Seal Class A/B/C
Under-sealing a high seal-class run; fails leakage test
Yellow / Check First2ndBatch 4
What This Helps With
Under-sealing a high seal-class run; fails leakage test
Apprentice words: seal class
Trade terms: seal class, seal class A/B/C, transverse/longitudinal/penetrations
Check First
Seal class letter and which seams/joints/penetrations it covers
What Not To Do
Skip longitudinal seams on class A
What can go wrong: Sealing only transverse joints when class A is required
Better Foreman Question
What seal class is this system and does it include penetrations?
Verify With
Reference type: SMACNA
Source to verify: SMACNA seal classes; project spec
Safe wording: Explain letters plainly; the assigned class is on the spec.