Reply by jerryminer

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Posted on Pergola post cap collar?

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960 posts in 1894 days

#1 posted 04-20-2017 06:15 PM

Not sure I understand the question.

If the post wrap is 7 1/2” wide, and you want a 1” overhang on all sides of the cap, then the cap pieces will be 9 1/2” long, no matter what the slope of the cap.

Rather than calculating compound miter angles, I think the easy way to cut the cap would be to shim up one side and cut at 45 on the chop saw.

Be aware that you are creating the potential for moisture to get trapped between post and wrap. The cap miters will likely shrink, gaps may open and allow water to get in. Keep your eye on it and caulk as needed. Weep holes would also be a good idea.

-- Jerry, making sawdust professionally since 1976

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