Decorative joint for exterior pergola with pressure treated lumber - Woodworking Talk - Woodworkers Forum
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post #1 of 3 Old 08-09-2017, 02:12 PM Thread Starter
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Decorative joint for exterior pergola with pressure treated lumber

Building a deck pergola and need to join two 2" X 12" X 12' to cover a span of 24' with columns to support the span. I don't know what kind of joint to use for this application. The joint will be very conspicuous on the front of the house so I am trying to turn it into a feature. Would a finger or dovetail joint be appropriate for this application? What joint will provide enough movement to not weaken the structure over time? The project is similar to this picture.
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post #2 of 3 Old 08-09-2017, 02:43 PM
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I don't think finger joints or dovetails would be your best choice with two 12' boards. I would probably use a lap joint. If you want to hide the seam you could add a short 3rd board made to look like a key at the top of an arch. This would hide the center seam and could add more strength to the joint.

If you don't have time to do it right the first time, when will you have time to do it over?
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post #3 of 3 Old 08-09-2017, 04:21 PM
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woodworking joints won't work in this case

This is a construction/framing project and woodworking joints aren't usually used for this. In addition, unless one of the cross members is directly over the seam, or centered there's no need for a lot of structure in the joint. A simple 3/4" x 12" X 2 ft block on the back side that won't show will provide all the structure you'll need. :smile3:

The answer to your question will only be as detailed and specific as the question is detailed and specific. Good questions also include a sketch or a photo that illustrates your issue. (:< D)
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