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I wonder about a nylon spacer washer between rail and wall to create a little space and allow air movement. Water that gets back there will not stay and the rail should still be solid enough for the fence. Plus it will be cheaper plus it wont look so messy as all that caulk.


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If the fence is plastic there should be no need to worry about water damaging any of it's pieces. If the rail is removed and there's a chance of water getting through to the house it is a good idea to caulk the top and sides of the rail. Urethane caulk is durable and paintable, but very hard to tool (very sticky). 100% silicone is the most water proof, but ...


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