Should stair stringers touch the ground?
Should Stair Stringers Touch the Ground?
Brief Summary
No, stair stringers should not directly touch the ground. This is to prevent moisture damage and rot, which can compromise the structural integrity of the stairs. The best practice is to rest the stringers on a solid, level surface that is well-drained to keep them away from ground moisture.
Expanded Answer
Why Should Stringers Not Touch the Ground?
- Moisture Damage: Direct contact with the ground exposes the wood to moisture, which can lead to rot, decay, and insect infestation. This weakens the stringers, making them unsafe over time.
- Uneven Settlement: The ground can shift and settle unevenly, causing the stringers to become misaligned. This can affect the stability of the stairs and create tripping hazards.
- Frost Heave: In cold climates, the ground can freeze and expand, causing the stringers to lift and buckle. This can damage the stairs and make them unsafe.
Proper Landing Surface for Stringers
The ideal landing surface for stair stringers is a level, stable, and well-drained area that elevates them above the ground. Here are some common options:
- Concrete Pad or Footing: A concrete pad or footing provides a solid and durable foundation for the stringers. It can be poured in place or precast.
- Pressure-Treated Lumber: Pressure-treated lumber can be used to create a landing pad for the stringers. This is a more affordable option than concrete, but it is important to ensure that the lumber is rated for ground contact.
- Paver Blocks or Gravel: Paver blocks or compacted gravel can be used to create a well-drained surface for the stringers. This is a good option for areas with poor drainage.
Building Code Requirements
Building codes typically require that stair stringers be supported on a solid and stable surface. They may also specify the minimum clearance between the stringers and the ground. It’s important to check with your local building department to ensure that your stair construction complies with all applicable codes.
Additional Considerations for Stair Construction
- Material Selection: Choose durable and weather-resistant materials for the stringers and other stair components. Pressure-treated lumber, cedar, and redwood are good options.
- Protective Coatings: Apply a protective coating to the stringers to help prevent moisture damage. This is especially important in areas with high humidity or frequent rain.
- Regular Maintenance: Inspect the stairs regularly for signs of damage or wear. Make repairs as needed to keep the stairs safe and functional.
Conclusion
Ensuring your stair stringers do not touch the ground is a crucial aspect of building a safe and long-lasting staircase. By following the best practices outlined above and adhering to building codes, you can protect your investment and ensure the safety of those using the stairs.