To do this, position the cut length
of post up against the base of the outside stair stringer, and into position
next to the bottom tread. Make three pencil marks on the stair tread to identify
the stair tread material that must be removed. Use a handsaw to cut away this
block of material.
To attach the stair railing posts,
drill two ¼ inch diameter holes in the post and through the stringer,
approximately 3 inches from each other and vertical to one another. Use 4-1/2”
carriage bolts with washers and nuts to secure the stair railing post to the
If deck stair railings are
required on both sides of the stairs, repeat the process on the other side.
Assuming there is deck railing
already installed on the deck surface, measure the distance between the
bottom deck stair railing posts and the posts on the deck surface that are
adjacent to the deck stairs.
Cut a 2x4 to this measured
length. Note that you will need to make angled cuts on both ends of the
length of 2x4.
The necessary angle should be able to
be derived from the stair rise over run measurements.
Fasten the deck stair railings to the
deck posts using 3 inch deck screws. I prefer to pre-drill pilot holes in the
deck railings to prevent splitting when screwing in the deck screws.
Repeat this process for the bottom
deck rail section and for the other side if a deck stair railing is required
there as well.
Note that the gap between the
bottom deck railing and the stairs should not exceed 6 inches.
To install balusters find the
middle of the deck railing and make a pencil mark. Assuming a 4 inch spacing
between balusters, make a pencil mark 2 inches on either side of this first
Next cut balusters to length to
fit between the deck stair railings.
Photo by Mark Donovan
Again use the same angle, or slope,
as the deck stairs for making the cuts.
Attach the first two balusters so
that their centers are directly underneath the two pencil marks that are
adjacent to the center railing mark. This should result in a 4” on-center
spacing between the two balusters.
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Continue to install additional
balusters outward from the center of the deck stair railings, on 4 inch center
spacings using the first two installed balusters as a reference point.
To fasten the balusters to the deck
stair railings, use 3 inch deck screws.
Finally, to complete the building of
deck stair railings, cap the top of the deck stair railing with a piece of
decorative trim deck railing to hide the screws and to achieve a more
For help on building a new Deck, see HomeAdditionPlus.com's
Deck Installation Bid Sheet.
Deck Installation Bid Sheet
will teach your how to hire the right deck contractor, and help to ensure that your
deck project is completed on time and budget.
How to Finance your Deck Project -
can help provide funds for your new home improvement project if financing is
Additional Deck Information