall.
- After that
- Set air movers and dehumidifiers, and open wall cavities if readings call for it.
- Last
- Take moisture readings on a schedule until materials reach their dry standard.
Extraction first versus drying first
Extraction first
- Removes most of the water in hours
- Makes later drying much shorter
- Lets damaged material be spotted early
- Keeps humidity in the house lower
Drying first
- Leaves the bulk water in place
- Keeps drywall and framing wet longer
- Can push moisture into nearby rooms
- Often ends with more material replaced
Colorado air helps, but not enough
Front Range air is dry for most of the year, and homeowners sometimes assume that will rescue a wet basement. It helps during the heating season when indoor air is dry, but a closed basement can hold humidity stubbornly, and a concrete slab loses water slowly regardless of outdoor conditions. In humid summer storm weeks the advantage disappears.
Cold weather brings another wrinkle. A basement kept cool to save energy slows evaporation, so a heating plan may be part of drying. Whoever manages the job should be measuring both air and material moisture, not just running equipment and leaving.
Common questions
How soon should drying equipment start?
As soon as bulk water is out, because materials that stay wet for several days become harder to save.
Can I use my home furnace to dry a basement?
A furnace warms the air but does not remove moisture. Warm, moist air without dehumidification can spread the problem.
General information for Wheat Ridge, not a quote or professional advice. In an emergency, call 911.