Gasket displaced while lifting duct into place

If the gasket moves during the lift, stop and restage the joint before bolting. The gasket must stay continuous and seated at the flange/corners before tightening.

Stop if

• The gasket keeps moving while we lift this section. Do you want adhesive/tack, a second hand, or a different staging sequence before we bolt it?

Watch out

• Do not bolt over a rolled, displaced, cut, dirty, or missing gasket and try to hide it with mastic later.

Check

• Clean the flange face and check the gasket path before the lift.
• Dry-fit the gasket and corners while the piece is low if possible.
• Use the approved gasket adhesive/tack method only if your shop/project uses it.
• Have a second person watch or hold the gasket during positioning when needed.
• Recheck the full gasket line before the first bolt/cleat gets tight.

Steps

• Clean the flange face and check the gasket path before the lift.
• Dry-fit the gasket and corners while the piece is low if possible.
• Use the approved gasket adhesive/tack method only if your shop/project uses it.
• Have a second person watch or hold the gasket during positioning when needed.
• Recheck the full gasket line before the first bolt/cleat gets tight.

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