joist frame around rock
Illustration: Ian Phillps
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Boulder Holder

Accommodating large boulders requires a little more carpentry skill, but a lot less long-term maintenance. The simplest method is to build a joist frame around the rock and lay your decking flush with its edge. This will leave a noticeable gap around the rock. For a snug fit, extend the the decking past the edge of the frame, carefully scribe the rock's outline onto the boards butted against it, and then cut along the line.
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