Common Mistakes to Avoid When Using Pedestals on Rooftop Terraces

When using pedestals on rooftop terraces, there are several common mistakes to avoid to ensure a durable and functional installation. Here are the key points to consider:

8 Rooftop Terrace Pedestals Mistakes to Avoid

1. Overlooking Structural Integrity

One of the most critical aspects to consider is the structural integrity of the rooftop. Before installing a pedestal system, it’s essential to ensure that the underlying structure can support the additional weight of the pedestals, decking, and any additional loads.

Failing to do so can lead to structural issues and costly repairs. Always consult with a structural engineer to assess and approve the load-bearing capacity of your rooftop before installation.

2. Ignoring Proper Drainage

Effective drainage is crucial in preventing water damage and ensuring the longevity of your rooftop terrace. Pedestal systems are designed to facilitate drainage, but if the installation is not done correctly, water can accumulate and cause problems.

Make sure the pedestal system is installed with a slight slope to direct water towards drains and that any drainage channels are clear of debris. Also, consider using waterproof membranes or protective layers beneath the pedestals to add an extra layer of defence against potential leaks.

3. Choosing the Wrong Type of Pedestals

Pedestals come in various types and materials, each suited to different conditions and loads. Using the wrong type of pedestal for your specific rooftop conditions can lead to instability or premature wear.

For example, if your rooftop is exposed to high winds, you'll need pedestals that can handle additional stabilisation. Research the different options available and select pedestals that are appropriate for your terrace’s environmental conditions and load requirements.

4. Inadequate Spacing and Placement

Proper spacing and placement of pedestals are essential for a stable and even surface. Pedestals should be placed at regular intervals to ensure uniform support for the decking.

Avoid placing them too close together, as this can lead to overloading and instability, or too far apart, which might cause the decking to sag or flex. Follow the manufacturer's recommendations for spacing and ensure that the placement aligns with the design of your terrace.

5. Neglecting Expansion Gaps

Decking materials often expand and contract with temperature changes. It’s important to leave appropriate expansion gaps between the decking boards to accommodate this movement. 

If these gaps are not provided, the decking can buckle, warp, or become misaligned over time. Ensure that your installation plan includes allowances for expansion and contraction to maintain the integrity and appearance of your rooftop terrace.

6. Failing to Address Ventilation Needs

Adequate ventilation is important to prevent moisture buildup and ensure a longer lifespan for both the pedestals and decking. If the space beneath the decking is not properly ventilated, it can lead to trapped moisture, which can cause mould, rot, and structural damage. Make sure that the pedestal system allows for sufficient airflow and that there are no obstructions that could impede ventilation.

7. Skipping Routine Maintenance

Like any outdoor installation, pedestal systems and decking require regular maintenance to stay in good condition. This includes cleaning debris from between the pedestals, checking for any signs of damage, and ensuring that drainage systems are functioning correctly. Neglecting routine maintenance can lead to problems that could have been easily prevented with regular care.

8. Ignoring Building Regulations

Local building codes and regulations often have specific requirements for rooftop terraces, including load limits, materials, and installation methods. Ignoring these codes can result in legal issues or safety concerns. Always check with local authorities to ensure that your pedestal installation complies with all relevant building codes and regulations.

Pedestals from Raaft®

Using pedestals on rooftop terraces can offer a stylish and practical solution for outdoor spaces, but it’s essential to approach the installation with careful planning and attention to detail.

To find out more about our support structure or discuss your ideas for a roof terrace, contact the experts at Raaft® today.