29 Apr Guide to Crack Suppression Membranes for Terrazzo Floors
Guide to Crack Suppression Membranes for Terrazzo Floors
What is a crack suppression membrane for terrazzo? A crack suppression membrane is a flexible epoxy resin applied to a concrete substrate before pouring the epoxy terrazzo to prevent existing or future substrate cracks from transferring to the terrazzo topping. It’s a standard component of professional epoxy terrazzo installations.
Crack suppression membranes have emerged as a solution aimed at preserving terrazzo floors by preventing cracks from forming and spreading. This ensures the surface remains timeless and remarkably durable throughout the building’s lifespan. This comprehensive guide will examine crack suppression membranes, shedding light on their purpose, benefits, and installation methods.
Understanding Cracks in Terrazzo Floors
Despite efforts to prevent them, cracks can develop in well-installed terrazzo floors. While skilled installation techniques and proper joint maintenance can minimize cracks, their occurrence is not always avoidable. Terrazzo floors are celebrated for their resilience, and even when cracks do appear, experienced contractors can restore the floor at a fraction of the original installation cost. Occasionally, cracks arise for reasons that even experts can’t predict, similar to concrete cracks.
Primary causes of cracking:
- Concrete shrinkage
- Slab settling or structural movement
- Thermal expansion and contraction
- Floor heaving
As a standard practice in terrazzo installation, a crack-suppression membrane is applied over the slab to prevent any cracks in the substrate from transferring or appearing on the surface of the terrazzo.
Preventing Cracks in Terrazzo Floors
Several strategies can be employed to prevent cracks from forming in terrazzo floors:
- Assess Existing Substrate Cracks: Before installing terrazzo, examine any cracks in the substrate to understand their cause.
- Treat Substrate and Joints: Properly addressing substrate cracks and honouring joints is crucial to preventing cracks in terrazzo. Applying crack isolation membranes and reinforcing materials to substrate cracks can be effective.
- Use Divider Strips: Incorporating divider strips into the concrete joints of terrazzo floors can help prevent and repair cracks.
- Implement Control Joints: For projects involving slab-on-deck, control joints can be employed to accommodate movement and minimize cracks.
The cost of skipping cost suppression: Major crack repairs that occur later in the flooring lifecycle can be costly for the building owners. By applying a crack suppression membrane at the time of installation, it costs a fraction of the repair, but also eliminates labour disruptions, aesthetic damages, and liability exposure of visible floor tracks in high-traffic commercial spaces. Unaddressed cracks can create trip hazards, creating a liability risk for building owners and facility managers. A Concord Terrazzo Company representative can explain full coverage and isolated coverage, which we’ll address briefly in the upcoming sections.
Pictured: The product is commonly red, but can be a different color (Left). TERRAZZCO Floor Aid Flexible Membrane (In Red) Applied over Fiberglass Mesh (Right).
What Does a Crack Suppression Membrane Do?
A crack suppression membrane, also known as a flexible membrane, absorbs and redistributes stress caused by substrate movement so that stress does not affect the terrazzo topping. Applying these membranes to conspicuous cracks and joints proactively preserves the floor’s structural integrity and flawless appearance.
It addresses:
- Active cracks already present in the slab before installation
- Anticipated movement from thermal cycling
- Saw cuts and control joints in the substrate
- Areas prone to having heaving or differential settlement
Concord Terrazzo Company has a product TERRAZZCO Floor Aid Flexible Membrane 528, that acts as a crack suppression solution for epoxy terrazzo systems.
PRODUCT ALERT: TERRAZZCO Floor Aid Flexible Membrane 528
Concord Terrazzo Company offers TERRAZZCO Floor Aid Flexible Membrane 528, a 100% solids, VOC-free two-component epoxy resin. This solution is applied to concrete to prevent substrate cracks from transferring to the terrazzo topping. Terrazzo floors made using TERRAZZCO Brand Products boast durability and decorative appeal, resulting in reduced maintenance costs and long-lasting flooring solutions.
Contact Concord Terrazzo Company to order this material for your terrazzo projects.
Installing Crack Suppression Membranes in Terrazzo Flooring
The installation of crack suppression membranes takes place during surface preparation, prior to laying out the floor layout.
Process includes:
- Inspect the substrate – Identifying all existing cracks, control joints, and saw cuts
- Clean surface – Remove debris and ensure cracks are routed
- Fill with rigid epoxy – Fill active cracks with a rigid epoxy like TERRAZZCO EZPour Epoxy 158
- Apply Product – Apply Flexible Membrane 528 over cracks and joints. Embed with Fiberglass Mesh
- Allow to Cure – Allow product to fully cure before the terrazzo pour begins
Pictured: Rigid epoxy applied to fill cracks
Isolated Coverage vs Full Coverage
For commercial projects, installers may install either an isolated coverage or a full coverage suppression membrane.
Isolated Coverage
Isolated Coverage was applied to the membrane over specific cracks, control joints, saw cuts, and areas of known movements. This approach is used when the substrate is generally in sound condition with localized cracking.
Full Coverage
Full coverage applies the flexible membrane across the entire slab surface. This approach is used when the substrate has extensive cracking, the slab is aging (some renovations and historic buildings), or the project type. It provides maximum protection and is a lower-risk choice.
What are the Benefits of a Crack Suppression Membrane?
Let’s recap the benefits of a crack suppression membrane and why they are important to your project:
| Benefit | Details |
|---|---|
| Extends floor lifespan | Prevents crack propagation |
| Reduces Repair Costs | Avoids unwanted costs after install |
| Protects Aesthetics | Maintains seamless appearance |
| Reduces Liability | Eliminates trip hazards |
| Supports Sustainability | Extends functional life of the floor, with no replacements |
FAQS About Crack Suppression Membranes
Is a crack suppression membrane required for all terrazzo installations?
It is standard practice to include crack suppression membranes for epoxy terrazzo installations, particularly where existing cracks, control joints, or movement are present.
What is the difference between a crack suppression membrane and a crack isolation membrane?
The terms are used interchangeably in the industry. Both describe the process of adding an epoxy resin between the substrate and the topping material to decouple movement. TERRAZZCO Floor Aid Flexible Membrane 528 functions as both.
How long does a crack suppression membrane last?
A properly applied crack suppression membrane is a permanent part of the floor system. It does not degrade independently of the terrazzo topping and does not require replacement or maintenance.
Conclusion: Investing in the Longevity of Terrazzo Floors
In summary, crack suppression membranes play a vital role in preserving the beauty and durability of terrazzo floors. By preventing cracks from forming and spreading, these membranes contribute to the longevity, safety, and aesthetic appeal of terrazzo surfaces. Whether for residential renovations or commercial projects, considering crack suppression membranes is a prudent step toward ensuring that your investment in terrazzo flooring stands the test of time.
Contact Concord Terrazzo Company to learn more about TERRAZZCO® Floor Aid Flexible Membrane 528. View Product.