How to read and interpret moisture meter findings (a guide for homeowners)

Using a moisture meter for routine maintenance checks and after a flood or moisture event in your home can be useful when you know how to read a moisture meter and interpret the findings correctly.

Moisture meters are best used as screening tools to flag areas that may need closer attention, and it’s best to take multiple readings of the same area over time rather than relying on one reading alone.

Before you rush to the hardware store to buy one, here are a few more important things to know.

Choosing the right kind of moisture meter for your needs 

Pin-style moisture meters

Pin-style moisture meters have two metal prongs that you push into the material you’re testing - like drywall, wood, and so forth. The meter sends an electrical current through each prong and makes a circuit through the material. It’s this electrical connection that estimates the moisture levels.

A pin-style meter is often more intuitive to use, because the depth of measurement is clear. But there’s a drawback to this, too: pin-style meters can only test as far as they can reach.

Be sure to keep in mind what type of material you’re testing before selecting a moisture meter at the hardware store, too, as this type of meter doesn’t work well for testing materials like brick or concrete.

Pinless moisture meters

Unlike pin-style moisture meters, pinless meters use a radio signal to estimate the moisture content inside of the material you’re testing. (One benefit to this is that it doesn’t leave tiny holes in the surface of your test material.)

However, pinless meters are less intuitive when it comes to understanding the depth of your measurement. It’s important to consult your product manual to understand how far your specific meter will penetrate for any given material (drywall, brick, concrete, etc.). 

No matter which style of moisture meter you choose, make sure that it’s calibrated properly and that you’re familiar with its features, limitations, and how it displays data.  

The tools professionals use beyond basic meters

In addition to common moisture meters, water mitigation experts often use thermal imaging to help identify areas where moisture may be present. Temperature differential is a great proxy measure for moisture because water changes how materials like wood and drywall absorb heat. Thermal imaging is especially helpful in larger spaces, enabling mitigators to identify and address problem areas quickly. 

Tools matter, but how those tools are used - and how the results are interpreted altogether - is what makes the difference between useful information and false confidence. At Umpire, we use moisture meters alongside visual inspection, comparison readings, material knowledge, and other tools to understand what’s normal and what isn’t for a specific home.

How to interpret moisture meter readings for your home

When using moisture meters, it’s important to know what healthy moisture levels look like for your environment and the types of materials you’re evaluating. A moisture reading that’s normal in a basement during a humid summer, for example, may be a red flag in a finished living space, or if it stays elevated days after a leak has been addressed.

We recommend that you research the specific materials that you are testing, and use a hygrometer to measure the ambient humidity in your home while you perform moisture testing. It’s generally a good idea to take multiple readings over time to understand what’s normal for your home, especially in areas that you feel may be vulnerable to water intrusion.

When to call a professional

In an environment where temperature and humidity swings are common, Northern Virginia homes can be especially susceptible to higher levels of moisture - especially in enclosed, less-ventilated areas like basements and crawlspaces.

Here’s when you want to consider calling in a professional to assess the moisture levels in your home:

• After leaks or floods
• When readings stay elevated over time
• When results don’t make sense

The bottom line for homeowners

Moisture meters can be helpful tools when it comes to routine home maintenance or water damage follow-ups, but if you plan to use one, it’s important to understand their limits. Moisture meter readings shouldn’t exist in a vacuum, and interpreting findings correctly requires both context and experience. 

Whether you’re trying to assess potential moisture yourself or you want a professional inspection, get in touch. At Umpire, we’re always happy to help - even if it’s just over the phone.