What’s the Best Thing to Seal Masonry Block for Water?

When it comes to sealing masonry blocks for water protection, the choice of the right sealer plays a crucial role in ensuring long-lasting and effective results. Among the various options available, a silane/siloxane-based sealer emerges as the superior choice. Unlike conventional sealers, this specialized sealer is specifically formulated to address the porous nature of masonry materials. By utilizing a unique blend of large and small particles, this sealer offers improved penetration into the surface of concrete blocks. Once applied, it undergoes a chemical reaction beneath the substrate, resulting in the formation of a robust water-repellent barrier.

What Is the Best Way to Waterproof a Cinder Block Wall?

First, it’s important to prepare the cinder block wall by cleaning any dirt or debris that may be present on the surface. This ensures that the waterproofing material will properly adhere to the wall.

After cleaning, the next step is to apply an air and moisture barrier. Fluid-applied air barriers are highly recommended for sealing cinder block walls due to the presence of wire ties that often protrude from the wall. These barriers create a continuous, seamless membrane over the surface, preventing any air or moisture infiltration. They’re typically sprayed or rolled onto the wall and then cured to form a durable, flexible barrier.

Another option for waterproofing a cinder block wall is to use a waterproofing paint or coating. These products are specifically designed to create a waterproof barrier on masonry surfaces such as cinder blocks. They can be applied with a brush or a roller and provide a protective seal against water penetration. However, it’s important to note that these paints or coatings may not be as effective as a fluid-applied air barrier in sealing the wire ties.

Siloxa-Tek 8500 is a highly advanced and environmentally friendly concrete sealer that offers unbeatable protection for concrete block walls. It’s innovative formula provides long-lasting durability, preventing water damage, stains, and other forms of deterioration. Additionally, Siloxa-Tek 8500 is extremely easy to apply, saving you time and effort. If you want the best sealer for your concrete block walls, look no further than Siloxa-Tek 8500.

What Is the Best Sealer for Concrete Block Walls?

This sealer is specifically formulated to provide long-lasting protection for concrete block walls against water, damaging freeze-thaw cycles, and the effects of weathering. It’s advanced penetrating technology allows it to deeply penetrate the pores of the concrete, creating a strong and durable barrier that’s resistant to water and other external elements.

One of the key advantages of Siloxa-Tek 8500 is it’s eco-friendly formulation. It’s water-based, low VOC (volatile organic compound), and doesn’t contain any harmful chemicals or solvents that can harm the environment or pose health risks to individuals working with it. This makes it an ideal choice for both commercial and residential applications where sustainability and environmental responsibility are important factors.

In addition to it’s environmental benefits, Siloxa-Tek 8500 is also incredibly easy to apply. It can be sprayed, rolled, or brushed onto the concrete block walls, and it dries quickly, allowing for a fast and hassle-free application process. This saves both time and effort during the sealing process, making it a favorite among contractors and DIY enthusiasts alike.

Furthermore, the sealer creates an attractive satin finish that enhances the natural beauty of the concrete block walls. It doesn’t leave a glossy or artificial-looking sheen, making it a popular choice for homeowners who want to maintain a natural and rustic appearance for their outdoor or indoor concrete block walls.

Benefits of Using a Sealer on Concrete Block Walls

  • Enhances the appearance of the concrete block walls
  • Prevents water infiltration and moisture damage
  • Reduces efflorescence and the formation of salt deposits
  • Minimizes the growth of mold, mildew, and algae
  • Improves the structural integrity and durability of the walls
  • Increases resistance to stains, dirt, and oil penetration
  • Facilitates easier cleaning and maintenance of the walls
  • Protects against freeze-thaw damage and cracking
  • Extends the lifespan of the concrete block walls
  • Adds value to the property

Source: Concrete Block Sealer > Articles > GhostshieldĀ®

Applying surface sealants is essential for effectively waterproofing a block foundation. By preventing water penetration and subsequent damage, these exterior wall treatments create a barrier that keeps water from entering the concrete blocks. Ensuring the foundation remains protected, surface sealants play a crucial role in maintaining the integrity of the block foundation.

Can You Waterproof a Block Foundation?

This can be achieved by applying a waterproofing membrane or coating directly onto the exterior surface of the foundation wall. The waterproofing material creates a barrier that prevents water from seeping into the blocks and causing damage. It’s important to note that surface sealants alone aren’t sufficient to fully waterproof a block foundation. Proper drainage systems, such as French drains or waterproofing membranes, should also be installed to redirect water away from the foundation.

Additionally, it’s crucial to address any existing cracks or gaps in the foundation wall before applying the surface sealant. These openings can provide an entry point for water, compromising the effectiveness of the waterproofing. Professional inspection and repair of any existing damage is crucial to ensure the long-term integrity of the foundation.

The type of surface sealant or waterproofing material used will depend on various factors, such as the climate and groundwater conditions in the area. It’s recommended to consult with a waterproofing expert or contractor to determine the most suitable solution for your specific needs. They’ll be able to assess the condition of the foundation, identify any potential vulnerabilities, and recommend appropriate waterproofing techniques.

By taking the necessary steps to waterproof your block foundation, you can ensure the long-term stability and durability of your home.

How to Choose a Waterproofing Expert or Contractor for Your Block Foundation

  • Research different waterproofing experts or contractors in your area
  • Check their credentials and experience in waterproofing block foundations
  • Read reviews and testimonials from previous clients
  • Inquire about the materials and techniques they use for waterproofing
  • Ask for a detailed estimate of the cost and timeframe for the project
  • Request references from past customers and contact them for feedback
  • Ensure the expert or contractor is fully licensed and insured
  • Discuss any specific concerns or issues you’ve with your block foundation
  • Compare quotes and proposals from multiple experts or contractors
  • Choose the waterproofing expert or contractor that best meets your requirements and offers competitive pricing
  • Sign a contract outlining the scope of work, materials, cost, and timeline
  • Make sure to communicate regularly with the expert or contractor during the project
  • Inspect the completed work and address any final details or touch-ups if necessary
  • Ask for warranties or guarantees on the waterproofing work performed
  • Maintain regular maintenance and inspections of your block foundation to prevent future issues

To fully seal cinder block walls and effectively prevent water damage and efflorescence, you can use RadonSeal Plus + Ion-Bond Armor. This advanced solution acts as a waterproofing agent, while also strengthening the foundation walls and maintaining their appearance. RadonSeal is a water-based, clear, non-film forming sealer that permeates deep into the concrete, sealing the pores and capillaries that cause porosity. This comprehensive approach ensures long-lasting protection against moisture, water vapor, and other potential issues.

What Do You Seal Cinder Block Walls With?

To seal cinder block walls effectively, you can use RadonSeal Plus + Ion-Bond Armor. This combination works wonders in waterproofing, strengthening, and preserving the overall appearance of your cinder block foundation walls. The RadonSeal product is specifically designed to permanently seal the blocks against moisture, water vapor, and efflorescence.

RadonSeal is a water-based and zero VOC concrete sealer, making it a safe and environmentally friendly option. It utilizes nano-chemical technology to penetrate deep into the surface of the concrete, effectively sealing the pores, capillaries, fractures, and air voids that contribute to the porosity of the material.

In addition to it’s sealing capabilities, RadonSeal also helps mitigate radon gas. This is particularly important if you live in an area with high radon levels, as the gas can seep through porous materials like cinder blocks. By using RadonSeal, you can address both the waterproofing and radon mitigation needs of your cinder block walls.

To achieve maximum protection, it’s recommended to use RadonSeal Plus + Ion-Bond Armor together. Ion-Bond Armor is a topcoat that adds an extra layer of protection to the sealed cinder block walls. It further enhances the durability and resistance to water, helping the walls stay in excellent condition for years to come.

By using this combination, you can permanently protect your foundation walls against moisture, water vapor, efflorescence, and radon gas.

Waterproofing a below-grade concrete block foundation is crucial in preventing moisture intrusion and potential damage. By utilizing a waterproofing membrane that effectively tackles the limitations of a concrete block foundation, you can ensure long-term protection. In this article, we will delve into the materials that can be used and the protocols for waterproofing, enabling you to efficiently waterproof cinder blocks.

Can You Waterproof Cinder Blocks?

When it comes to waterproofing cinder blocks, there are effective methods available that can address the limitations of a concrete block foundation. One such method involves using a waterproofing membrane. This membrane acts as a barrier to prevent moisture intrusion and protect the foundation from water damage.

This membrane is typically made up of a blend of elastomeric polymers that can withstand the movement and stresses associated with concrete block foundations.

Furthermore, it’s important to consider drainage when waterproofing cinder blocks. Installing a foundation drainage system can help to alleviate water pressure and prevent moisture build-up around the foundation. This can be achieved through the installation of perforated pipes, gravel, and drainage mats that direct water away from the foundation.


In conclusion, when considering the best solution for sealing masonry blocks against water, it’s crucial to opt for a silane/siloxane-based sealer.

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