A.John Leeke, a preservation consultant from Portland, Maine, responds: To join straight gutter sections, I usually use a miter joint, fastened with screws and adhered with epoxy adhesive formulated especially for wood.

The most effective way to seal butt and miter joints is to form a groove along the joint, inside the gutter, and to fill the groove with a sealant. The groove provides a space for enough sealant to make the joint flexible, allowing for expansion and contraction.

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