Long wood boards cover a house. 

Long wood boards cover the walls of a house. 

Clapboard is a way to cover the walls of a building. 

Long ago, people split the wood by hand. They made boards with a thin edge and a thick edge. This shape is called a feather edge. Later, mills used saws to make boards. One way is to use a radial saw. This cuts the wood from a log as it turns. This makes a vertical grain. This grain helps the wood stay strong. Another way is flat-sawn. This method was common in the British Isles. However, flat-sawn wood can cup or bend. It also does not hold paint as well.
Many types of wood are used. People use oak, pine, or spruce. Now, many use red cedar. Some wood is left plain. It turns grey as it ages. Other people use paint or stains. You can find clapboard on many buildings. This includes shops, windmills, and small houses.
Clapboard is a type of wooden siding for buildings. 

There are different ways to make these boards.
History tells us where these names come from. 
Many different kinds of wood are used for siding. In North America, people used oak, pine, or spruce. Modern clapboards often use red cedar or pine. Some people leave the wood raw. It turns grey as the tannins wash out. Others use paint or stains to protect it. Traditional colors were black or white. Today, there are many more colors because of chemical pigments. You can find clapboard on cottages, windmills, and shops.
Today, you might see different materials that look like wood. 
Clapboard is a type of wooden siding used to cover the outer walls of buildings. 

The way these boards are shaped depends on how they are cut from a log. Originally, workers used a process called riving. They would split the wood radially by hand to create sections. These pieces often had a "feather-edged" shape, meaning they were thin on one side and thick on the other. To shed water effectively, builders attached them with the thin side up and overlapped the thick side over the thin side.
As technology improved, sawmills began producing boards using different mechanical methods. One method uses a clapboard mill to create radially sawn boards. In this process, cuts are made deep along the full length of the log. The log is rotated until it has turned a full 360 degrees. This specific technique produces a taper and a true vertical grain. These vertical-grain boards are very common in the New England region of the United States. 
Another method is known as flat-sawn cutting. This technique involves cutting the wood tangent to the annual growth rings of the tree. This method was very common in the British Isles. Immigrants carried this specific way of cutting wood to their colonies in Australia and the Americas. However, flat-sawn wood has some disadvantages compared to radial cuts. It tends to cup, or bend, more easily. It also does not hold paint as well as radially sawn wood does.
Different regions have also developed unique styles of joining these boards. In Australia, a variant called chamferboard is used. This version uses tongue-and-groove joints to link the boards together. These joints create a flatter external appearance than standard angled weatherboards. Some modern clapboards are even made of shorter pieces. These pieces are joined together using an adhesive in a process called finger jointing. 
The history of the word "clapboard" is also quite interesting. An older meaning of the term referred to small, split pieces of oak. These pieces were imported from Germany to be used as staves for making barrels. The name itself is actually a partial translation from Middle Dutch. In New Zealand, weatherboard cladding was very dominant in buildings constructed before 1960. Following the major earthquakes of 1855 and 1931, people began to see wooden buildings as less vulnerable to damage. This led to the use of weatherboard walls paired with corrugated iron roofs as a cost-effective building style.
Many types of wood have been used for this purpose throughout history. In North America, builders historically used split oak, pine, or spruce. Today, modern clapboards are frequently made from red cedar or pine. In some traditional settings, the wood was left raw to rely on air circulation. Over time, these boards turn grey as the tannins are washed out of the wood. Most people now choose to paint or tar the wood. While traditional colors were often black or white due to local pigments, modern chemical stains allow for a huge variety of colors.
Today, the concept of clapboard continues through many different materials. While traditional builders used real wood, many newer designs imitate this look using man-made materials. These alternatives include vinyl (uPVC), aluminum, or fiber cement. These materials serve as lightweight alternatives to traditional wooden cladding. You can find clapboard styles on everything from small cottages and shops to large windmills. It remains a fundamental part of traditional building architecture across the globe.
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