Static field route #628

What do I do when not sealing around saddle tap?

Spiral, Round & Oval Duct InstallPolished core starter — shop/detail check

Treat a saddle tap like a real air connection, not just a piece sitting on round duct. Confirm the tap is seated to the duct, fastened correctly, sealed at the full perimeter, and supported so the joint does not peel open later.

Open in Field Rescue Open category

Field checklist

Verify the saddle/tap size and branch direction match the print or shop drawing.
Check that the saddle sits tight to the round/spiral surface without rocking or gaps.
Fasten per the approved shop/detail before sealing; do not use sealant to hold a loose tap in place.
Seal the full perimeter of the saddle/tap using the approved material and method.
Support the branch so its weight does not pull the saddle/tap loose after startup.

Ask foreman

This saddle tap is seated but I still need to seal the perimeter. What approved sealant/tape/mastic method do you want here before I close it up?

Do not

Do not leave the backside or heel of a saddle tap unsealed because it is hard to reach, and do not use mastic to hide a loose tap.

Why it matters

A saddle tap can look installed from the floor and still leak around the backside. The seal needs to follow the full connection, and the branch needs support so vibration and weight do not break the seal later.

Search words: Spiral, Round & Oval Duct Install not sealing around saddle tap saddle tap not sealed saddle tap leak saddle tap sealing around saddle tap not sealing around saddle tap saddle tap spin in takeoff round spiral seal mastic leak perimeter backside heel branch support airflow leakage saddle tap not sealed saddle tap leak saddle tap sealing around saddle tap not sealing around saddle tap