Removing old epoxy from a concrete floor safely means grinding or chemically stripping the coating down to bare, sound concrete, then cleaning every trace of residue before you recoat. You cannot safely paint over failing epoxy - it will peel off the new layer within one or two seasons. The rest of this post walks through the two removal methods, the dust and chemical controls that keep you out of the hospital, what the job costs in Richmond in 2026, and the mistakes that ruin slabs.
Epoxy floor removal is the process of stripping a cured resin coating off a concrete slab, either by mechanical abrasion or by chemical softening, so the surface can be recoated or left bare. It is needed the moment you see peeling, hot-tire lift, or bubbling - all of which are common on Richmond slabs that sit close to the water table.
Why old epoxy has to come off before anything new goes down
Old epoxy fails because moisture vapor pushes up through the slab and shears the bond between the resin and the concrete. Richmond is built on a lot of low-lying, high-water-table ground - Steveston, Hamilton, and the older parts of Richmond Centre all sit on fill that stays damp year-round. That vapor has to go somewhere, and if it cannot escape through the slab, it lifts the coating instead.
You can spot the difference between a cosmetic scuff and a structural failure in about ten seconds. Take a 4-inch putty knife and try to lift a loose edge. If the epoxy pops off in a sheet and leaves a clean, grey slab underneath, the bond is gone and the whole floor has to come up. If it just chips at the edge, you may only need a spot repair.
Three signs mean full removal, not patching:
- Hot-tire lift - the coating pulls away in the shape of car tires, usually within two summers of installation.
- Widespread bubbling - blisters bigger than a loonie across more than 10 percent of the floor.
- Peeling at control joints - the epoxy curling along the saw cuts, which is where vapor pressure concentrates.
If you are recoating a garage, you are also going to want to know what a fresh Garage Floor Epoxy Coating in Richmond, British Columbia (BC) involves before you commit to stripping the slab yourself. The prep is nearly identical, and the coating is the easy part.
How do you remove epoxy from a concrete floor?
You remove epoxy from a concrete floor by running a diamond grinder over the slab with a dust shroud and HEPA vacuum, or by applying a methylene chloride or soy-based stripper, letting it dwell, and scraping the softened resin into sealed containers. Grinding is faster and leaves a better bonding profile; chemical stripping is quieter and works in tight corners where a grinder will not fit.
For most Richmond garages and basements between 400 and 800 square feet, a two-person crew with a 7-inch grinder and a ride-on unit for the open floor can strip a failed coating in four to six hours. Chemical stripping on the same slab takes two days because of the dwell time and the cleanup.
Here is the mechanical method we use, step by step:
- Seal the room with 6-mil poly and tape off any furnace, HRV, or dryer vent.
- Run a 30-grit diamond segment on a grinder with a dust shroud hooked to a HEPA vac rated for silica.
- Overlap each pass by 50 percent so you do not leave strips of old coating behind.
- Check for remaining epoxy with a spray bottle of water - dry spots are still coated.
- Vacuum the slab twice, then wipe with a damp microfiber to catch the fines.
Chemical stripping follows the same containment rules but adds PPE: nitrile gloves, a full-face respirator with organic vapor cartridges, and eye protection. Methylene chloride is the aggressive option and it is nasty - it will burn exposed skin and it off-gasses hard. Soy-based strippers are slower but far safer indoors, which matters when you are working in a finished basement.
Once the coating is off, the slab usually needs some love. Hairline cracks that were hidden under the epoxy open up, and we fill them with a rigid epoxy before anything else goes down - the same process we cover in Concrete Crack Repair in Richmond, British Columbia (BC).
Grinding vs chemical stripping: which one fits your slab
Grinding wins on any slab you can reach with a machine, and chemical stripping wins in corners, stairwells, and rooms where the dust or noise would get you evicted. There is no universal answer - it depends on square footage, ceiling height, and how much of the coating has already failed.
Use this as a rough guide:
- Under 200 sq ft, tight access: chemical stripper and hand scrapers.
- 200-1,500 sq ft, open floor: diamond grinding with dust control.
- Over 1,500 sq ft: ride-on grinder, two operators, one full day.
- Slab with moisture issues: grind, then test with a calcium chloride kit before you recoat.
Diamond grinding also gives you something chemical stripping does not: a concrete surface profile. The Concrete Surface Profile scale runs from CSP 1 (nearly smooth) to CSP 9 (deeply scarified). Most epoxy manufacturers want CSP 2 to CSP 3 for a garage and CSP 3 to CSP 4 for a commercial floor. A grinder with the right grit hits that profile in one pass. A stripped floor usually needs a separate grind anyway to open the pores.
That is why, in practice, chemical stripping is a corner-and-edge tool and grinding is the main event. If you are doing a full Epoxy Floor Resurfacing in Richmond, British Columbia (BC), the removal and the profile are handled in the same visit.
The safety rules that actually matter
Silica dust and methylene chloride are the two hazards that send people to the ER on epoxy removal jobs, and both are entirely preventable with the right respirator and a sealed work zone. Crystalline silica is in every concrete slab; grinding without a shroud and HEPA vac puts it straight into the air you are breathing.
What you need on hand:
- Respirator: NIOSH-approved N95 at minimum for short grinding passes; P100 or a PAPR for anything over 15 minutes.
- Chemical cartridge: organic vapor cartridges for solvent-based strippers, changed every 8 hours of use.
- Eye protection: sealed goggles, not safety glasses - dust and stripper both find the gap.
- Gloves: nitrile for strippers, cut-resistant for scraper work.
- Ventilation: box fan in a window pulling air out, plus a second fan pushing fresh air in.
Two more rules that get skipped. First, never mix stripper brands - the chemistry can react and produce chlorine gas. Second, keep a 5-gallon bucket of clean water and a hose within arm's reach of any chemical work. If stripper hits skin, you have about 15 seconds before it starts to burn.
Dispose of stripped resin and contaminated rags as household hazardous waste. In Richmond, that means a trip to the depot on Lynas Lane, not the curbside bin. A 400 sq ft garage typically produces two to three 20-litre pails of waste.
What does epoxy removal cost in Richmond in 2026?
Typical 2026 pricing in this area runs $2.50 to $4.50 per square foot for professional epoxy removal, including disposal, with most single-car garages landing between $700 and $1,400. Chemical-only removal in tight spaces runs 20 to 30 percent higher because of the labour.
Here is how the numbers break down for a typical Richmond job:
- Single-car garage (240 sq ft): $700-$1,100.
- Double garage (440 sq ft): $1,100-$1,900.
- Basement (600 sq ft): $1,500-$2,600.
- Commercial or warehouse (2,000+ sq ft): $2.00-$3.50 per sq ft.
DIY costs are lower on paper but not by as much as people think. A 7-inch grinder rental runs $90 to $130 per day in Metro Vancouver, diamond cup wheels are $80 to $150 each, a HEPA vac is $70 to $110 per day, and stripper is $60 to $120 per 5-gallon pail. Add disposal fees and PPE, and a double garage DIY job lands around $500 to $800 - before you account for your weekend.
If the slab has moisture problems, removal is only half the story. A failed coating on a damp slab will fail again unless you address the vapor, which is why we test every floor before quoting a recoat.
Common mistakes we see on DIY epoxy removal jobs
The single most common mistake is stopping too early - leaving 5 to 10 percent of the old coating in place and hoping the new epoxy will cover it. It will not. New epoxy bonds to concrete, not to old epoxy, and any remaining patch becomes a release layer.
Other repeat offenders:
- Grinding without a shroud. You coat the entire house in silica dust and void your shop vac's warranty in one afternoon.
- Skipping the moisture test. Recoating a damp slab is the fastest way to repeat the same failure in 18 months.
- Using a wire wheel on a drill. It polishes the concrete instead of profiling it, and the new epoxy will not stick.
- Not neutralizing chemical stripper. Residual stripper kills the bond of the next coating.
- Pouring stripper sludge down the drain. It is hazardous waste, and it is illegal to put it in the storm sewer.
One more: people grind wet to control dust, then coat the slab the same day. Wet grinding leaves a slurry that soaks into the pores. The slab needs 24 to 48 hours to dry before any coating goes on, and in a Richmond basement in October, that can stretch to 72 hours.
When to call a professional
Call a professional when the slab is over 400 square feet, when the coating is failing across the whole floor rather than at the edges, or when the room has no way to vent grinding dust and solvent fumes. Those three conditions cover about 80 percent of the removal jobs we quote in Richmond.
We handle the containment, the HEPA grinding, the moisture testing, and the disposal in one visit. Our team also checks the slab for cracks and weak spots while the floor is bare, so you are not paying twice to fix something that was hidden under the old coating. If your floor is in a commercial space - a shop, a restaurant back-of-house, or a warehouse aisle - we schedule the work around your operating hours so you do not lose a day of business.
Homeowners across Richmond call us after a DIY attempt goes sideways, and that is fine. We would rather fix it once than watch you strip the same slab twice.
Frequently Asked Questions
Can I just epoxy over old epoxy?
No. New epoxy will not bond to a cured, failing coating - it will peel within one to two seasons. You have to grind or strip back to bare concrete first. The only exception is a fully intact, well-bonded floor, and even then you need to scarify the surface before recoating.
How long does epoxy removal take?
A 400 sq ft garage takes four to six hours with a two-person grinding crew, including cleanup. Chemical stripping on the same slab takes two days because of dwell time. Add 24 to 48 hours of drying before any new coating goes down.
Is epoxy removal dusty?
Grinding is dusty, but a shroud and HEPA vacuum capture over 95 percent of the silica at the source. Chemical stripping produces almost no dust but releases solvent vapor, so ventilation matters more than filtration. Either way, wear a respirator.
Can I remove epoxy with a pressure washer?
No. A pressure washer at 3,000 to 4,000 PSI will etch the concrete and drive water into the slab without lifting a well-bonded coating. It also creates a slip hazard and a mess that takes longer to clean than the removal itself.
How do I know if the old epoxy is actually failing?
Try to lift a loose edge with a 4-inch putty knife. If it pops off in a sheet and leaves clean grey concrete, the bond is gone. Bubbling over 10 percent of the floor, or hot-tire lift, also means full removal.
Get help with Epoxy Flooring in Richmond
If your slab is peeling, bubbling, or lifting under the tires, we can strip it back to sound concrete and prep it properly for whatever goes down next. We work across Richmond, from Steveston to Hamilton to the industrial parks along Viking Way.
Call Richmond Elite Epoxy Flooring at +7742316666 for a removal quote - we will tell you straight whether the floor needs a full strip or just a spot repair.