TinnerFlow™1st YearSealing & InsulationYELLOW · Check First
Class A Seal Specification: Requires sealing all transverse joints, longitudinal seams (like Pittsburghs), and any fastener penetrations. * Class B: Requires sealing joints and seams only. Always look at the project specs-assume Class A for commercial systems unless told otherwise.
Class A Seal Specification: Requires sealing all transverse joints, longitudinal seams (like Pittsburghs), and any fastener penetrations. * Class B: Requires sealing joints and seams only. Always look at the project specs-assume Class A for commercial systems unless told otherwise.
Use this as training guidance. The foreman, approved drawings, project specs, manufacturer installation instructions, employer safety policy, and AHJ/code requirements always control the final answer.