Cable Railing Installation: The Complete Overview

Cable railing installs break into four phases: post layout, post mounting, cable running, and tensioning. Most homeowners complete a straight deck run in a weekend with common tools.

1. Layout

Mark post centers no more than 4 feet apart. Runs longer than 40 feet or with multiple corners benefit from an intermediate tensioning post.

2. Mounting posts

• Surface mount: lag into joists or blocking — never decking alone.

• Fascia (side) mount: through-bolt with backing washers.

• Core mount: epoxy-set into concrete.

3. Running cable

Feed cable through intermediate posts before attaching fittings. Keep runs untwisted — spin the spool, not the cable.

4. Tensioning

Tension from the middle cable outward, alternating up and down. Cables should deflect no more than 3/8 inch under firm hand pressure.

5. Common mistakes

1. 1

   Drill all post holes first

   Mark and drill every hole before setting any posts — adjustments are much harder once posts are fixed.

2. 2

   Set end and corner posts first

   These are your anchors. Use them to string a reference line for aligning intermediate posts.

3. 3

   Dry-run the cable

   Thread cable without fittings to confirm routing, count, and any obstructions before committing.

4. 4

   Re-tension after 30 days

   Cables stretch slightly as they seat. A single re-tension pass after the first month keeps deflection within spec.

Mounting options compared

Frequently asked questions