How many SFRM thickness measurements are required for a metal deck that uses a flat plate?

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Multiple Choice

How many SFRM thickness measurements are required for a metal deck that uses a flat plate?

The main idea is to ensure the sprayed fireproofing thickness is representative across the deck area. For a metal deck using a flat plate, thickness variation can occur at different corners of the panel, so taking measurements at four locations captures performance in all four quadrants and provides a reliable average that aligns with the specification. If you measured fewer than four, you could miss a underspray at a corner or edge; more measurements aren’t required as the minimum, unless the project spec calls for it.

The main idea is to ensure the sprayed fireproofing thickness is representative across the deck area. For a metal deck using a flat plate, thickness variation can occur at different corners of the panel, so taking measurements at four locations captures performance in all four quadrants and provides a reliable average that aligns with the specification. If you measured fewer than four, you could miss a underspray at a corner or edge; more measurements aren’t required as the minimum, unless the project spec calls for it.

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