Average response time: under 24 hours
Concrete behaviour explains most of the problems seen on site. Use PCD diamond tooling on a floor abrading equipment to shave off glue layer and thinset mortar in passes, then a 30/46 metal-bond disc to clean the slab. After pulling up old tile, the thinset mortar, mastic and grout bed remaining on the concrete must be removed before new flooring.
For machine-matched tooling, browse our Diamond Trapezoid Grinding Disc (JOY-TP-R3) for Floo... range.Key points to understand.
This is where the concrete makes its own rules.
The background.
On a Husqvarna Redi-Lock plate, the Piranha PCD coating layer-stripping tool is built for this exact project.
Understanding the material explains the symptoms.
What this means on site.
A walk-behind scraper removes loose glue layer but leaves a thin bonded film and low spots.
The slab condition drives every decision after this point.
Key points to understand.
Do not dry-abrade — wet abrade or encapsulate, and have the material tested.
This is where the concrete makes its own rules.
The background.
Buildings before roughly 1980 may have asbestos-containing cutback mastic.
Understanding the material explains the symptoms.
What this means on site.
New glue layer requires a CSP 2-3 profile — a light concrete roughness, not a burnished floor.
The slab condition drives every decision after this point.
Key points to understand.
After abrading, wipe the floor with a white rag.
This is where the concrete makes its own rules.
The background.
Very thick mortar beds may require a scarifier (flail cutter) first, then a fine abrade.
Understanding the material explains the symptoms.
What this means on site.
The CSP 2-3 profile is ideal for most adhesives.
The slab condition drives every decision after this point.
Key points to understand.
Once the slab is clean, install the new flooring within 24 hours.
This is where the concrete makes its own rules.
The background.
A clean subfloor should feel uniformly coarse, never even or tacky.
Understanding the material explains the symptoms.
What this means on site.
After abrading, let the room air out and industrial vacuum twice before the flooring crew arrives.
The slab condition drives every decision after this point.
Key points to understand.
Do not skip corners — new flooring over old glue curls up within months.
This is where the concrete makes its own rules.
The background.
A clean subfloor is the foundation of every good flooring install.
Understanding the material explains the symptoms.
A: The practical answer is, Just enough to expose clean sound concrete — typically 0.3-1 mm. Do not dig into the slab.
A: For most jobs, Eventually, however it loads up slowly. PCD strips glue layer far faster and saves discs.
A: In short, It should show uniform concrete color with no glossy film. Wipe with a white rag — little black residue means clean.
A: The practical answer is, Yes. Floating LVT requires a level, clean slab; epoxy resin requires a CSP 2-3 profile.
Looking for the right tool? Check our Single Rhombus Segment Diamond Trapezoid Grinding Di.... Looking for the right tool? Check our Double Rhombus Segment Diamond Trapezoid Grinding Disc.Start from the concrete condition and the right approach becomes obvious. Old tile projects end with a subfloor prep day.
Written and reviewed by JOY TECH - an SGS & BV audited, CE/RoHS certified diamond tools manufacturer founded in 2004, exporting to 50+ countries.
Our factory and quality management system are audited by SGS and Bureau Veritas. Products meet CE/RoHS requirements and every piece is 100% inspected before packing.
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