The shift toward sustainable construction has brought Type 1L cement (Portland Limestone Cement) into the spotlight. While it reduces carbon emissions, it also introduces new challenges for contractors, finishers, and property owners.
At Metropolitan Materials, we’re helping customers navigate these changes with the right products, processes, and expertise.
Type 1L concrete replaces a portion of traditional Portland cement with limestone, lowering environmental impact. However, these changes affect how concrete behaves during placement, finishing, and curing.
Contractors are seeing noticeable differences, including:
These factors make proper curing and protection more critical than ever.
One of the most common complaints with Type 1L concrete is surface scaling and popping.
Scaling occurs when the surface layer of concrete begins to:
This often starts small but can quickly expand into widespread surface failure.
Scaling and surface defects are typically caused by:
When moisture enters unprotected concrete and freezes, it expands—causing the surface to “pop” or break apart.
With Type 1L, increased porosity and finishing challenges can make these issues more pronounced.
Many surface issues trace back to one key step: curing.
Concrete needs to retain moisture during hydration to develop strength and durability. Without proper curing:
Curing compounds help regulate moisture and prevent premature drying—especially important with Type 1L mixes.
The most effective way to protect concrete—especially Type 1L—is using cure & seal products.
Cure & seal products combine two critical functions:
1. Curing
2. Sealing
These products can be applied early—often as soon as the surface can be walked on—and provide both immediate and long-term protection.
At Metropolitan Materials, we recommend high-performance cure & seal systems designed for today’s concrete challenges:
Modern products combine curing, sealing, and waterproofing in one application—saving time while improving durability.
These advanced formulations:
To avoid costly failures, follow these key steps:
Type 1L concrete is here to stay—but it requires a smarter approach.
Without proper curing and sealing, surfaces are more vulnerable to:
With the right products and expertise, you can maximize durability, protect your investment, and deliver better long-term performance.
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