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The oak purlins have been air dried for quite some time thus significant lower risk of warping and a lovely, seasoned appearance.
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In timber construction, a purlin or rafter is the term used for the wooden beam in a roof structure that runs along the length of the roof trusses. The purlins span from one truss to another and support the roof. They are also known as beams or rafters. Girders are often sawn out of pine and can have dimensions of 8×15, 8×20, 10×20, or 10×25 cm.
Purlins are typically sawn out of pinewood, but it is also possible to saw them out of oak logs. It is important that the oak rafters are dried before application. Green oak purlins can warp due to the high moisture content in the wood. Therefore, it is recommended to use oak wood that have been air-dried. Air-drying oak rafters reduces the moisture content in the wood over time, resulting in wood with minimal potential for warping. An additional advantage is that the oak wood develops a beautiful appearance through natural seasoning.
The air-dried oak purlins and rafters are suitable for indoor applications.
Our stock of oak rafters originates from France, where the oak forests have been responsibly managed for centuries. Each year, a controlled number of trees are harvested due to the careful stewardship. French oak wood is renowned for its high quality, thanks to the favorable continental climate and soil conditions that provide ideal natural growth conditions for the oak trees.
Our oak rafters are being air dried at our yard, exposed to rain, wind, and sunshine, resulting in a beautiful seasoned surface. Over the course of several years, the rafters develop an appealing patina, adding to their character.
Introducing a visible oak rafter frame imparts a warm and inviting ambiance to any space. The rafters, along with the frames, serve as the foundation for every interior design. Besides seasoned oak rafters, we also offer seasoned oak beams. To learn more about the projects, feel free to explore some examples where the beams have been provided.
Most oak purlins and rafters are used in renovation or construction projects. They are often employed to restore an old barn or to build a new house in a traditional style. When rafters are visible in the interior, they can create a charming atmosphere. An oak rafter frame makes a space cozy and homely, especially in a bedroom.
In addition to their use as structural timber, the wood can also be used for oak steps. A robust oak staircase with treads measuring 20 or 25 cm wide, for example, adds character. An oak staircase is highly durable and resistant to wear and tear, suitable for both rustic and modern interiors. Thanks to the weathered look from the greying process, the staircase has an old, weathered appearance. A substantial rafter can also serve well as an oak stair stringer.
The oak beams (rafters and purlins) can be brushed or planed by us. If a lighter appearance is prefered, planing is recommended. If a more robust and aged look is preferred, we advise brushing the beams. Both brushing and planing can be carried out in our own sawmill.
If the beams are used as structural timber, such as roof rafters, it is uncommon and unnecessary to treat them with oil or varnish. However, if the wood is used for stair treads or stair stringers, applying oil or varnish can achieve the prefered appearance. Tip: first test the oil or varnish on a sample piece. After application, it could be impossible to undo the appearance.
The prices of the air-dried oak purlins and rafters vary depending on several factors. These factors include the choice of different qualities and appearances, as well as the length of the rafters. Longer oak rafters, such as those measuring 5 or 6 meters, tend to be relatively more expensive compared to shorter ones at 3 or 4 meters. Additionally, the price is influenced by the specific processing method chosen. To get an accurate quote, please send us a request for quotation with the specified dimensions and quantities, along with the intended use. Once received, we will assess our inventory and contact you to inform you about the availibility.
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A rule of thumb for structural engineers in timber construction is to add 5 cm in cross-section for every meter of span. According to this rule, an oak rafter of 8×20 cm or 10×20 cm is appropriate for a 4-meter span. For a longer span, such as 5 meters, oak rafters of 10×25 cm are more suitable.
Our stock includes all standard rafter sizes, such as oak rafters measuring 8×15 cm, 8×20 cm, 10×15 cm, 10×20 cm, or 10×25 cm (80×150, 80×200, 100×150, 100×200, 100×250 mm)
The required length of a purlin depends on the distance between the trusses. The spacing between the trusses is typically between 110 and 150 cm, depending on the chosen timber construction by the architect. For larger cross-section oak purlins, such as 10×25 cm, a longer spacing between the trusses is common.
The oak purlins and rafters are available in various lengths from our stock. The most common standard lengths are oak rafters measuring 3 meters, 4 meters, and 5 meters (3000, 4000, and 5000 mm). Longer lengths up to 6 meters are available, but in limited supply.
air dried oak purlins