How to Repair a Wood Fence: Tips and Guidelines - HowStuffWorks
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Step 1: Before you make repair, saturate the damaged areas and a 2x4 liberally with a wood preservative. This keeps the rot from spreading. Step 2: To make a cleat to support the rail, make sure the rail is level, then fit a 2x4 snugly underneath. Nail the 2x4 to the post with galvanized nails. Drive a couple of nails down through the rail into the cleat.
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