For the use of liquefied petroleum gas (LPG) on an occupied roof, what type of material must the roof be constructed from according to the affidavit?

When it comes to the use of liquefied petroleum gas (LPG) on an occupied roof, the affidavit specifies that the roof must be constructed from non-combustible materials. This is crucial for ensuring safety during torch operations, as non-combustible materials are designed to resist ignition and prevent the spread of fire.

Using non-combustible materials significantly reduces the risk of fire-related incidents, especially when there is a potential for ignition sources like LPG torches. In environments where the public or occupants are present, maintaining stringent safety standards is essential to protect lives and property.

By contrast, flammable materials would pose a significant risk, as they could easily ignite if flames or sparks are present. Steel is a type of non-combustible material, but the requirement is broader and does not specify any particular material such as steel or wood. Wood, being combustible, is unsuitable for the same reason. Therefore, emphasizing non-combustibility as a general standard is vital for the safety and compliance of torch operations on occupied roofs.