Static field route #113 What do I do when gasket displaced while lifting duct into place? Rectangular Duct Assembly: TDC / Ductmate / Flanges Polished core starter — connector/detail check
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.
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Field checklist 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. Ask foreman 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?
Do not Do not bolt over a rolled, displaced, cut, dirty, or missing gasket and try to hide it with mastic later.
Why it matters A gasket that slides during the lift can look fine from one side but leak, twist, or fail inspection after the joint is tightened.
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