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Firewood is ready to burn most efficiently when its moisture content is 15–20%. In practice, aim for below 20%; if a piece measures higher, dry it longer when possible. Measure the freshly split interior, not just the outside, which can be drier than the core.
What moisture percentage should firewood be?
The U.S. Environmental Protection Agency (EPA) says wood burns most efficiently at 15–20% moisture content and burns best below 20%. A reading under 20% is therefore a useful practical threshold; 15–20% is the target range.
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A seller’s “seasoned” label or a dry-looking surface cannot establish the moisture level inside a log. A meter reading taken on a freshly split face gives a more useful check.
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How to test firewood with a moisture meter
- Split a log. Expose a fresh face through the center; the outside may have dried while the core remains damp.
- Test the fresh face shortly after splitting. Follow the meter’s instructions, inserting its probes into the grain rather than relying on the outer bark or surface.
- Check more than one spot. If possible, take readings in two or three places on the exposed face. Use the meter’s instructions to interpret the results.
- Compare the reading with the target. Wood above 20% needs more drying if you can wait; a reading below 20% meets the practical ready-to-burn threshold.
The EPA’s 2020 Burn Wise guidance described basic wood moisture meters as commonly available online or at hardware stores, with a typical price of about $15–$40 at that time. The price is a dated reference, not a current quote.
#1 Best Overall
General Tools MMD4E Moisture Meter for Wood, Walls & Water Leak Detection | Pinless wood moisture meter for drywall & walls. Detects mold & humidity. Water leak detector for home moisture testing.
- HUMIDITY SENSOR: Our handy meter tool can quickly determine what level of remediation is needed to keep your family safe from black mold. High levels of dampness that go untreated are the leading cause of harmful fungus growth in the home.
- WATER LEAK DETECTOR: Finding the moisture content in your wood or drywall is the first step in early prevention. Continuously check and test suspicious water stains around the house so you can determine whether the area is wet or has already dried. Low, medium and high moisture tones and on-screen icons, Reading HOLD button
- MOISTURE READER: The mold test features large 0.3" high digits in a backlit LCD for quick and easy detecting. Our mildew scanner includes extra 8mm stainless steel pins, a protective cap that doubles as a calibration checker, and a “9V” battery.
- MOLD TESTER: For an accurate test read, stick the stainless steel pins into the surface of what you're measuring. The gauge has a broad range of 5 - 50% for wood and 1.5 - 33% for building materials such as concrete and drywall.
- GENERAL TOOLS: We're a recognized leader in designing and developing specialized precision tools dedicated to delivering exceptional customer service. We encourage artisans and DIYers to work smarter, measure better, and repair more productively.
Why wet firewood burns poorly
Water in the wood uses heat as it evaporates, leaving less heat for combustion. The EPA summarizes the consequences: wet wood produces less heat and more smoke and creosote. That means a cooler, less efficient fire, wasted fuel and increased chimney-fire risk from creosote buildup.
How long should firewood season?
Drying time depends on the wood and storage conditions, so time alone cannot confirm that a particular log is ready. EPA guidance gives at least six months as a general minimum; its consumer guidance gives different approximate periods for softwood and hardwood:
Rank #2
RDINSCOS Replaceable Pins Moisture Meter | Check the Dampness Level on Firewood/Drywall Walls, Wood and Floor
- FIND HIDDEN WALL MOISTURE EARLY — Check suspicious drywall and building surfaces after a leak, water stain, or other moisture concern. Detect abnormal moisture before a small issue develops into more extensive damage and costly repairs
- CHECK BEFORE YOU REPAIR — Don't rely on a wall looking or feeling dry. Use the moisture meter to check questionable areas before painting, repairing, or covering the surface, helping you make decisions based on actual moisture readings.
- CHECK FIREWOOD BEFORE YOU BURN — Test firewood before placing it in your fireplace or wood stove. Knowing the moisture level of your firewood helps you choose wood that is ready for burning and avoid relying on appearance alone.
- PIN-TYPE TESTING FOR DIRECT MEASUREMENTS — The contact pins penetrate the material to measure moisture inside wood and building materials. This makes it useful for checking areas where surface conditions may not tell the whole story.
- ONE TOOL FOR TWO IMPORTANT HOME CHECKS — Keep it ready for two practical jobs: checking walls for hidden moisture and checking firewood before burning. A simple way to make informed decisions before a moisture problem becomes expensive or wood goes into the fireplace.
| Wood type or guidance | EPA drying guidance |
|---|---|
| General minimum | At least six months (EPA best-practices guidance) |
| Softwood | About six months (EPA consumer guidance) |
| Hardwood | About 12 months (EPA consumer guidance) |
These are seasoning guidelines, not guarantees of a specific moisture reading. Check the wood with a meter when possible, especially if the pile’s drying conditions or history are uncertain.
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How to stack and store wood for drying
- Split it before stacking. Split pieces dry faster than whole rounds.
- Keep the stack outdoors and off the ground. Raising it helps keep the wood from sitting directly on damp ground.
- Cover only the top. Leave the sides open so air can move through the stack; wrapping the sides can trap moisture.
What else to consider before burning
When comparing firewood, look beyond a “seasoned” claim: consider the measured moisture percentage, whether the reading came from a freshly split face, the wood species and drying time, and whether the stack had airflow with only its top covered.
Rank #3
Klein Tools ET140 Pinless Moisture Meter, Detects up to 3/4-Inch Deep | For Non-Destructive Moisture Detection in Drywall, Wood, and Masonry
- WATER LEAK DETECTOR detects relative moisture content from leaks and flooding
- PINLESS MOISTURE METER measures relative moisture content in building materials
- NONDESRUCTIVE DETECTION up to 3/4-Inch deep using Electromagnetic field (EMF) technology
- USE ON DRYWALL, MASONRY, HARDWOOD, AND SOFTWOOD; calibrated for these materials only
- REVERSE-CONTRAST DISPLAY for easy viewing of reading and nine LED bars to indicate moisture range
The EPA recommends buying and burning locally cut firewood to reduce the risk of transporting invasive forest pests. Do not burn wet or green wood, and follow the rules for your location and appliance, including local air-quality requirements.
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Bestseller No. 2
Bestseller No. 3
Best Value
Wood Moisture Meter, TopTes Digital Moisture Meter TS-630, Handheld Humidity Tester with 2.25-inch LCD Display, Tricolor Backlight, Check The Dampness Level on Firewood/Drywall - Orange
- Easy to Read with Large LCD Screen: This wood moisture meter is easy to get an accurate reading from the surface of materials and displays accurate moisture readings on the 2.25" big screen. Use this handheld meter to check the moisture content in firewood or drywall, it can stand up on the table, the moisture content is displayed with a bar graph and percentage (_%RH) on the screen. Date Hold and Max/Min function is used to freezes readings, useful for writing down data
- Tricolor Backlight Display, Easy to Use: TopTes Moisture Meter TS-630 features an HD tri-color backlight to easily know if the wood/wall humidity is Dry, Moist, or Wet. Green backlight for Low moisture, orange backlight for middle moisture, and red moisture for high moisture. After selecting the mode, and putting pins into the firewood, easy and quick to get a visible alert from the clear screen
- Seven Calibration Scales, Two Material Mode: It is designed with built-in characteristic parameters of 7 calibration scales for wood and building material, ranging from 0.0% to 57%. This humidity meter is perfect for woodworking, water damage restoration, building construction, and home renovation. Easily Check and test suspicious water leaks around the wall/floor so you can quickly determine what level of remediation is needed
- Pin Type & Battery Operated: TopTes TS-630 moisture meter is a pin-type moisture meter and operates on batteries. With a high precision multi-material sensor, DON’T need calibration. It’ll support an accurate reading after inserting the stainless steel pins into the surface of the wood or building materials. It will auto shut off after 10 minutes of non-use to help save energy. A low-battery indicator will appear on the screen when the battery is running out
- What's in the Box: One TS-630 Moisture Meter, three AAA Batteries, one User Manual, one Carry Pouch, one Pair of Test Pins, one Mini Wrench
Rank #4
Wood moisture meters and water leak detectors are suitable for the rapid determination of moisture content in various materials such as logs, paper, plywood, plaster walls, and flooring materials.
- 🌲【Accurate and fast measurements reveal hidden water leaks】: It has 2 high-precision pins that can penetrate the surface to be tested and quickly measure moisture content to estimate potential moisture increase throughout the home. COCZOW moisture meter is the ideal tool for measuring moisture.
- 🌲【Professional Wood Moisture Meter】: 6 calibrated scales. Our moisture meter is a great tool for manufacturers, floorers, inspectors and wood suppliers to quickly and easily measure moisture content (% Mc). You can quickly determine if the moisture content is low (5-12%), medium (12-17%) or high (17-60%). Checking moisture content prevents wood from cracking and warping.
- 🌲【Widely Used】: PM6811A moisture meter is ideal for carpentry, building construction, agricultural restoration and floor laying. Measure moisture content of wood products such as hardwood floors, cabinets, furniture, lumber, lath, beams, plywood, panels, composite boards, window frames, forestry wood, coils, building materials, etc.
- 🌲【User-friendly】: With LCD backlight, the backlight color is divided into three types of green, yellow and red, or display the moisture content of different measurement types. Hold function, maximum/minimum moisture measurement function and 5-minute automatic shutdown function (no power supply required).
- 🌲【Why choose COCZOW Wood Moisture Meter】: LED display function, large measuring range (wood: 2.0%-75.0%. Building materials: 1.5-30%), durable stainless steel needle, heat insulation, light weight and easy to carry. Get professional and accurate results with Peakmeter Wood Moisture Tester.
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