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Offset Mortise and Tenon Joinery

Offset Mortise and Tenon

When you have two beams connecting into one post at the same height, you need to get creative in cutting the joints. The goal here is to make a secure connection without taking too much meat and strength out of the post. In this detail we show you how to accomplish that with an Offset Mortise and Tenon.

Post Top Backcut

Post-Top Detail

This example illustrates a very common assembly in timber framing. That is when a post connects to a tie beam (a horizontal beam, perpendicular to the ridge, that resists the spreading force of the roof onto the walls) or a plate.

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If you are utilizing wooden pegs in your timber frame structure, we recommend close reading of Capacity of Pegged Connections, by Joe Miller, Ph.D. and P.E. Dr. Miller has devoted substantial study to the capacity of wood pegs as they … Tidbits – Capacity of Pegged Connections Read More »

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