by Kett U.S.A.

After a disaster involving water intrusion, moisture meters are crucial to assess and document the damage prior to replacement or restoration.

For construction contractors dealing with any disaster where water intrusion plays a role, such as faulty plumbing, water leaks, heavy rainstorms, 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 or possible FEMA registration.

Although the construction industry has access to moisture meters, these tools typically require calibration, sampling, and specialized personnel and they are not very portable.

Moisture Meter
These “point-and-measure” units can be used at the disaster recovery jobsite wherever moisture is a problem. Photo: Courtesy of Kett U.S.A.

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 training. These “point-and-measure” units can be used at the 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. 

Today the typical contractor’s toolkit needs an update. For initial assessment and throughout the rebuild process, contractors involved in 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 contractors determine 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, an expert in moisture and composition analysis. He is also Managing Director of Kett US, a manufacturer of a full range of moisture and organic composition analyzers. 

Faulty Plumbing and other Leaks

The primary cause of most water damage in a structure is faulty plumbing as in burst or leaking pipes. When plumbing problems such as leakage occur within a building’s walls, structural damage can take place out of sight until, eventually, it becomes evident and must be remediated.

 Heavy rain can soak a building’s interior during the construction of a new building or during remodeling whenever the structure is open to the natural environment.

Older home appliances such as washing machines, water heaters, dishwashers, and refrigerators can all leak water into a building’s interior when hoses or connections  weaken or crack.Heating, ventilation, and air conditioning (HVAC) units can also accumulate moisture from the ambient environment and leak.  


A hurricane can loosen shingles enough to allow water to creep in and rot the 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 also need to quickly discover any moisture seeping in before it causes too much damage. 

Some portable moisture meters can instantly check a roof for water damage, measuring through shingles and deep into the sublayers to evaluate roof sheathing for moisture. Some of these  units also measure drywall, concrete, and mortar.


Extinguishing a fire can require 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 an NIR meter to determine the extent of water damage in plain view and behind the scenes.

Moisture Meter
A new category of portable, handheld, instant moisture measurement devices are now available for construction contractors. Photo: Courtesy of Kett U.S.A.

 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.

Inspect Drywall, Frame and Insulation

If a structure was exposed to serious amounts of water, from whatever cause, chances are, much of the affected framework behind walls will need to be replaced, as will any drywall and insulation that has been in contact with 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.

 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. Again, it is important to discover the extent of the damage: Just how far did the water creep into the structure? 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.


 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. RB