Hyderabadghar/Do it your self/How to Install Top and Bottom Deck Rails

Well-installed top and bottom deck rails provide the framework required for stunning baluster, top cap, and post cap designs. The steps below will show you how to install sturdy rails to border your deck.

Before you begin, consider these tips for a successful installation:

Measure and install the top rails before the bottom rails. Mark, cut, and install just one length at a time because each installation may nudge a post over slightly, changing measurements for the next length. Before attaching the rails, check the posts for plumb!

PROJECT BASICS

Project: Moderate

Estimated Project Time: 2 hours

Estimated Project Cost: Varies with the project

Start Tips:

Safety Tips: Always hold a circular saw firmly, usually with both hands so you know where they are

Recommendation:

Fig. 1

INSTRUCTIONS

1) Mark and cut rails
If some rail lengths cannot span from post to post, but instead must join between posts, here's what to do: temporarily attach one of the rails to the posts. Hold the next length in position just over or under it, and mark a cut line through both pieces where they overlap and will join (Fig. 1).

Note that they'll intersect with an angled cut, as below.

Fig. 2

2) Make scarf joints for long rails
If your rails are not long enough to span the entire run, splice them on the posts using scarf joints (Fig. 2).

These joints look better than butt joints and won't leave a gap if the wood shrinks. Cut the pieces at 45 degrees, and drill pilot holes for screws or nails.

Fig. 3

3) Install the stair railings
The easiest way to mark for cuts on the stair rail is to tack the rail in place before marking it.

First, check the posts for plumb. Then, tack on the stair rail so it's parallel with the stringer, as shown (Fig. 3).

On the elevated end of the stair rail, mark for two cuts: one level with the top of the deck rail and one flush with the butt end of the deck rail. Then, using a level, mark the stair rail's bottom end to cut it even with and plumb to the end of the stringer beneath.
Finally, mark the lowest stair post to cut its top flush with the top of the stair rail.

Cut the lowest stair post and the stair rail with a circular saw. Next, attach the stair rail to the post with 3-inch decking screws or 16d galvanized nails, drilling pilot holes for all fasteners. Take special care to make these joints firm, because they'll receive a lot of wear and tear.