Quick Answer
Flashing installation is not strictly mandatory for every roof-mounted solar panel system, but it is highly recommended. While local building codes and regulations may vary, a properly installed flashing system is essential to prevent water ingress and structural damage. Without flashing, the risk of roof damage and system failure increases.
Why Flashing Matters
Flashing is a critical component of a roof-mounted solar panel system, serving as a barrier between the roof and the solar panel mounting hardware. Its primary function is to direct water away from the roof, protecting it from damage caused by water infiltration. A well-designed flashing system typically consists of a waterproof membrane or sealant, installed around the solar panel mounting hardware and roof penetrations. The International Building Code (IBC) recommends a flashing system that is “compatible with the roof covering and shall be installed in accordance with the manufacturer’s instructions” (IBC 2009, Section 1503.4).
Types of Flashing and Installation Techniques
There are several types of flashing available for roof-mounted solar systems, including self-adhered membrane flashing, metal flashing, and EPDM (rubber) flashing. Self-adhered membrane flashing is a popular choice due to its ease of installation and high level of water resistance. When installing flashing, it’s essential to follow the manufacturer’s instructions and local building codes. A good rule of thumb is to install flashing at a minimum of 6 inches (152 mm) above the roof’s highest penetrations, and to ensure a watertight seal around penetrations and mounting hardware.
Find more answers
Browse the full Q&A library by topic, or jump back to the topic this question belongs to.