Epoxy Floor Thickness: Broadcast vs Troweled Systems Explained

Introduction

"How thick should my epoxy floor be?"

It is one of the most common questions in epoxy flooring - and one of the most misunderstood.

Thickness alone does not determine durability. A floor described as "thick" can still fail if it is not built as a system. Conversely, a properly designed broadcast system with moderate thickness can outperform a much heavier resin-only application. It can also outperform heavily filler-loaded thicker systems.

Understanding how epoxy floor thickness is created - and how it performs - is more important than simply targeting a number of mils.

Coatings vs Reinforced Systems

A single coat applied at 10 to 20 mils is still fundamentally a coating. A broadcast system builds thickness differently. It uses aggregate reinforcement within the resin matrix to create structure, not just film build.

We typically recommend a minimum coating system of:

• A primer
• Two coats of 100% solids epoxy
• Each applied at approximately 8 to 10 mils
• Inclusion of anti-skid aggregate when appropriate

At this thickness, a coating system performs best when the primary wear mechanism is abrasion.

The advantage of a thicker reinforced broadcast system is increased resistance to impact.

Thickness should match the type of abuse the floor will receive.

The Broadcast Method: How Thickness Is Built

The broadcast method builds thickness in measurable increments.

A properly installed full broadcast layer typically produces approximately 1/16 inch (about 60 to 70 mils) of finished system build once sealed.

This includes:

• Resin application
• Full aggregate broadcast
• Removal of excess aggregate
• Lock coat and/or topcoat

Thickness scales predictably:

• 1 broadcast approximately equals 1/16 inch
• 2 broadcasts approximately equals 1/8 inch
• 3 broadcasts approximately equals 3/16 inch
• Each additional broadcast layer increases finished thickness by approximately 1/16 inch

There is no fixed maximum thickness using the broadcast method. The system can be engineered in layered increments to meet the structural and impact demands of the environment.

This allows thickness to be engineered intentionally rather than estimated.

Important Clarification: Quartz vs Chip Systems

When discussing double broadcast systems, we are typically referring to quartz or sand broadcast floors designed for heavy industrial environments.

Chip flooring systems are different.

A single broadcast of decorative chip, properly sealed, often performs very well in applications where chip flooring is the appropriate system.

This is not because it is "lighter duty." It is because chip systems perform differently.

Compared to quartz broadcast floors:

• Chip systems offer slightly more flexibility
• They distribute certain types of impact differently
• The wear layer is primarily the topcoat, not exposed aggregate

In environments such as:

• Commercial kitchens
• Restaurants
• Bathrooms
• Offices
• Water processing facilities

where dropped items are common but typically involve broader surface impact rather than sharp concentrated blows, a properly installed single-broadcast chip floor is often more than adequate.

Why Chip Systems Often Use Double Topcoats

Part of how chip flooring compensates for not using a double broadcast layer is through the topcoat strategy.

In applications like commercial kitchens and similar environments, most long-term wear is abrasion - foot traffic, carts, and cleaning equipment.

By installing two topcoats over the chip broadcast:

• Abrasion resistance is significantly increased
• The wear surface thickness is effectively doubled
• Service life before visible wear-through is extended

In practice, it is uncommon to see properly installed double-topcoated chip floors worn through in bathrooms, kitchens, or office environments.

The performance model is different:

Quartz double broadcast equals structural reinforcement for impact.
Chip with double topcoat equals abrasion resistance strategy.

Both are engineered responses to different wear mechanisms.

Where Double Broadcast Quartz Is Recommended

Double broadcast quartz systems become more important in environments where concentrated, sharp impact is likely.

Examples include:

• Automotive mechanic shops
• Machine shops
• Fabrication facilities
• Areas where steel parts are routinely dropped
• Locations where sharp metal edges contact the floor

In those environments, impacts are:

• Concentrated
• Often sharp-edged
• Metal-to-floor
• Repetitive

That is where the additional 1/16 inch structural increment of a second broadcast layer provides measurable benefit.

Broadcast vs Troweled Systems

Troweled epoxy systems can build thickness more quickly and are often selected for installation speed.

Each 1/16 inch broadcast layer can effectively add up to a day to the installation schedule due to cure time and preparation for the next layer.

For projects requiring heavy build in limited time, a troweled system can be efficient.

However, broadcast systems offer:

• More uniform finish control
• Greater forgiveness in application
• Consistent texture
• Reduced dependence on advanced finishing technique

In many cases, someone with moderate experience using the broadcast method can produce a more uniform and attractive result than an experienced installer attempting a troweled system under challenging conditions.

Thickness Is About Matching the Environment

Not every floor requires 1/8 inch. Some require more. In many cases, a 20 mil 100% solids coating may be sufficient.

It depends on:

• Product quality
• Chemical exposure
• Traffic type
• Impact type
• Installation skill
• Service expectations

The correct system is the one that matches the real-world use of the space.

When thickness is engineered as part of a complete system - not just selected by number - performance becomes predictable.

If you would like to review complete flooring system options, see our
Seamless Flooring Systems Overview.

Predictable performance is the goal.

Proper mixing and installation is critical to the optimal success of all products.  See Installation Tips, Techdata, & MSDS for more details on our products.  Be sure to contact us with any questions and/or concerns that you have.

For more information please contact:

Epoxy.com
A Division of Epoxy Systems, Inc
A Vermont Corporation
USA

We have products that have passed the test of time as well as the best new Systems available today.

Since 1980 - Over 45 years of the highest quality products

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321-206-1833  Customer Service - Ordering and Order Status
Katey Lambert-Fontaine - Vice President & Chief Operations Officer
katey@epoxy.com

352-533-2167  Technical Support
Norm Lambert - President & Technical Support Director
info@epoxy.com

Debby Lambert, Co-Founder and Strategic Planning

Website: www.epoxy.com

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