The drawing shows a method of caulking exterior trim that will ensure sound performance in all weather conditions. Instead of laying the caulk on at the joint line, I let it into an 1/8-in. back bevel. You can cut the back bevel on the job with a plane or have it done at the mill if it’s a custom molding. This detail is clean, and the cavity created by the back bevel promotes a longer-lasting caulk joint.
Michael van Deckbar, Metairie, LA
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I'd suggest that this is a great idea inside the house, too. I always struggle with making the paint job look right, and stay right over time, when it butts up to caulking. If you used this practice, it would look better, be easier to paint and last longer.
Great information. Caulking is a gap filler and should never be used to cover a tight joint.