How To Install Paired 45 Degree Set Back Corner Railing Posts
Another challenging situation is a when you have double 45 degree
corner posts that are set back from the corner and attached to the
inside of the rim joist. This is similar to other 45 degree corner
framing techniques but here the posts are further apart as the
Setting a pair of posts further apart on the inside of the rim joist
at this kind of corner will require your patience and attention to
You can see in the drawing that one of the joists is cut short to allow a pair of 45 degree blocking pieces.
In addition there is a long threaded rod required which is an
extra level of detail and work to make this whole post configuration
come together properly.
The last thing you will have to consider is filling the gap
between the two posts so that no single opening between posts or
balusters is greater than 4" (10 cm). This makes for some finicky
railing work and is one of the main reasons this kind of construction
method is not as common as using a single corner post.
This is not for first time builders. You should be competent
cutting angles with your circular saw and accurately. Take note of the
blocking and the hardware you will need.
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Required Hardware And Cost
There are four custom cut 2x8 blocking and two very long threaded
rods. You will need a long ½" drill bit and a steady hand to make the
This makes for a strong set of set back corner posts set inside the perimeter joist.
This way of installing set back rail posts at corner locations is
difficult for a the average homeowner and can be well beyond the ability
or desire of most people to install all this hardware, or notch the
decking boards around each post.
Some don't want to have their posts and railing off set back away
from the corner because of the complications with the railing to fill
The other challenge for many people is the vulnerability of the
wood posts to moisture damage over the years because of direct wood on
If you fall into this camp, 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 very good solution for building 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 there you have it.
A thorough explanation of building traditional wood railing for decks and alternative solutions for great looking deck railing. You decide which is right for your specific project.