Which is the preferred method to cut a ventilation hole in a metal roof?

The triangular cut method is preferred for cutting a ventilation hole in a metal roof because it effectively maximizes ventilation while minimizing the risk of structural collapse. This technique allows for a larger opening, facilitating the escape of heat and smoke from the structure. The triangular shape also helps maintain the integrity of the remaining roof structure, preventing unnecessary weakening.

Louvered cuts, while useful for certain applications, do not provide as effective a means of ventilation in metal roofs where larger openings are needed. The trench cut, although beneficial for specific situations, can be more complex and may not be as efficient in a metal roofing context. The peak cut, while useful for certain designs, might not always be the most effective in ensuring that smoke and heat are drawn out effectively. Thus, the triangular cut stands out as a method that addresses both the needs for ventilation and structural stability.