5 Common Mistakes to Avoid When Using Self-Leveling Pedestals

Self-leveling pedestals have become a popular choice for raised flooring, rooftop decks, and outdoor tile installations. Their adjustable design and ease of use make them an attractive alternative to traditional methods. However, improper installation or oversight can lead to stability issues, drainage problems, or even premature wear. To help you get the best results, here are five common mistakes to avoid when using self-leveling pedestals.

1. Ignoring Surface Preparation

One of the most critical steps in any pedestal installation is ensuring the base surface is properly prepared. Some installers assume that because pedestals are adjustable, they can compensate for an uneven or unstable subfloor. However, if the ground beneath is soft, sloping, or riddled with debris, the pedestals may settle unevenly over time.

Before installation, always:

• Clean the surface of dirt, gravel, or loose materials.
• Check for proper slope (especially for rooftop decks where drainage is crucial).
• Use a leveling compound if the base has significant irregularities.
• Skipping this step can lead to shifting tiles, poor drainage, or even structural instability.

2. Overlooking Load Requirements

Not all pedestals are designed for the same weight capacity. A common mistake is assuming that all plastic pedestals can support heavy stone pavers or commercial-grade traffic. Exceeding the recommended load limit can cause pedestals to crack or collapse, especially in freeze-thaw climates.

Always:

• Check the manufacturer’s weight ratings.
• Consider dynamic loads (e.g., foot traffic, furniture, snow accumulation).
• Reinforce high-traffic areas with additional supports if needed.
• Choosing the right pedestal for your project’s demands ensures long-term durability.

3. Incorrect Pedestal Spacing

Self-leveling pedestals are designed to distribute weight evenly, but placing them too far apart can cause pavers or decking to sag. On the other hand, overcrowding them wastes materials and complicates installation.

A good rule of thumb:

• For standard pavers (12"x12" or larger), space pedestals 12-16 inches apart.
• For heavier materials (natural stone, large-format tiles), reduce spacing to 8-12 inches.
• Always follow the manufacturer’s guidelines for optimal support.
• Proper spacing prevents flexing and ensures a stable, level surface.

4. Neglecting Expansion Gaps

Outdoor installations are subject to temperature changes, causing materials to expand and contract. If tiles or decking are placed too tightly together, they can buckle or crack under thermal stress.

To avoid this:

• Leave a 1/8" to 1/4" gap between pavers or tiles.
• Use spacers during installation for consistent spacing.
• Ensure perimeter edges have room to expand.
• This small detail can prevent costly repairs down the line.

5. Skipping a Final Inspection

Once the pedestals and surface material are in place, some installers rush to finish without checking for stability. Over time, minor issues like loose pedestals or uneven tiles can worsen, leading to tripping hazards or water pooling.

Before completing the project:

• Walk across the entire surface to test for movement.
• Verify proper drainage by lightly spraying water and observing flow.
• Re-tighten any loose pedestal adjustments.
• A thorough final check ensures a safe, long-lasting installation.