Wood Production: Manufacturing & Kiln Drying

Every piece of wood furniture and every wood structure starts as a tree. This article walks through how lumber mills turn trees into lumber, with a focus on why moisture content matters to the quality of the final product.

• The Lumber Manufacturing Process Generally Follows These Steps
• Kiln Drying Wood for Maximum Value and Usability
• Environmental Impact & Sustainability in Wood Production

Lumber mills turn trees into manufactured wood products. Throughout the process, the moisture content (MC) of the wood is an important factor for producer and end user alike.

The Lumber Manufacturing Process Generally Follows These Steps

1. Head Rig: The primary saw cuts the tree into sawn pieces or boards.
2. Edging: Removes irregular edges and defects from sawn pieces or boards.
3. Trimming: The trimmer squares off the ends of lumber into uniform pieces.
4. Rough Lumber Sorting: Pieces are separated based on dimension and final product production, whether the finished piece will be unseasoned (known as “green”) or dry.
5. Stickering: Lumber destined for kiln drying production is stacked with spacers (known as stickers) that allow air to circulate within the stack (green product skips this stage and the next).
6. Drying: Kiln drying wood speeds up the natural evaporation of the wood’s MC in a controlled environment.
7. Planing: Smoothes the wood’s surfaces and ensures that each piece has a uniform width and thickness.
8. Grading: Assigns a grade to each piece of lumber that indicates its quality, based on a variety of characteristics. Softwood lumber grade stamps also carry a moisture designation, such as S-DRY or KD.

Kiln Drying Wood for Maximum Value and Usability

To maximize wood’s value and strength, mills invest time and money in kiln drying to remove excess moisture from the lumber.

Kiln drying some hardwood species can take a month or more, depending on the wood’s initial MC.

Properly dried wood has many advantages over green wood for both producers and consumers. It reduces waste in manufacturing and extends the service life and usefulness of wood products, giving the consumer a stable product that will last for years.

The kiln drying process can vary considerably, depending on the species and initial MC of the wood. In general, however, these are the steps in the process:

1. Lumber producers carefully stack “green” wood, using spacers called stickers to create gaps so air can circulate throughout the stack.
2. Once the wood is in the kiln, it’s heated to temperatures that depend on the species, typically about 110°F to 180°F in conventional kilns and about 230°F to 280°F in high-temperature kilns.
3. Operators constantly monitor kiln temperatures and relative humidity (RH), as well as the lumber’s MC. The goal is to dry the lumber to the correct MC for how it will be used.

The profitability of lumber manufacturing depends on the mill’s ability to maximize the wood’s quality throughout the entire lumber manufacturing process.

If the wood in a mill’s production line is too wet or too dry, the finished product may receive a lower grade and will have a lower dollar value than a piece that has been properly kiln dried.

After drying, in-line moisture measurement systems can identify and mark pieces that are too wet or too dry.

Those pieces can be pulled from the line before further processing and re-dried or re-milled as needed to get the highest grade possible from each piece, which increases the mill’s profits and gives consumers better materials.

Many consumers and builders believe concerns about lumber MC end when the wood leaves the mill. In fact, wood products should be measured and monitored after that, too. Wood keeps gaining or losing moisture until it reaches its equilibrium moisture content (EMC) with its surroundings, so its MC needs to be right for where it will be used.

Environmental Impact & Sustainability in Wood Production

People are increasingly conscious of the environmental footprint we leave behind, and the wood products industry has been shifting its approach to sustainability. Here are three examples:

1. The Importance of Sustainable Forestry

Sustainable forestry refers to managing forests to ensure that they continue to provide the timber resources we need and other ecosystem services, such as clean water, wildlife habitat, and carbon sequestration.

It aims to balance our current needs with those of future generations.

Key principles include:

• Selective Logging: Only certain trees are harvested, allowing younger trees to mature and the forest to regenerate.
• Reforestation: After logging, new trees are planted or naturally regenerated to replace those cut down.
• Biodiversity Conservation: Sustainable forestry practices prioritize the conservation of native species and habitats, ensuring that the forest ecosystem remains healthy and diverse.

2. Modern Mills Reducing Carbon Footprint

Like any industry, wood products manufacturing uses energy and produces emissions, and many modern mills are adopting practices to reduce their carbon footprint.

• Energy Efficiency: Many mills are investing in energy-efficient machinery, reducing their electricity usage.
• Waste Reduction: Sawdust and offcuts, once seen as waste, are now being used to produce biofuels and other products, ensuring fewer materials end up in landfills.
• Carbon Storage: Well-managed forests keep storing carbon as they regrow, and wood products continue to store carbon throughout their service life.

3. Benefits of Using Reclaimed Wood in Production

Reclaimed wood, salvaged from old buildings, barns, and other structures, is gaining popularity in modern construction and furniture making due to its aesthetic appeal and environmental benefits.

• Waste Reduction: By reusing timber from old structures, we reduce the demand for new wood and prevent valuable materials from ending up in landfills.
• Character and History: Reclaimed wood often has a rich history, unique textures, and patterns that new wood doesn’t offer. This makes it a popular choice for crafting unique, high-quality furniture pieces.
• Energy Conservation: Producing new lumber involves harvesting, transporting, processing, and drying, all of which use energy. Reclaimed wood skips many of those steps.

Wagner Meters has made moisture measurement products for the wood products industry since 1965, with solutions for lumber producers, secondary wood products manufacturers, and installers of wood products.

Shop Industrial Wood Moisture Meters

Further Reading:

Wood Production Part II: Manufacturing

Free Download – How to Choose the Right Industrial Hand-held Moisture Meter for Your Mill

Learn more about kiln drying your own wood and why moisture readings matter.

Ron Smith

As Sales Manager for Wagner Meters, Ron has more than 35 years of experience with instrumentation and measurement systems in different industries.  In previous positions, he has served as Regional Sales Manager, Product and Projects Manager, and Sales Manager for manufacturers involved in measurement instrumentation.

Last updated on October 9th, 2026