Is Concrete Grinding Required After Rooftop Waterproofing Removal?
Yes, if you have used a floor scraper or a ride-on floor scraper to remove a Rooftop Waterproofing Membrane, then it’s going to be important to follow up with concrete grinding to ensure the subfloor is ready to accept a new waterproof membrane or coating.
Here’s why:
1. Residue and Adhesive Removal
After removing the rooftop waterproofing membrane (such as polyurethane, acrylic, epoxy or torched-on systems), remnants of adhesives, primers, or bonding agents often remain. Concrete Grinding eliminates these residues, ensuring the new membrane can properly adhere.
2. Surface Smoothing and Levelling
The removal process can leave uneven patches, high spots, or rough areas. Grinding evens out the surface, improving water flow and preventing ponding on flat rooftops.
3. Improved Adhesion for New Waterproofing
Most new waterproofing systems—especially liquid or sheet membranes—require a clean, mechanically abraded surface for optimal bonding. Grinding exposes fresh concrete, increasing the surface profile and adhesion strength.
4. Detection of Subsurface Defects
Grinding also helps reveal cracks, spalling, or weak concrete areas that might have been hidden under the old membrane, allowing for timely repairs before reinstallation.
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