Which actions are not allowed when performing thickness testing on TFIFRM?

In thickness testing on Thermal Fireproofing Insulation for Reinforced Metal (TFIFRM), certain actions are prohibited to ensure the integrity and reliability of test results. Among the options provided, claiming that "All of the above" are not allowed indicates that none of the listed actions are permissible in this specific testing context.

Incremental testing may imply a method where measurements are taken in a non-uniform or unstandardized fashion, leading to potential inaccuracies in assessing the overall thickness of the fireproofing material. A lack of consistent and controlled measurement methodology can compromise the validity of the fireproofing's assessed effectiveness.

Using a calibrated device is typically essential in any testing process to ensure accurate readings; however, if the context deems it unallowed, it implies that specific calibration requirements might not be adhered to or that the authorized method does not involve the use of devices, possibly steering towards manual methods which can lead to subjective interpretations.

Visual inspection, while useful for certain assessments, does not provide the quantitative data needed for thickness evaluation. Depending solely on visual methods would fail to deliver the precise measurements required to ensure fireproofing standards are met.

By identifying that all these methods are not allowed, it underscores the importance of following standardized procedures in thickness testing to