Which method is commonly used to evaluate the integrity of SFRM adherence?

Evaluating the integrity of Spray Applied Fire Resistive Material (SFRM) adherence primarily involves bond strength testing. This method measures the adhesion between the SFRM and the substrate it is applied to, which is critical for ensuring that the fireproofing material will perform effectively in a fire scenario.

Bond strength testing can be conducted through various techniques, such as pull-off tests, where a specific force is applied to a small area of the fireproofing material to determine how much force it can withstand before detaching from the underlying structure. This not only provides a quantitative measure of adherence but also highlights any potential weaknesses in the application or material quality.

While visual assessments can identify obvious defects and density testing can evaluate material composition, they do not provide a direct measurement of how well the SFRM adheres to the substrate. Thickness measurement, on the other hand, is essential for assessing compliance with fire-resistance requirements but is not specifically a measure of adherence integrity. Therefore, bond strength testing is the most relevant method for evaluating SFRM adherence.