Master Streams Practice Test

The first line under a flat roof with metal trusses should always be directed where?

Across the roof Into the building interior near the door Down into the supported space Into the truss space

Correct Answer:

Into the truss space

Explanation:

When fighting a fire under a flat roof with metal trusses, you want the first line directed into the truss space. This hollow area between the ceiling and the roof often hides fire and heat, and the metal truss members can fail quickly under intense heat. Water applied here cools the truss members and reaches concealed flames, reducing the chance of a sudden collapse and slowing the fire’s spread into the structure. Spraying across the roof or into the interior near a door can miss hidden fire and waste water, whereas targeting the truss space attacks the most vulnerable area directly.

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