Can You Install Drainback Collectors on a Steeper Roof?

Design Considerations for Steeper Roofs

When installing drainback collectors on a steeper roof, the primary concern is ensuring proper drainage and preventing system failure due to backflow or airlocks. To mitigate these risks, designers can use a combination of techniques, such as reducing the system’s fill pressure or incorporating additional drainage features, like drain valves or expansion tanks. A steeper roof may also require larger, more robust collector arrays to maintain adequate flow rates and prevent overheating.

Steeper Roof Installation Limitations and Solutions

While steeper roofs can accommodate drainback collectors, there are some limitations and design considerations that must be addressed. Typically, drainback collectors are designed for slopes between 15° and 45°. For steeper slopes, above 45°, designers may need to use specialized collector designs or employ additional measures to prevent backflow and ensure proper system operation. In some cases, a drainback system may require a secondary drainage system or additional support structures to maintain stability and prevent system failure.

Collector Array Design and Size Considerations

When designing collector arrays for steeper roofs, it’s essential to consider the increased risk of backflow and airlocks. To mitigate these risks, designers can increase the collector array size to maintain adequate flow rates and prevent overheating. A typical design guideline is to increase the collector array size by 10-20% for every 10° increase in roof slope above 45°. For example, a collector array designed for a 45° slope may require a 50-60% increase in size for a 60° slope.