How to Prepare Your Garage for Epoxy Coating

How to Prepare Your Garage for Epoxy Coating

Getting your garage ready for a professional epoxy flooring installation involves both homeowner preparation and professional preparation. Some steps you handle before we arrive, and others are part of our installation process. At Brooks & Company Epoxy, we walk every homeowner through this process so there are no surprises on installation day.

Here is the complete preparation guide for homeowners across Oakland, San Francisco, San Jose, Berkeley, Fremont, Hayward, and the greater Bay Area.

What Homeowners Do Before Installation Day

1. Clear Out the Garage Completely

This is the most important thing you can do before we arrive. The garage needs to be completely empty. Every item needs to come out, including:

• Vehicles
• Shelving and storage racks (freestanding units that can be moved)
• Tools, workbenches, and equipment
• Boxes, bins, and stored items
• Trash cans, recycling bins
• Bicycles, sports equipment, lawn equipment

We need full, unobstructed access to the entire floor surface. Items left in the garage slow down the process and can prevent us from coating the full area.

Planning tip: Most homeowners need two to four hours to clear a standard garage. If you have heavy items or a lot of storage, plan a full day. Consider temporarily storing items in a side yard, driveway, spare room, or a rented storage pod.

2. Disconnect or Move Appliances

If your garage has a washer, dryer, water heater, or extra refrigerator, these need to be disconnected and moved out of the space. If an appliance is hardwired or permanently plumbed and cannot be moved, let us know during your estimate so we can plan around it.

3. Clean Up Oil and Chemical Spills

If your garage floor has significant oil stains or chemical spills, give them a preliminary cleaning before we arrive. You do not need to get them perfectly clean since our diamond grinding process handles surface contamination. But removing standing oil or thick buildup saves time and helps us work more efficiently.

A degreaser from your local hardware store and a stiff brush will handle most garage spills. Rinse thoroughly and allow the floor to dry.

4. Address Any Water Intrusion Issues

If water enters your garage during rain, whether from the driveway, under the door, or through cracks in the walls, let us know. We need to understand the moisture situation before we install. In some cases, addressing water intrusion with a new garage door seal, improved drainage, or grading corrections should happen before epoxy installation.

This is especially relevant during the Bay Area rainy season from November through March. Read our winter epoxy installation guide for seasonal considerations.

5. Plan for Vehicle Storage

Your vehicles cannot park in the garage for at least 72 hours after installation, which is the standard vehicle cure time. Plan to park on the street, in the driveway, or at a neighbor's during this period. Foot traffic is allowed after 24 hours, but vehicles must wait the full 72 hours.

6. Inform Your Household

Our installation process generates noise from diamond grinding and dust from preparation. While we use dust-collection equipment, some noise and fine dust are unavoidable. Let household members know about the timeline and keep pets and children away from the garage during the work.

What Our Team Handles on Installation Day

1. Full Inspection and Assessment

Before we start any preparation work, we inspect the entire concrete surface. We are looking for:

• Cracks and joints: We assess every crack to determine whether it is cosmetic or structural, static or active. Each type requires different treatment.
• Existing coatings: If there is old paint, sealer, or a previous epoxy application, we assess its adhesion and plan for removal. See our article on epoxy over existing paint for details.
• Surface damage: Spalling, pitting, and other concrete deterioration that needs repair before coating.
• Slope and drainage: We check that the floor slopes correctly toward the garage door for drainage.

2. Moisture Testing

Before every installation, regardless of season, we perform a calcium chloride moisture vapor transmission test. This measures how much moisture is migrating through the concrete slab from the soil beneath.

Why does this matter? Epoxy creates a vapor-impermeable barrier on the concrete surface. If moisture is rising through the slab at an excessive rate, it can push against the underside of the epoxy and cause delamination, which means the coating lifts off the concrete.

Acceptable moisture vapor emission rates for epoxy application are typically below 3 to 5 pounds per 1,000 square feet per 24 hours. If your slab tests above this threshold, we discuss mitigation options, including moisture-mitigating primers or recommending that you wait for drier conditions.

3. Crack and Joint Repair

Concrete cracks are inevitable. The question is how to handle them properly before coating. Here is our approach:

Hairline cracks (less than 1/16 inch): These are filled by the epoxy itself during application. No special treatment needed.

Small to medium cracks (1/16 to 1/4 inch): We fill these with a flexible polyurea joint filler that bonds to both sides of the crack and remains slightly flexible to accommodate minor concrete movement.

Large cracks (over 1/4 inch): These may require routing, which means widening the crack to create a clean channel, and then filling with polyurea filler. Large cracks sometimes indicate structural issues that should be evaluated.

Control joints (saw cuts): The straight-line joints cut into the concrete during original construction are filled with flexible filler and coated over. The joint lines may remain faintly visible through the epoxy, which is normal.

Expansion joints: Joints designed to allow significant concrete movement, typically at the garage-to-house transition, are NOT filled. These joints must remain functional. We coat up to the joint edge.

4. Diamond Grinding

This is the most critical step in the entire process and the main reason professional epoxy outlasts DIY by a factor of five to ten. Diamond grinding uses industrial floor grinding equipment fitted with diamond-segmented tooling to mechanically profile the concrete surface.

The grinder creates a concrete surface profile of CSP 2 to 3, which means the surface has consistent microscopic texture that provides an ideal bonding surface for epoxy. Think of it as creating millions of tiny peaks and valleys that the liquid epoxy flows into and grips.

Diamond grinding also removes:

• All existing coatings, sealers, and paint
• Surface contaminants including oil and chemical stains
• Laitance, which is the weak surface layer on concrete
• Trowel marks and surface irregularities

Our grinding equipment includes vacuum dust-collection systems to minimize airborne dust, though some fine dust is unavoidable. This is why we recommend keeping interior doors to the house closed during preparation.

For a detailed comparison of diamond grinding versus DIY acid etching, read our article on DIY vs professional garage epoxy.

5. Final Cleaning

After grinding, we thoroughly vacuum and clean the entire surface to remove all dust and debris. The concrete must be completely clean before epoxy application. Even a thin layer of grinding dust can compromise adhesion.

6. Epoxy Application

With the surface properly prepared, we apply the coating system:

1. Epoxy base coat: 100 percent solids commercial-grade epoxy applied at the proper thickness.
2. Decorative finish: Flake broadcast, quartz broadcast, or left as a solid color depending on your choice. See our color and flake guide for options.
3. Polyaspartic topcoat: UV-stable clear coat with optional anti-slip aggregate for traction and protection.

The Complete Timeline

Here is what to expect from start to finish:

Phase	Timeline
Homeowner clears garage	1 to 2 days before installation
Professional preparation (inspection, grinding, repairs)	Morning of Day 1
Epoxy base coat and flake broadcast	Afternoon of Day 1
Topcoat application	Day 2 (morning)
Light foot traffic allowed	24 hours after topcoat
Vehicle parking allowed	72 hours after topcoat
Full chemical resistance cure	7 days

Total time from empty garage to driving your car back in: approximately 4 to 5 days.

Pricing

Professional preparation including diamond grinding, crack repair, and moisture testing is included in our standard pricing:

• One-Car Garage: $2,800 total ($1,400 deposit)
• Two-Car Garage: $4,000 total ($2,000 deposit)

We also offer metallic flooring at $10 per square foot with a 50% deposit and countertop epoxy from $1,000 to $2,500 with a $500 flat deposit.

Ready to Get Started?

Preparing your garage for epoxy is straightforward when you know what to expect. Clear the space, let us handle the technical preparation, and within a few days you will have a garage floor that looks incredible and lasts 15 or more years.

Get a free estimate from Brooks & Company Epoxy. We serve Oakland, San Francisco, San Jose, Berkeley, Fremont, Hayward, and all Bay Area cities. Call us at (510) 435-2634.