What is Scarifying? (Surface Prep)

What is Scarifying? (Surface Prep Explained)

Scarifying is using a machine with metal cutters to scratch and groove the concrete surface so a new overlay can stick to it. Proper surface preparation is essential for overlays to bond. Understanding scarifying helps you understand how overlays are properly installed.

What is Scarifying?

Scarifying is:

Surface preparation: Mechanical surface preparation
Machine operation: Uses specialized machine
Creates texture: Scratches and grooves surface
Prepares for overlay: Essential for overlay bonding

How It Works

The scarifying process:

Machine with cutters: Uses rotating metal cutters
Scratches surface: Cuts grooves into concrete
Creates texture: Makes surface rough
Removes surface: Removes smooth, sealed surface
Prepares for bonding: Creates surface overlay can stick to

Why Scarifying is Necessary

Smooth concrete won't bond:

Smooth surface: Smooth concrete is too slick
No bond: Overlay can't stick to smooth surface
Needs texture: Rough surface is needed for bonding
Removes sealer: Removes old sealer that prevents bonding

When Scarifying is Required

Scarify when:

Installing overlay: Before applying concrete overlay
Resurfacing: Before resurfacing concrete
Applying coating: Before certain coatings
Surface is smooth: When existing surface is too smooth

Depth of Scarifying

Scarifying depth:

1/8 to 1/4 inch: Typical depth
Enough to roughen: Creates adequate texture
Not too deep: Don't cut too deeply

The Bottom Line

Scarifying is using a machine with metal cutters to scratch and groove the concrete surface so a new overlay can stick to it. Smooth concrete won't bond to overlays—scarifying creates the rough texture needed for proper bonding. It's essential surface preparation for overlays and resurfacing. Without proper scarifying, overlays won't bond properly and will fail.

Need surface preparation? Contact Local Concrete Contractor. We properly prepare surfaces including scarifying when needed for overlays and resurfacing.