Gaps left at S-and-drive corners

S-and-drive corners need attention before you seal. A gap at the corner is usually a fit-up problem first, not a “more mastic” problem.

Watch out

• Do not bury a bad S-and-drive corner under a pile of mastic.

Check

• Check that S-cleat and drive are fully seated.
• Check drive ends are folded/locked if required.
• Look for out-of-square duct or a crooked drive.
• Fix fit-up before sealing.
• Ask if the corner gap is too large to seal as-is.

Steps

• Check that S-cleat and drive are fully seated.
• Check drive ends are folded/locked if required.
• Look for out-of-square duct or a crooked drive.
• Fix fit-up before sealing.
• Ask if the corner gap is too large to seal as-is.

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