Strength comes from within
The future way of building homes has been around for more than 40 years
Masonite Beams is the lightweight I-joist that combines low weight, high strength and long spans. The beam’s I-profile means that less material is used compared with solid structural timber. Maintaining the traditions of northern Sweden, we have developed a building systems for the future from our factory in Rundvik. When you choose Masonite Beams you get quality – strong, lightweight beams.


Masonite Beams are manufactured in Rundvik, northern Sweden. The raw material for the production of our I-joist is certified according to FSC® Chain of Custody and PEFC Chain of Custody. Certified products can be delivered upon request and are labeled in accordance with applicable certification requirements.
Our I-joist design is engineered to use less wood than comparable structural timber beams. The design can help reduce thermal bridging in building assemblies and may contribute to improved energy performance when incorporated into the overall building design. Our management system is certified according to ISO 9001 and ISO 14001, demonstrating our commitment to quality management and continuous environmental improvement.
Byggma Group, with a revenue of EUR 190 million in 2023 and 690 employees, is a leading force in sustainable construction. Our brands, including Masonite Beams, Huntonit, Forestia, Smartpanel, Aneta Lightning and Uldal drive innovation with cutting-edge products and technologies. From pioneering the first 8-story building with I-joists to setting new building standards, Byggma Group is committed to excellence.
Go to Byggma websiteWith our I-joists available in depths between 195mm & 500mm, explore our full stock in the product range section on our site. Masonite Beams’ offer products to suit every project, from extensions to new build detached houses, from low level apartment blocks to high-rise buildings. We offer you several ways to reduce your costs. The light weight makes them easy to handle, increasing the project’s efficiency. A construction worker, for example, can carry our products, which means that many work processes can be performed without the need for a crane. Access all of our documents and guides by clicking the button below.