Install Stair Treads with Mechanical Fasteners

What happens in this clip

After applying glue, insert the tenon supports into their respective holes. Carefully position each stair tread, aligning it with the main pole and previous treads. Drive construction lag screws through the underside of the treads into the main pole and tenons to provide mechanical strength. If there's any play or wobble in the joints, use wooden shims to tighten the fit. Trim any excess shim material with a utility knife. Utilize a laser level to ensure each new tread is plumb and accurately spaced relative to the one below it. This method enhances both the stability and durability of the staircase.

Goal: Attach the glued tenon supports and treads to the main pole using construction lag screws, incorporating shims to ensure a tight, wobble-free fit. Use a laser level for accurate alignment of each tread.

What's used

Tools

• Drill/Driver DeWalt
• Hammer
• Laser Level
• Safety Glasses
• Utility Knife

Materials

• Construction Lag Screws
• Wooden Shims

About the full video

This video details the process of constructing a rustic spiral staircase inside a wooden cabin. The project involves preparing the main support pole, shaping and sanding individual stair treads, creating tenon joints for structural integrity, and assembling the components using a combination of glue, screws, and custom wooden plugs for a seamless finish. The creator highlights techniques for achieving a rustic aesthetic while ensuring strength and durability.

Step 8 of 9: Reassemble Staircase Components

Carefully reattach all treads, balusters, and railing sections to the central pole and to each other. Ensure all connections are secure and that the staircase is stable. Tighten any bolts or screws as needed.

Open this step in the guide

Every video in How to Update a Spiral Staircase

1. Step 1: Assess Existing Staircase Condition

   • 1:02–1:35 Visually Inspect for Staircase Wear and Damage
   • 0:00–0:53 Assess Damage & Prepare for Repair
   • 0:15–0:30 Initial Inspection and Hazard Identification

2. Step 2: Clean and Degrease Components

   • 2:29–3:41 Prep Day: Cleaning and Sanding
   • 1:52–2:08 Scrape Loose Paint Flakes
   • 0:34–0:40 Mechanically Remove Loose Rust and Flaking Material

3. Step 3: Prepare Metal Surfaces for Finishing

   • 0:37–0:41 Sand the Staircase
   • 0:07–1:27 Sand and Prime the Staircase
   • 0:32–1:08 Clean, Sand, and Tape the Staircase

4. Step 4: Prepare Wood Treads for Finishing

   • 0:20–0:25 Sand and Finish Treads
   • 0:21–1:25 Prepare Treads (Sanding and Cleaning)
   • 2:06–2:52 Sand Stair Treads and Risers

5. Step 5: Apply Primer to Metal Components

   • 0:20–0:23 Apply Rust-Inhibiting Primer
   • 2:51–3:32 Apply Oil-Based Primer
   • 0:32–1:06 Apply Rust-Inhibiting Primer

6. Step 6: Apply Finish to Metal Components

   • 3:22–4:09 Paint Metal Frame (Top Coat)
   • 0:14–0:28 Apply Oil-Based Enamel Topcoat to Iron
   • 2:25–2:48 Apply Top Coat Paint

7. Step 7: Apply Finish to Wood Treads

   • 4:29–5:04 Stain New Stair Treads
   • 3:22–3:28 Stain & Seal Stair Treads
   • 3:41–4:00 Seal Stained Treads

8. Step 8: Reassemble Staircase Components

   • 0:47–0:50 Reinstall Metal Railing
   • 0:22–0:31 Secure All Treads and Joints
   • 13:30–15:00 Install Stair Treads with Mechanical Fasteners (this video)

9. Step 9: Final Inspection and Touch-ups

   • 1:08–1:37 Final Assembly and Inspection