Lumber

Lumber is wood cut into useful shapes.

People use boards to build house frames. They also use wood for floors and walls.

Most lumber comes from soft trees like pine.

Hard wood is often used for fine furniture. This makes it very strong.

Long ago, a man made a wind mill saw. It made cutting wood much faster. Now, machines cut logs into many sizes. It is amazing how we use trees to build our world.

Lumber is wood cut into useful shapes.

People use these boards to build house frames. They also use them for floors and walls. In the United States, people call cut wood lumber. They call standing trees timber.

In Britain, people use the word timber for both.

Most lumber comes from soft trees. These are called softwoods. Examples include pine, fir, and spruce. About 80% of lumber is softwood. Hardwood is used for things like cabinets. Sawmills turn logs into boards. One common way is using a rip saw. This method is very efficient.

Workers use standard sizes for building. A common size is a 2x4. This name comes from old ways of measuring. Today, the actual size is a bit smaller. This is because wood shrinks as it dries.

Some boards can be very long. One board in Poland was very long in 2002. People use many rules to check wood quality. This keeps buildings safe and strong.

Lumber is wood that has been changed into useful shapes.

People use it to build the frames of houses. It also makes floors, window frames, and wall panels. In the United States and Canada, people call milled boards lumber. They use the word timber for standing or fallen trees.

In Britain and Ireland, people use the word timber for both. This wood is a very important part of building our world.

Making lumber involves several steps to turn a log into a board. One common way is using a rip saw. This method is very efficient for many types of wood. Workers can use plain sawing to cut through a log. They can also use quarter sawing to cut the wood differently. This makes the annual rings of the tree stand in a certain way. Some wood is even re-sawed by splitting a thick board into thinner pieces.

Humans have been processing wood for a very long time.

In 1420, settlers in Madeira cleared large forests to grow crops. They used sawmills to turn those trees into planks for ships. A big change happened in 1593 with a man named Cornelis Corneliszoon. He was a Dutch windmill owner from Uitgeest. He invented the first wind-powered sawmill. This invention made cutting logs thirty times faster than doing it by hand.

Most lumber used today comes from softwoods.

These come from trees like pine, fir, and spruce. In fact, about 80% of all lumber is softwood. Hardwoods are often used for things like cabinets or fine furniture. Builders use dimensional lumber, which comes in standard sizes. A common size is a 2x4 board. In North America, these boards are often between 8 and 12 feet long. Some boards can be even longer, like one in Poland.

It is important that lumber is strong and safe for buildings.

Because wood can have knots or different grains, it varies in strength. To help, groups like the American Lumber Standard Committee set rules. These rules help make sure the wood is the right size and quality. In Canada, the National Lumber Grades Authority maintains similar rules. Even plastic lumber is made now from recycled materials. This helps people find new ways to use wood products.

Lumber is wood that has been processed into uniform and useful sizes.

In the United Kingdom, Australia, and New Zealand, people often call it timber or fine wood. It is used extensively for construction framing and finishing tasks like floors or window frames. In North America, the term lumber specifically refers to milled boards. In the United States and Canada, the word timber describes standing or felled trees. However, in Britain and Ireland, timber is used to describe both the trees and the boards.

To create lumber, logs are transformed through sawing, hewing, or splitting. The most common method is using a rip saw. This method is economical because it allows for the use of lower-quality logs. Plain sawing involves cutting through a log without adjusting its position. This causes the grain to run across the width of the boards. Other methods include quarter sawing and rift sawing. These techniques ensure the annual rings are perpendicular to the sides of the lumber. Some wood undergoes re-sawing, which is the process of splitting a thick board into thinner, full-length pieces.

Lumber is categorized into different types based on its source and finish. Most lumber is softwood, which comes from coniferous species like pine, fir, spruce, cedar, and hemlock. In fact, 80% of all lumber is made from softwood. Hardwoods are also used, though they are more common for high-grade flooring or furniture. Lumber can be supplied as rough-sawn material or surfaced on its faces. Rough lumber serves as the raw material for furniture-making and other shaped items. Finished lumber is supplied in standard sizes for the construction industry. There is also re-manufactured lumber, which is processed for industrial or packaging uses.

Humans have been refining wood processing for centuries. In 1420, settlers in Madeira cleared large forests to grow crops. They used sawmills to process felled trees for shipment to the mainland. A major technological leap occurred in 1593. A Dutch windmill owner named Cornelis Corneliszoon invented the first wind-powered sawmill. This invention was revolutionary for the era. It made converting logs into planks thirty times faster than manual sawing.

Modern construction relies heavily on dimensional lumber. This is lumber cut to standardized widths and depths. Common North American sizes include 2x4, 2x6, and 4x4. In the Americas, these are often called "two-bys." While the names suggest specific measurements, nominal dimensions are actually larger than the actual finished sizes. This is because wood shrinks during drying and is reduced during planing to make it smooth. For example, a modern 2x4 is actually 1.5 inches by 3.5 inches. Historically, a 2x4 was much larger before these standards changed. In 1910, a typical finished board was 1 inch thick, but by 1956, dimensions had been reduced multiple times.

Because wood is a natural product, its quality varies significantly. Factors like knots, grain slope, and shakes affect its strength and value. To manage this, national standards were established to ensure safety. The American Lumber Standard began in 1924 to set specifications for dimensions and moisture content. Today, the American Lumber Standard Committee sets these rules in the United States. In Canada, the National Lumber Grades Authority maintains grading rules. These systems help builders know exactly what kind of strength to expect from their materials.

Lumber technology continues to evolve through new materials and engineering. Some structural lumber is now produced from recycled plastic and new plastic stock. This is known as plastic lumber. When fiberglass is blended into plastic lumber, it increases strength and fire resistance. Some plastic fiberglass lumber can achieve a class 1 flame spread rating of 25 or less. This means it burns more slowly than almost all treated wood lumber. Additionally, engineered wood products are used to provide more flexibility. These are made by binding wood fibers or veneers together with adhesives to create strong composite materials.