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AR15.COM
6/27/2008 12:21:36 PM EDT
I'm finishing up my deck rebuild and I am putting the top cap on the rail.  Southern Indiana is 90+ in the summer and usually a couple of weeks of single digits in the winter.  We get a good amount of rain for the midwest.  I am using KDAT lumber in a 2x6.  I'm really concerned about the miter opening over time.  The butt joint won't open up too badly, but you are going to see end grain.  What says arfcom.
6/27/2008 12:46:53 PM EDT
[#1]
whatever you do on your corners, i would slop the tops of the rails to promote runoff.
6/27/2008 10:13:26 PM EDT
[#2]
I  would miter it and then put a deck screw to hold it all together.

6/28/2008 7:11:02 AM EDT
[#3]
In small section wood the miters tend to not weather well.
In 2x lumber it is not as bad.

In either case you can slow the weathering by dipping all end grain into minwax wood hardener.
It soaks in and blocks the wood fibers preventing water movement into the end grain.

It may not be needed on 2x lumber, but on 1x lumber for railings and trim it really helps.

The stuff is clear and you can still stain (or paint) over it.