What is the minimum allowable test area for SFRM thickness?

The minimum allowable test area for Spray-Applied Fire-Resistive Materials (SFRM) thickness is important in ensuring that the fireproofing material is adequately represented in test evaluations. Typically, a larger test area, such as 48 square inches, is preferred. This size allows for a more accurate representation of the thickness and coverage consistency, which is crucial for performance assessments. Testing smaller areas may not reflect the actual application's effectiveness and could yield inconsistent results due to potential variations in application techniques or material distribution. A test area of 48 square inches thus meets the standards set forth in industry guidelines, ensuring reliability in the assessment of fire-resistive properties.