Explore SEMCO Liquid Membrane For CMU Wall Sealing and Waterproofing
Concrete Masonry Unit (CMU) walls are widely used in construction for their strength, durability, and cost-effectiveness. To protect CMU walls and extend their lifespan, it’s crucial to use a high-quality waterproofing system. Let’s Explore some industry standard options.

Published: by SEMCO FL
Explore SEMCO Liquid Membrane For CMU Wall Sealing and Waterproofing
Concrete Masonry Unit (CMU) walls are widely used in construction for their strength, durability, and cost-effectiveness. However, despite their benefits, CMU walls are porous and can absorb water, leading to moisture problems, mold growth, and structural damage. To protect CMU walls and extend their lifespan, it’s crucial to use a high-quality waterproofing system. This is where SEMCO Liquid Membrane comes in, offering a seamless, effective solution for CMU wall sealing and waterproofing.
What is a CMU Wall?
A CMU wall is made up of concrete masonry units, commonly known as concrete blocks. These walls are popular in both residential and commercial buildings because they provide excellent structural support. However, due to their porous nature, they require proper waterproofing to prevent water infiltration, which can cause deterioration over time.
The Importance of Waterproofing CMU Walls
Without proper waterproofing, CMU walls can absorb moisture, leading to a range of issues such as cracks, efflorescence (white salt deposits), and interior water damage. Traditional waterproofing methods like paints and sealers often fail over time as they can peel, crack, or wear off. A more reliable solution is SEMCO Liquid Membrane, which provides long-term waterproofing and protection against water penetration.
Why Choose SEMCO Liquid Membrane for CMU Wall Waterproofing?
SEMCO Liquid Membrane is a cutting-edge waterproofing solution designed to penetrate and bond with CMU walls, creating a durable and flexible barrier. Unlike conventional waterproofing products, SEMCO’s solution:- Forms a seamless, watertight layer that prevents water from seeping into the CMU structure.
- Adapts to temperature changes and structural shifts, reducing the risk of cracks and failures.
- It is highly breathable, allowing moisture from within the wall to escape while blocking external water intrusion.
- Works on both new and existing CMU wall structures, making it a versatile choice for various projects.
The Best Solution for CMU Wall Waterproofing
If you’re looking for an effective way to protect CMU walls from moisture damage, SEMCO Liquid Membrane is the ideal solution. With its advanced waterproofing technology, easy application, and long-term durability, SEMCO ensures that your CMU walls remain strong and resilient for years to come.
Compare Semco Liquid Membrane
Consider using Semco Liquid Membrane to seal and waterproof your CMU walls. If you’re a contractor this solution plus a few other are a certain choice.

Whether for new construction or renovation projects,
Choosing SEMCO Liquid Membrane means investing in superior protection for your CMU wall structures.
- In construction, a “CMU wall” refers to a wall built using Concrete Masonry Units (CMUs), which are standard-size, pre-made rectangular concrete blocks
- PRO TIP: Use SEMCO LIQUID MEMBRANE™ to waterproof CMU walls.
- CMU stands for Concrete Masonry Unit .
- These are standard-size, pre-made rectangular blocks used in construction.
- CMU walls are a common and cost-effective way to build walls for various applications, including foundations, load-bearing walls, and partitions.
- CMUs are known for their durability, strength, and versatility.
- They are also resistant to fire and impact damage.
- CMUs are a versatile building material that are used in a wide range of construction applications.
- CMUs are available in a variety of sizes, shapes, and colors.
- Some common sizes include 8″ x 8″ x 16″, 8″ x 4″ x 16″, and 12″ x 8″ x 16
Related Waterproofing Resources:
SEMCO Liquid Membrane
Bonus Tip: SEMCO Liquid Waterproofing Membrane comes in a variety of colors, allowing you to seamlessly blend waterproofing with aesthetics. Choose from classic options like black and white, or add a touch of personality with Cove Blue or Sandy Beige.

Key Benefits of Semco’s Liquid Membrane:
- Superior Waterproofing: Once cured, the liquid membrane forms a barrier that protects against water infiltration. This makes it perfect for marine environments and any application where moisture resistance is critical.
- Flexibility and Versatility: Unlike rigid plywood, Semco’s liquid membrane can be applied to various surfaces and shapes, offering more design flexibility. It adheres well to wood, concrete, metal, and other materials.
- Ease of Application: The liquid membrane can be easily applied with a brush, roller, or spray, allowing for a seamless finish even in hard-to-reach areas. This reduces labor costs and installation time compared to traditional plywood. Semco’s anti-fracture fabric can be used to bridge joints between panels of plywood when embedded between two coats of liquid membrane.
- Durability and Longevity: The cured membrane is highly resistant to UV rays, chemicals, and physical wear, ensuring long-lasting protection in harsh conditions.
- Cost-Effective: Where a regular sheet of ¾” plywood averages around $1.25/sq ft, marine grade plywood can often be as much as $4/sq ft. At a typical yield of 800 sq ft for a 5 gallon bucket the Liquid Membrane only adds about $.50/sq ft providing considerable savings.
How to Apply Semco Liquid Membrane
Applying Semco Liquid Membrane is straightforward and can be done by professional contractors or DIY enthusiasts with some experience in home improvement.
Here’s a step-by-step guide:
- Prepare the Surface: Ensure the surface is clean, dry, and free from any loose debris or contaminants.
- Apply the Membrane: Using a brush, roller, or sprayer, apply an even coat of Semco Liquid Membrane. Ensure all areas are covered, especially joints and corners. Joints may require an anti-fracture fabric, check the product documentation for more details.
- Allow the first coat to dry: This usually takes a few hours but can vary based on environmental conditions.
- Apply the second coat
- Inspect and Finish: Check the surface for any missed spots or thin areas and apply additional coats or touch-up if necessary.
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Since 1991
Concrete & Tile Resurfacing Solutions
SEMCO Florida, Innovation driven surface engineering company that specializes in developing surfacing products for floors, walls, pool decks and waterproofing.