Do I need to seal the longitudinal seams, or just the transverse joints?

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.']

Stop if

• 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.

Steps

• Class A Seal Specification: Requires sealing all transverse joints, longitudinal seams (like Pittsburghs), and any fastener penetrations. Class B: Requires sealing joints and seams...

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