Where should a ladder be placed for vertical ventilation?

Placing a ladder for vertical ventilation is critical for ensuring the safety of firefighters and allowing for efficient smoke and heat removal from a structure. The ideal position for a ladder is at a height of 3-5 rungs above the roofline. This positioning facilitates easy and safe access for firefighters to the roof while providing a secure point from which they can operate.

When a ladder is positioned 3-5 rungs above the roof, it allows firefighters to step off the ladder directly onto the roof without a large gap. This increases safety by minimizing the risk of slipping or falling, as they can step onto a stable surface without needing to reach too far down. Furthermore, this height enables them to start their ventilation operations promptly and effectively while maintaining their balance and control.

The strategy of positioning the ladder too high, such as at the roofline or even several rungs higher, can pose risks. While these placements may seem logical in aiming for direct access, they actually create an unsafe situation where firefighters might need to leap or stretch excessively to transition from the ladder to the roof.

Overall, the 3-5 rungs above the roof is a practical and safety-oriented strategy that leverages both accessibility and stability for firefighters engaged in vertical ventilation.