Moisture Meters Essential to Contractor Toolkit for Construction Disaster Recovery

For construction contractors involved with restoration after any disaster where water intrusion plays a role, such as a hurricane or fire (due to suppression efforts), moisture meters are necessary to assess the extent of the water damage quickly and efficiently. This is vital to distinguish between salvageable and unsalvageable materials in order to cost-effectively expedite needed construction. 

Whether in roofing, drywall, framing, flooring, or carpet, excess water left behind in building materials after a disaster can lead to mold growth and material rot long after the initial incident. The ability to provide sufficient documentation to prove existing water damage can also be stipulated for insurance claims, FEMA registration, and even as a requisite to contracting as a disaster recovery professional.

Although the construction industry has access to moisture meters, to some extent, these tools typically require calibration, sampling and specialized personnel. In addition, they are not very portable or flexible in measuring a variety of materials.

Instant, non-destructive moisture measurement of concrete, mortar, drywall, gypsum boards. The HI5202 is Kett’s latest advanced system. Handheld and battery powered, it provides accurate measurement to 4″ deep depending on the application.

Fortunately, a new category of portable, handheld, instant moisture measurement devices are now available for construction contractors that can be used on a wide range of materials with no special trainingThese “point-and-measure” units can be used at the disaster recovery jobsite wherever moisture is a problem. These new tools are now helping to speed restoration and improve building quality and can be either purchased or leased. 

So, today the typical disaster recovery contractor’s toolkit needs an update. For initial assessment and throughout the rebuild process, contractors doing remediation work where water intrusion is a problem will need a reliable, portable, instant moisture meter, along with shop vacs, fans, and other equipment to dry and remove water.

“Since not all water damage is visible to the naked eye, using a moisture meter can help contactors determine exactly just how much of a structure has been exposed to water, so they can save what is dry and safe, and rebuild only what is necessary,” says John Bogart. Bogart, an expert in moisture and composition analysis, is also Managing Director of Kett US, a manufacturer of a full range of moisture and organic composition analyzers. 


A powerful, slow-moving hurricane can dump up to two feet of rain in a short time. A category 4 hurricane can reach wind speeds up to 155 mph with storm surge up to 18 feet, according to the Saffir-Simpson Hurricane Scale. This can cause serious damage and require substantial repairs to homes as well as commercial and industrial facilities.

Check the Roof

Whether the damage is visible or not, a hurricane may have loosened shingles enough to allow water to creep in and rot the structure of a structure from the top down. A contractor’s visual inspection of the roof can quickly assess any preliminary damage. But as contractors make necessary repairs after a major storm, they will also want to quickly discover any moisture seeping in before it causes too much damage.

“A contractor can use a moisture meter to learn whether or not water is working its way through a roof that has been compromised by gale-force winds and heavy rain,” says Bogart.

Kett HM530 Wood Moisture Meter – Instant, non-destructive

Roofs are especially susceptible to wind damage from a hurricane at the corners, perimeters, and joints. A thorough investigation of these areas, along with the areas surrounding any loose or damaged shingles, are all great places to begin locating damage that can allow water to seep in.

For example, one portable moisture meter that contractors have found to be effective to instantly check a roof for water damage is Kett’s HI520-02, which can measure through shingles and deep into the sublayers to evaluate roof sheathing for moisture. The versatile unit also measures drywall, concrete, and mortar.

Inspect Drywall, Frame, and Insulation

If a structure was exposed to serious amounts of water, chances are, much of the affected framework behind walls will need to be replaced, as will any drywall and insulation that has contacted the water. Drywall and insulation will need to be removed and replaced well above any visible watermarks left after the flooding or standing water subsides. Exposure to water will weaken drywall and cause swelling, bulging, and crumbling, while insulation may quickly become a host to dangerous mold.

Drywall may seem fine at first glance, but the contractor will want to use a moisture meter to ensure that the structure’s walls are free from moisture damage. Contractors can rely on a universal moisture meter or even a near-infrared moisture meter to provide reliably accurate moisture readings throughout a structure.

According to Bogart, Near-Infrared (NIR) light is a highly accurate, non-contact secondary measurement method that can deliver immediate, laboratory quality moisture readings.

“NIR moisture meters follow the principle that water absorbs certain wavelengths of light. The meter reflects light off the sample, measures how much light has been absorbed, and the result is automatically converted into a moisture content reading. Contractors can use the NIR meters on anything where measuring surface moisture is important,” says Bogart.

Major Structural Damage

If powerful winds, downed trees, or major flooding have caused extensive structural issues, chances are the home or facility has been exposed to a significant amount of water from rain, flash floods, or storm surge.

These new tools are now helping to speed restoration and improve building quality.

When structures are ripped open or flooded, it is important to discover the extent of the damage: Just how far did the water creep into the structure? Is only one area of the structure affected? What needs to be replaced?

If the building has incurred major structural damage, the best way to discover what is salvageable is to check what is dry and intact. A moisture meter will provide many of these answers.


Extinguishing a fire can require using large volumes of water which can prove to be just as destructive to a structure as the fire itself. So, on first inspection it can be helpful for a restoration contractor to use a universal moisture meter or a NIR meter to determine the extent of water damage in plain view and behind the scenes.

Is the base floor too water damaged to salvage? Wood that has been exposed to water and flooding can be susceptible to dry rot. So, using a wood moisture tester to check that wood has properly dried can prevent losing structural integrity as a result of dry rot. Be sure to check carefully around window and door frames for moisture too, where powerful winds can shift joints, and water can find its way in.

While initial assessment may be the primary focus of moisture measurement for disaster recovery, it can also be invaluable during the rebuild process as well.

“A moisture meter is good to use not only for assessment but also throughout the entire rebuilding process as well since it helps contractors monitor moisture levels along the way to document building quality and compliance,” concludes Bogart.

This material appears in the April 2022 issues of the ACP Magazines:

California Builder & EngineerConstructionConstruction DigestConstruction NewsConstructioneerDixie ContractorMichigan Contractor & BuilderMidwest ContractorNew England ConstructionPacific Builder & EngineerRocky Mountain ConstructionTexas ContractorWestern Builder