Secure Stringers to Foundation & Top Support
From Deck Stairs · Step 4 of 8 · Video by Scott Brown Carpentry

Showing 5:03–5:51 of the source video. Watch the full video with every moment.
What happens in this clip
After the concrete footings have cured and the first stringer is in place, position the remaining stringers. Trace the first stringer onto new lumber boards and cut them (if not already done). Place the stringers onto the metal brackets in the concrete footings and against the upper structure. Secure the bottom of each stringer to its respective metal bracket using bolts, and fasten the top of each stringer to the deck framing with screws. For longer staircases, consider adding an intermediate support post, set in rapid-set concrete, beneath the middle of the stringers to prevent sagging.
Goal: Permanently install all stair stringers and structural supports
What's used
Tools
- Bolts/Anchors
- Cordless Drill Makita
- Screws
- Structural screws
- Spirit Level DeWalt
- Wrench
Materials
- Cut Stringers
- Rapid-Set Concrete Mix
- Timber Post (for support)
About the full video
This project details the process of planning, marking, cutting, and installing wooden stair stringers for an outdoor staircase. It covers calculating the rise and run, using a framing square to transfer measurements, making cuts with a circular saw and handsaw, preparing a concrete foundation, and finally securing the stringers and adding structural support.
Step 4 of 8: Secure Stringers to Ground
Position the bottom of the stringers onto the prepared ground area, aligning them with the marks made in Step 2. Ensure the stringers are plumb and securely fastened to a stable base. This can be achieved by using concrete footings, metal stringer connectors anchored to concrete, or by burying the stringers slightly if local codes permit and the ground is stable.
Every video in Deck Stairs
Step 1: Prepare the Stair Location
- 13:17–15:33 Prepare Stair Base and Pour Concrete Pad
- 5:20–6:48 Prepare Base and Install Stair Stringers
Step 2: Mark Stringer Placement
Step 3: Attach Stringers to Deck
- 1:08–1:44 Attach Stringers to Deck Frame
- 3:14–3:53 Attach Stringers and Secure Lower Posts
- 9:31–10:14 Install Stringer Hangers and Stringers
Step 4: Secure Stringers to Ground
- 10:09–11:12 Securing Stringers to Landing Pad with Base Plate
- 5:03–5:51 Secure Stringers to Foundation & Top Support (this video)
- 1:26–1:43 Anchor Stringer Base to Footing
Step 5: Cut and Attach Risers (Optional)
- 6:51–7:45 Install New Risers and Treads
- 3:00–3:09 Attach Treads and Risers
- 7:22–9:28 Install Stringers and Attach Risers/Treads
Step 6: Install Treads
- 11:12–11:54 Attaching Tread Boards
- 1:50–2:00 Install Stair Treads
- 1:44–2:00 Attach Decking (Treads and Risers)
Step 7: Install Railings
- 1:03–1:26 Install Railing and Balusters
- 13:45–15:23 Install Railings and Balusters
- 12:17–14:26 Install Railing Rails and Balusters
Step 8: Final Inspection and Finishing Touches
- 0:34–0:55 Complete Trim and Final Cleanup
- 5:07–5:29 Final Review and Clean-up
- 0:28–0:29 Final Review and Completion
Questions about Deck Stairs
What tools and materials are essential for building deck stairs using pre-cut stringers?
You will need basic tools like a measuring tape, level, drill with drill bits, shovel, and rake for site preparation. Key materials include pre-cut pressure-treated pine stair stringers, gravel and concrete mix for securing the base, appropriate exterior structural lag screws, and decking boards for the treads. The specific list provided includes items like Anvil digging shovel, OX marking pencil, Empire plumb bob, Quikrete gravel, SAKRETE concrete mix, SPAX lag screws, and Composite Decking Boards.
What are the most critical safety precautions I should take when building deck stairs?
Safety is paramount for structural projects like deck stairs. Always wear appropriate personal protective equipment, including safety glasses, gloves, and sturdy footwear. Ensure all connections are secure and stable, especially where stringers attach to the deck and ground. Always follow manufacturer's instructions for materials and power tools, and verify stability at each step.
How can I ensure my deck stairs comply with local building codes?
Compliance with local building codes is crucial for safety and legality. Before starting, consult your local building department for requirements on rise, run, width, handrails, and foundation for deck stairs. These codes vary by location and are designed to prevent structural failure and ensure safe use. Hiring a licensed professional can help navigate these complex requirements.
What common mistakes should a beginner avoid when installing pre-cut stair stringers?
A common mistake is improper site preparation, leading to unstable ground support. Ensure the ground is level, well-compacted, and has adequate drainage using gravel and pavers. Another error is not securely attaching the stringers to both the deck and the ground, which can compromise the entire structure's stability. Always double-check measurements and use a plumb bob and level for accurate placement.
What is the estimated time commitment and difficulty for this deck stair project?
This project is rated as 'beginner' difficulty with an estimated time of 3 days. However, factors like your experience level, site conditions, and adherence to local codes can extend this. Breaking the project into manageable steps and having all tools and materials ready will help keep it on schedule.
Are there alternative materials or methods for securing deck stair stringers to the ground?
While the project suggests gravel, concrete mix, and pavers, alternative methods for ground support include concrete footings or pre-cast concrete piers. The chosen method depends on local frost lines, soil conditions, and building codes. Always ensure the ground connection is robust and prevents settlement or shifting over time.
Deck Stairs
This project outlines the process of building deck stairs using pre-cut stringers. It covers site preparation, attaching the stringers to the deck, securing them to the ground, and installing treads and railings. Safety is paramount throughout the process, and it's recommended to consult local building codes and consider hiring a professional for complex steps.
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