How To Attach Set Back Double Posts On Corner That is 45 Degrees
You are getting into some complicated framing techniques with this paired posts configuration.
Because these posts are set apart from the corner itself, it is
necessary to add blocking on an angle to tie back into the main joists.
And that connection should also use a custom threaded rod to really
strengthen that joist to blocking point.
You can also have set back 45 degree railing posts. This drawing shows how that would look.
Note that the challenge associated with a 45 degree corner with
paired posts set apart is you will still have the challenge of building
the deck railing section between these two offset posts. The lower and
upper rail members must meet and connect rigidly.
Click Image For Larger View
Required Hardware And Cost
This requires some very precise framing and blocking techniques and
may be beyond the skill of the average homeowner. But a skilled
carpenter should have no problem.
Of course be sure to use all the proper hardware and connectors to
make sure it performs properly. But you will have to notch the decking
around the posts and the railing will sit beyond the edge of the deck
in most cases.
So be sure to keep any gap 4" or less.
But you may wish to consider why you would want to build a corner deck
railing like this given it's complexity and that there are much simpler, cheaper and better looking ways to install a strong long lasting deck railing post..
In addition, a lot of people are concerned about their posts remaining vulnerable to moisture over the years because of direct wood on wood contact.
If you have these concerns, there are railing solutions for decks available to get you a high quality and beautiful looking railing.
What you may wish to consider is to build deck railing
with posts that are connected to the deck boards by a low profile
surface mount anchor.
Take for example this low profile internal wood railing post anchor shown here.
At less than twenty bucks, it can be
used in code compliant residential rail applications when installed
according to the manufacuturer's engineering guidelines.
A Simple And Cost Effective Option
This is a potential solution for builing new wood deck railings,
replacing rotted railing posts, or as support posts for pergolas,
gazebos, decks, etc.
Then watch this video of a surface mount wood post anchor that has been tested for use with wood deck railings and costs less than $20 with all the hardware you will ever need and it covers all the possible situations described above.
So that's it.
A thorough analysis of how you can set back 45 degree railing posts into joist framing and an alternative solution for great looking railing. You decide which is right for your specific project.