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Old 11-21-2011, 07:54 PM   #1
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Deck framing for mitered deck planks corners


I will run a 2-plank-wide picture-frame type perimeter around my deck and will miter cut (at 45 degrees) the deck planks in each corner. What does the framing underneath look like where I will have the 4 planks (2 from "east-west" and 2 from "north-south") where they meet at the 45 degree angle? I know I have to have something underneath the mitered planks to fasten the deck planks.

I can picture the need for blocking to support the "picture frame" perimeter where the framing underneath wasn't running perpendicular but I can't picture this corner issue.

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Old 11-21-2011, 08:48 PM   #2
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Deck framing for mitered deck planks corners


for the framing of the mitred corners.. i install blocking on its flat to support the boards. for the transition from the bread board to the regular boards you will need to add a joist on each end so the bread board edge is supported and the normal boards have something to fasten to

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Old 11-21-2011, 08:54 PM   #3
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Deck framing for mitered deck planks corners


Something like this, if I understand you correctly.

Andy.
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Old 11-22-2011, 04:59 PM   #4
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Deck framing for mitered deck planks corners


same theory, i put my blocking in on the flat so there is more to fasten to though. for the double bread board on the end of the deck your 1st joist in should be 10" in from the outside edge of the end joist.. this allows for a 1" overhang of the 1st bread board and give s fastening base for the inner one along with the normal deck boards... this is if your using 1x6 decking
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Old 11-22-2011, 05:02 PM   #5
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Deck framing for mitered deck planks corners


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Originally Posted by woodworkbykirk View Post
same theory, i put my blocking in on the flat so there is more to fasten to though. for the double bread board on the end of the deck your 1st joist in should be 10" in from the outside edge of the end joist.. this allows for a 1" overhang of the 1st bread board and give s fastening base for the inner one along with the normal deck boards... this is if your using 1x6 decking

I like that idea a lot.

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Old 11-24-2011, 11:14 AM   #6
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Deck framing for mitered deck planks corners


This picture does describe the situation. Thanks Andy.
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Old 11-24-2011, 11:31 AM   #7
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Deck framing for mitered deck planks corners


Thanks Kirk. This is good too. Fortunately, before committing on the joist placement moving inward, I did see the need to have some framing to fasten the edge of the inner perimeter plank and the field planks that begin on the inside of the those perimeter planks.

Yes, my decking (timbertech evolutions) is a nominal 1x6 plank.
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Old 11-24-2011, 04:30 PM   #8
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Deck framing for mitered deck planks corners


ok yah so your 1st joist in from the outside one should be located 10" in from teh outside edge of the deck,, from that joist 10" in start you 16 o.c layout. so to reduce the amount of cut deck boards
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Old 12-08-2011, 12:37 PM   #9
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Deck framing for mitered deck planks corners


Good suggestions. Any comments as to how to keep the mitre joints from opening up due to shrinkage?
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Old 12-08-2011, 04:20 PM   #10
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Deck framing for mitered deck planks corners


the wider the plank the more likely the mitre will open up especially if the wood is wet when its installed, its caused by the lumber drying out and shrinking. cross nailing the mitre will help. some use contstruction adhesive but where its exterior the glue will eventually fail
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Old 12-08-2011, 04:28 PM   #11
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Deck framing for mitered deck planks corners


Cut the miter joints 1/8" too long and leave them in the weather, especially warm weather, for a few weeks unfastened. Then come back and cut them to fit. I found that with ipe the inside corner shrank the most, often leaving a 1/8" gap.
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Old 12-08-2011, 04:37 PM   #12
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Deck framing for mitered deck planks corners


This is the way I do benches built the same way you are talking about. A two plank border could be done the same in the corner.

The double advantage of the two piece corner is that you won't have as much of a chance of splitting the edges of the planks when fastening back from the edge... and you won't split the wood beneath because you won't be fastening both corner pieces into the same narrow 2x underneath.

(Of course, you would not need the upright pieces I've shown for the bench drawing.... nor would they have the beveled bottoms like this.)

The bench in these pictures was done this way.
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Last edited by Willie T; 12-08-2011 at 04:44 PM.
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