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Clapboard

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Clapboard is a type of wooden siding used to cover the outer walls of buildings.

Saltbox Concord 2 cropped
Saltbox Concord 2 cropped

It consists of long, thin boards that are often laid in an overlapping pattern. This overlapping design is essential for protecting a structure from the elements. While the term "clapboard" is common in modern American usage, other names exist depending on where you live. In the United Kingdom, Australia, and New Zealand, this material is usually called weatherboard. Other regional names include bevel siding, lap siding, or chamferboard.

Rare Weatherboard Terraces
Rare Weatherboard Terraces

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.

Close-up of original quarter sawn riven oak clapboards in leanto attic
Close-up of original quarter sawn riven oak clapboards in leanto attic

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.

Stained wooden clapboard siding
Stained wooden clapboard siding

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.

Facade detail with natural building materials, Tasmanian House by Jiri Lev
Facade detail with natural building materials, Tasmanian House by Jiri Lev

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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🖼️ Images & Media (8)
File:Close-up of original quarter sawn riven oak clapboards in leanto attic.JPG
Close-up of original quarter sawn riven...
File:Stained wooden clapboard siding.jpg
Stained wooden clapboard siding.jpg
File:Saltbox Concord 2 cropped.jpg
Saltbox Concord 2 cropped.jpg
File:Facade detail with natural building materials, Tasmanian House by Jiri Lev.jpg
Facade detail with natural building...
File:Quaker Hill Historic District - 149 Old Norwich Rd, New London County CT.jpg
Quaker Hill Historic District - 149 Old...
File:Period weatherboard, Dunedin, NZ.jpg
Period weatherboard, Dunedin, NZ.jpg
File:Rare Weatherboard Terraces.jpg
Rare Weatherboard Terraces.jpg
File:Weatherboarded Cottage, Petteridge. - geograph.org.uk - 191922.jpg
Weatherboarded Cottage, Petteridge. -...
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