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Black Canyon Builders, Building inspiration, Custom Home Builder Durango, Durango contractors, joinery, new home construction, Pagosa Springs, Telluride, timber frame architecture, timber frame joinery

Timber Frame Joinery: A primer on the joints of timber frame construction

If the essence of a timber frame house is the timber, then the joining of the timber is the intrigue. I build timer frame homes for a living and the strength and beauty of the method never ceases to impress me. Since there are no nails and next to no hardware, the placement and accuracy of the joinery are the cornerstones for the integrity of the structure.

Commonly used joints in timber framing are: mortise, tenon, lap and scarf. Architectural aids, such as triangulated braces help to keep the timbers from racking (moving) and add strength.

Mortise/tenon joint: Even if you’ve never picked up a saw or a router, you’re familiar with the mortise and tenon joint. Take a look at nearly any piece of furniture you own. Mortise and tenon joints are the strongest and cleanest choice for joining two pieces of wood at a 90-degree angle.

Interestingly, mortise and tenon joints have been uncovered in archeological sites from around the world, dating back to 2500 B.C. The theory as to why this joint has stood the test of time is that no additional fasteners or glue are needed, if you achieve a good cut. In humid areas, the swelling of the tenon would “lock” even an imperfect cut.

Canyon Builders, custom construction, Pagosa Springs Telluride Durango, CO

Mortise and tenon joint

Lap joint: In its most basic form, a lap joint is two pieces of wood cut to overlap one another. There are different forms of lap joints that offer different strengths, including a half lap, center lap and miter lap. In many applications, a lap joint will require an additional fastener. In the image below, a very simple full lap joint uses just gravity.

Canyon Builders, custom construction, Pagosa Springs Telluride Durango, CO

Lap joint

Canyon Builders, custom construction, Pagosa Springs Telluride Durango, CO

Lap joint detail

Scarf joint: A scarf joint is a joint that aligns two pieces of wood or timbers, while keeping the joint in uniform size with the wood being joined. Scarf joints have a low strength and typically require additional fasteners.

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Scarf joint

With regard to the corner braces and triangulation I mentioned above, timber frame techniques will employ multiple joints in order to create additional strength from the geometry of the timbers. For instance, in the image below, mortise and tenon joints were used to create an angled, corner brace. A triangle is the strongest geometric shape in construction (since most materials prevent the use of full circles).

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Corner brace – mortise and tenon

If you’re working on a smaller project and need help choosing which joint to use, check out this video of a strength test performed by www.finewoodworking.com.

Thanks!

Jared

07 Dec 11
By : jogden
Comments : 1
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  1. whiteoaktools September 6, 2012 at 10:12 pm Reply

    Very great post. I simply stumbled upon your weblog and wanted to mention that I’ve truly loved browsing your blog posts. After all I will be subscribing in your feed and I’m hoping you write again very soon!

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Jared Odgen | About Black Canyon BuildersBased in Durango, Colo., award-winning Black Canyon Builders has designed and built custom homes for all of Southwest Colorado since 2006. Founder and president, Jared Ogden, is a craftsman and general contractor of the highest level - weighing integrity, communication, skill and artistry on equal measure. Learn more about our approach.

Timber Frame Building

Timber frame construction spans centuries and cultures; it is a visual manifestation of the blending of art and engineering. As one of the premier timber frame builders in the Southwest region, Black Canyon Builders has built award-winning timber frame homes. We are an independent builder, and we will work with either our in-house team or your preferred architect to create full or partial timber frame homes.

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