Feature Trusses

These are the traditional green oak or seasoned oak trusses you commonly see in vaulted ceilings, barns, great halls, and high-end homes. Oak trusses follow the same structural principles as standard timber trusses, but they’re often exposed and used as architectural features. Because oak is strong, trusses can include decorative curves and heavier sections.

Background Oak buildings typically consist of two eaves beams (wall plates) which are held together with tie beams. These tie beams hold the eaves beams in place with curved braces that connect the tie beam to the post with pegged, mortice & tenon joints to stop the roof load on the rafters pushing the eaves beams apart. These tie beams are often a straight beam spanning the building but they can be enhanced by using principal rafters (enlarged rafters) above the tie beams with collars & posts to form feature trusses. There are many different styles of truss, some are designed to increase the possible span such as a hammer beam truss that can often be seen in cathedral roofs. 1. King Post Truss Description: One of the simplest and oldest truss designs, the king post truss features a central vertical post (king post) connecting the ridge to the base of the truss. Components: Two principal rafters, a king post, and a tie beam. Uses: Ideal for shorter spans (up to 8 meters) and commonly found in traditional homes, barns, and small structures. Aesthetic Appeal: Offers a clean and straightforward look, often exposing the woodwork in the centre of a room. 2. Queen Post Truss Description: A variation of the king post truss but with two vertical posts (queen posts) instead of one. Components: Two principal rafters, two queen posts, a tie beam, and straining beams. Uses: Suitable for slightly longer spans (up to 10 meters), often used in larger rooms or barns. Aesthetic Appeal: Creates an open feel while still providing strong support. The two posts offer an attractive symmetrical design. 3. Raised Tie Truss Description: In this design, the tie beam is positioned higher up than in a typical king or queen post truss, resulting in a more open and spacious interior. Components: Principal rafters, a tie beam that is raised from the bottom, and supporting struts. Uses: Ideal for creating open-plan interiors with vaulted ceilings while still providing structural support. Aesthetic Appeal: Perfect for rooms where height and openness are desired, often seen in modern oak- framed homes. 4. Collar Tie Truss Description: This truss features a horizontal collar (collar tie) that connects two rafters partway up, providing reinforcement without a full tie beam at the base. Components: Principal rafters and a collar tie. Uses: Suitable for medium spans, typically used when less structural height is required but added strength is still needed. Aesthetic Appeal: Provides a slightly lower profile than king or queen post trusses, giving a more compact appearance while still showcasing the oak beams. 5. Hammer Beam Truss Description: One of the most elaborate and decorative truss designs, featuring short horizontal beams (hammer beams) that project from the walls and support the roof without the need for a full tie beam across the width. Components: Hammer beams, curved braces, and principal rafters. Uses: Suitable for long spans (often found in large halls, barns, churches, swimming pools and cathedrals), allowing for wide open spaces with minimal vertical obstructions. Aesthetic Appeal: Highly decorative, often used in grand, historic buildings. The hammer beam truss showcases intricate woodwork and creates a dramatic, vaulted ceiling. 6. Scissor Truss Description: A unique truss where two beams (rafters) cross each other, resembling scissors, creating an arched ceiling. Components: Two rafters that intersect in the middle, forming a vaulted interior. Uses: Ideal for creating large, open spaces with a vaulted roof without the need for tie beams. Aesthetic Appeal: Offers a striking and elegant look, making it popular in modern oak-framed buildings with high ceilings. 7. Tie Beam Truss Description: This truss features a horizontal tie beam at the base of the truss, connecting the two rafters and providing strong structural support. Components: Principal rafters and a horizontal tie beam. Uses: Commonly used for shorter spans where heavy loads need to be supported, such as in smaller homes or outbuildings. Aesthetic Appeal: A simple yet sturdy design, often exposed to showcase the oak beams in traditional timber-framed homes. 8. Arched Brace Truss Description: This truss includes arched braces that add both structural strength and aesthetic elegance. Components: Principal rafters, arched braces, and a tie beam. Uses: Often used in buildings where both strength and decorative appeal are important, particularly in long spans. Aesthetic Appeal: The arched braces create a sweeping curve, adding a sense of grace and grandeur to the interior space. 9. Cambered Tie Beam Truss Description: This truss has a curved tie beam, which is slightly arched rather than straight, offering a more dynamic look. Components: Principal rafters, a cambered (curved) tie beam, and sometimes struts or braces. Uses: Suitable for both medium and long spans, often used in barns and traditional buildings. Aesthetic Appeal: The curved tie beam adds visual interest while still providing strong support, blending functionality with style. 10. Cruck Frame Truss Description: A rare and ancient truss design where the trusses are made from curved timber that extends from the ground to the roof ridge. Components: Two large curved timbers (crucks) that meet at the ridge, with additional supports. Uses: Historically used in medieval homes and barns, often found in period restorations or buildings seeking an ancient, organic appearance. Aesthetic Appeal: Offers a rustic, old-world charm, with the naturally curved oak beams providing a unique and dramatic visual effect. Key Considerations for Choosing Oak Trusses

Span and Load:

The type of truss you choose will depend largely on the span of the roof and the loads it needs to support (both live and dead loads). Some trusses are better suited for long spans, while others are ideal for shorter spans.

Aesthetic Goals:

Oak trusses can dramatically affect the look and feel of a space. Consider whether you want a simple, rustic look or a more elaborate, decorative design.

Cost and Complexity:

More complex truss designs, like hammer beam or arched brace trusses, tend to be more expensive and require skilled craftsmanship. Simpler designs like king post or tie beam trusses may be more cost-effective. Oak trusses are prized for both their structural capabilities and their ability to add beauty and character to a building. Each design offers its own advantages and aesthetic qualities, making oak trusses a versatile choice for both traditional and modern architecture.

Oak Framing in Modern Architecture

In contemporary architecture, oak framing is valued not only for its historical connection but also for its environmental sustainability and aesthetic beauty. It can be used to create homes that have the character of an old-world cottage or barn, while incorporating modern comforts and designs like open-plan living spaces, floor-to-ceiling glass windows, and energy-efficient materials. Oak framing bridges the gap between traditional craftsmanship and modern living, creating buildings that are not only structurally sound but also full of natural beauty and timeless appeal.