31/10/2026
Why do we grind subfloors before installing new flooring?
Whether we’re working with a brand new screed or an existing subfloor, mechanical grinding is often an important part of getting the preparation right.
On new screeds, we’re removing surface laitance, curing agents and other weak surface layers that could interfere with the adhesion of primers and smoothing compounds.
On existing floors, grinding can also remove old adhesive residues, high spots and general contamination such as paint, plaster and other building residues.
It’s worth noting that not every adhesive residue is suitable for mechanical removal. Some require specialist assessment and alternative removal methods, particularly where older adhesives could contain hazardous materials.
The aim is to create a clean, sound and suitably prepared substrate, giving the products we’re using the best possible chance of bonding correctly.
This work is carried out before applying any primers or DPM. It also helps expose the substrate for more reliable moisture testing.
We’ve attended plenty of site surveys where we’ve found floors that have failed because essential preparation steps like these have been skipped.
It’s easy to overlook the work that goes underneath your new flooring, especially when you’ll never see it once the job is finished.
But poor preparation can lead to bonding failures, problems with smoothing compounds and potentially expensive repairs further down the line.
The preparation is just as important as the finished floor.
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