Which defensive strip variant is used when construction is near the beam?

• A. A hose line
• B. Defensive Strip With Construction (Off Beam)
• C. Defensive Strip (LWP Roof Diagram)
• D. Defensive Strip Against Construction (Off Purlin)

Answer: (B)

Defensive strips are designed to create a controlled opening for venting while keeping critical structural elements protected. When construction is close to the beam, the edge of the cut needs to be offset from that beam to avoid weakening or damaging it and to keep the construction from interfering with the vent path. The Defensive Strip With Construction (Off Beam) variant does exactly this: it places the strip off the beam to maintain a safe clearance around the structural member while still providing a reliable vent opening for heat and smoke. This approach protects the beam and nearby construction, reduces the risk of igniting or compromising structural components, and preserves a clear vent path. Other variants address different proximity scenarios (for example, near purlins or tied to a specific roof diagram), so they aren’t the right fit when the concern is construction right near the beam. A hose line, while essential for suppression, isn’t a defensive strip variant used for this purpose.