Adhesion Pull-Off Test
A test in which a dolly is bonded to the coating and pulled off under measured force, recording both the load and where the failure occurred.
On an actual building
Where the failure occurs matters more than the number. Failure within the concrete means the bond exceeded the substrate's own strength; failure at the interface means the preparation or primer was inadequate.
What we most often have to correct
That a high number alone proves a good job. A high reading with an interface failure still indicates a bonding problem.
Terms that come up alongside this one
- Dry Film Thickness (DFT)
The thickness of a coating after it has cured, measured with a gauge across a grid of points..
- Primer
A preparatory coat applied to a substrate to seal it, improve adhesion and provide a compatible surface for the system that follows..
- Laitance
The weak, fine layer of cement and fines that rises to the surface of concrete as it cures and bleed water evaporates.
Adhesion Pull-Off Test — questions we get asked
What does adhesion pull-off test mean in waterproofing?
A test in which a dolly is bonded to the coating and pulled off under measured force, recording both the load and where the failure occurred.
Why does adhesion pull-off test matter on a real project?
Where the failure occurs matters more than the number. Failure within the concrete means the bond exceeded the substrate's own strength; failure at the interface means the preparation or primer was inadequate.
What do people commonly get wrong about adhesion pull-off test?
That a high number alone proves a good job. A high reading with an interface failure still indicates a bonding problem.
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