Rot is a fence's worst enemy and typically attacks bottom-rail joints first. If you catch decay early, you can saturate the damaged spot with a preservative, then mend it as shown below. If the rail has broken away, you'll have to replace it. Use treated lumber for your repairs.
To minimize rot around fences, make sure posts are set in concrete and cut back surrounding vegetation. Plants often keep areas moist and thereby contribute to the effects of moisture on wood.
Time: 30 to 60 minutes to fix a rail; additional time for painting.
Skills: Basic carpentry skills.
Tools: Hammer, nail set, caulking gun, screwdriver, chisel, saw.
Using T-braces
Chisel out rotted material. Secure rails to posts with steel T-braces, drilling pilot holes for screws.
Shoring with 2x4s
Alternatively, shore up rails with short 2x4s butted tightly against the rail and fastened to post with galvanized nails.
Sealing to Prevent Problems
At the rail/post joint, apply butyl caulk, which will remain flexible to deter rot. Paint the brace to match the fence.
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