Spiral seam/joint after connection not sealed

Spiral joints need to be sealed after screwing - screws alone do not create an airtight connection. The seal goes on after the joint is mechanically complete and confirmed fully seated.

Stop if

• Is mastic or listed tape the approved seal method for spiral joints on this job? And does the spec require sealing the longitudinal seam on the pipe length, or just the transverse connections?

Watch out

• Do not force, crush, or screw round duct into a bad fit.

Check

• Confirm the joint is fully seated and has the required fasteners before opening sealant. Sealing a partially seated joint locks the problem in.
• Clean the joint area - remove dust, oil, or debris from the metal surface where the sealant will land. Mastic will not bond to contaminated metal.
• Apply the approved seal method around the full circumference of the joint per project spec, manufacturer direction, or shop standard.
• Check the longitudinal spiral seam on each pipe length for visible gaps or opened seams - those need to be sealed too if the spec requires it or if they are visibly open.
• Do not insulate or cover the joint until the sealant is applied and ready for the next step per the product/job requirements.

Steps

• Confirm the joint is fully seated and has the required fasteners before opening sealant. Sealing a partially seated joint locks the problem in.
• Clean the joint area - remove dust, oil, or debris from the metal surface where the sealant will land. Mastic will not bond to contaminated metal.
• Apply the approved seal method around the full circumference of the joint per project spec, manufacturer direction, or shop standard.
• Check the longitudinal spiral seam on each pipe length for visible gaps or opened seams - those need to be sealed too if the spec requires it or if they are visibly open.
• Do not insulate or cover the joint until the sealant is applied and ready for the next step per the product/job requirements.

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