Finger Joint vs. Scarf Joint

Will a finger joint stand up as well as a scarf joint in exterior marine use?

John Brock: No. It is unlikely that the two joined planks will have identical movement as moisture causes them to shrink and swell. A finger joint concentrates the bulk of this movement difference in the short length of the fingers. A scarf joint will be stronger in this application as the movement is distributed along its longer length.

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