Apprentice question
Field check
Standard work. Do it right, keep moving.
A Pittsburgh seam has to be mechanically folded tight before it is sealed. If a section is left open, knock it down fully before mastic goes over it.
['You use a hand duct hammer to knock down the long Pittsburgh lockseam pocket on a 5-foot section of rectangular duct, but you skip a 1-foot section in the middle because it was tough to reach, leaving the metal lip un-folded.', 'A Pittsburgh seam has to be mechanically folded tight before it is sealed. If a section is left open, knock it down fully before mastic goes over it. The likely recovery is to check the condition, correct prep/setup if it is within your assignment, and bring the foreman clean information before the work creates rework overhead.']