20+ Years Experience

Specialist Concrete Repair

Waterproofing Your Concrete: Essential Steps and Products

Enquire Today For A Free No Obligation Quote

Waterproofing your concrete is an essential process to protect your structure from moisture damage and ensure its longevity. By applying appropriate techniques and products, you can effectively prevent water infiltration and potential issues like cracks, leaks, and mold growth. Waterproofing concrete involves several crucial steps that should be followed diligently. Here, we will explore the concept of waterproofing concrete, its importance, and the essential steps involved in the process. We will also discuss various types of waterproofing products available in the market and factors to consider when choosing the right product. We will highlight common mistakes to avoid during concrete waterproofing and provide insights into the cost associated with this crucial preventive measure.

Key takeaway:

  • Waterproofing Concrete preserves the integrity of structures and prevents damage caused by water infiltration. It is crucial to protect foundations, basements, and other concrete surfaces to extend their lifespan and prevent costly repairs.
  • Essential Steps for Waterproofing Concrete include surface preparation, crack and joint repair, application of waterproofing membrane, and proper curing and drying time. Each step is vital to ensure a fully waterproofed concrete surface.
  • Various Types of Waterproofing Products for Concrete are available, including liquid waterproofing membrane, cementitious waterproofing coatings, silane/siloxane water repellents, and bentonite waterproofing. Choosing the right product depends on factors such as surface condition, exposure to moisture, and desired waterproofing performance.

What is Waterproofing Concrete?

What is Waterproofing Concrete?

Waterproofing concrete involves applying specialised products to make it resistant to water penetration and damage. Active chemicals are used to create a waterproof layer that prevents water from seeping through. These chemicals can be in liquid form or as a powder mixed with water. Sealants are also important in waterproofing concrete as they fill in cracks or gaps to create a watertight seal. They can be either liquid or solid depending on the project’s requirements.

Waterproofing concrete not only prevents water penetration but also protects it from other types of damage such as mold and mildew growth. This is important for the longevity and durability of concrete structures. By using active chemicals, sealants, and other specialised products, concrete can be effectively protected from water damage, mold, and deterioration. Therefore, it is crucial to prioritise waterproofing when considering concrete projects to maintain the structure’s integrity and enhance its longevity.

Why is Waterproofing Concrete Important?

Waterproofing concrete is important for several reasons. It helps prevent water damage by sealing the porous material and preventing water from seeping in. This prevents structural damage, such as cracks, deterioration, and mold growth, and increases the lifespan and durability of the concrete.

Additionally, waterproofing concrete helps maintain its appearance by preventing unsightly stains and discoloration caused by water penetration. By applying a waterproofing coating or sealant, the concrete can stay clean and fresh for longer periods.

Another important reason to waterproof concrete is to protect any materials or items stored in or around concrete structures. Whether it’s a basement, garage, or storage area, water leaks can damage furniture, electronics, documents, and other valuable items. By creating a barrier with waterproofing, you can prevent water from entering the space and damaging your belongings.

Furthermore, waterproofing concrete can also improve energy efficiency. When water penetrates concrete walls, it increases humidity levels inside a building, requiring more energy to dehumidify the air. By keeping the concrete waterproofed, you can maintain lower humidity levels and reduce energy consumption for cooling and dehumidification.

Essential Steps for Waterproofing Concrete

Looking to protect your concrete from water damage? Let’s dive into the essential steps for waterproofing concrete. We’ll cover surface preparation, crack and joint repair, application of waterproofing membrane, and curing and drying time. Don’t let water seepage ruin your concrete structures. Let’s explore the key techniques and products to ensure your concrete remains durable and water-resistant.

1. Surface Preparation

Surface preparation is a crucial step in waterproofing concrete. It is important to properly prepare the surface to ensure effective adherence of waterproofing products and provide long-lasting protection. Here are the essential steps for surface preparation:

1. Clean the surface: Remove all dirt, dust, debris, and loose particles from the concrete surface. This can be done by sweeping, power washing, or using a vacuum cleaner.

2. Repair cracks and joints: Inspect the surface for any cracks or joints that need to be repaired. Use concrete crack fillers or sealants to fill in the gaps and ensure a smooth and even surface.

3. Remove any existing coatings: If there are any previous coatings or sealants on the concrete, they need to be removed before applying new waterproofing products. This can be done using chemical stripping agents or mechanical methods like sanding or grinding.

4. Etch the surface: Etching is essential to create a rough texture on the concrete that helps the waterproofing products bond better. Use an acid-based etching solution or mechanical methods like shot blasting or scarifying to etch the surface.

5. Patch any damaged areas: If there are any damaged or deteriorated areas on the concrete surface, patch them using appropriate repair materials. This ensures that the surface is even and provides a solid foundation for the waterproofing products.

6. Allow the surface to dry: After completing the surface preparation, give the concrete enough time to dry thoroughly. The drying time can vary depending on the weather conditions and the type of concrete.

By following these steps, you can ensure that your concrete surface is properly prepared for waterproofing. This will help the waterproofing products adhere effectively and provide reliable protection against water damage.

2. Crack and Joint Repair

Crack and joint repair in waterproofing concrete is essential to ensure the long-term integrity and durability of the structure. The following steps should be followed when repairing cracks and joints:

1. Identify the cracks and joints: Carefully inspect the concrete surface to locate all the cracks and joints that require repair. Cracks can be classified as either structural or non-structural, and this classification will determine the appropriate repair method.

2. Clean the cracks and joints: Use a wire brush or a high-pressure water jet to remove any loose debris or contaminants from the cracks and joints. It is crucial to have a clean and sound surface for the repair material to adhere properly.

3. Prepare the crack or joint: Depending on the size and depth of the crack or joint, it may be necessary to widen and deepen it using a chisel or grinder. This will create a suitable channel for the repair material to fill and bond effectively.

4. Select the appropriate repair material: Choose a suitable repair material based on the type of crack or joint and the environmental conditions it will be exposed to. Common repair materials include epoxy injections, polyurethane sealants, or cement-based mortars.

5. Apply the repair material: Follow the manufacturer’s instructions to mix and apply the repair material. Ensure that the crack or joint is completely filled, ensuring proper adhesion and coverage.

6. Smooth and finish the repair: Use a trowel or putty knife to smooth out the applied repair material, ensuring a seamless transition with the surrounding concrete surface. Allow the repaired area to cure according to the product’s specifications.

By following these steps, you can effectively repair cracks and joints in concrete, preventing moisture infiltration and maintaining the structural integrity of the concrete. Always consult with a professional if you encounter extensive cracking or structural damage in your concrete.

3. Application of Waterproofing Membrane

When it comes to waterproofing concrete, applying a waterproofing membrane is a crucial step in ensuring the longevity and durability of the structure. The following steps outline the application process:

1. Surface Preparation: Before applying the membrane, it is important to thoroughly clean the surface, removing any dirt, dust, or loose materials. This ensures proper adhesion of the membrane.

2. Crack and Joint Repair: Prior to applying the membrane, any cracks or joints in the concrete should be repaired. This prevents water from seeping through and causing damage.

Once the surface is prepared, apply the waterproofing membrane evenly and smoothly, ensuring complete coverage of the surface and any cracks or joints.

4. Curing and Drying Time: After applying the membrane, it is important to allow it to cure and dry properly. The drying time may vary depending on the type of membrane used, so it is important to follow the manufacturer’s instructions.

By following these steps, you can effectively apply a waterproofing membrane to your concrete structure, protecting it from water damage and increasing its lifespan. Remember to choose a high-quality waterproofing membrane that is suitable for your specific needs and consult with a professional if you are unsure about the application process.

4. Curing and Drying Time

Curing and Drying Time:

Proper curing and drying time is crucial to ensure the effectiveness of waterproofing concrete. The table below highlights the typical curing and drying time for different types of waterproofing products:

Type of Waterproofing Product Curing Time Drying Time
Liquid Waterproofing Membrane 24 hours 4-7 days
Cementitious Waterproofing Coatings 48-72 hours 7-14 days
Silane/Siloxane Water Repellent 4-8 hours 24-48 hours
Bentonite Waterproofing 48-72 hours 7-14 days

Please note that these curing and drying times are based on ideal conditions and may vary depending on factors such as temperature, humidity, and thickness of the waterproofing layer. It is important to follow the manufacturer’s instructions for the specific product being used.

During the curing period, it is essential to protect the treated surface from any water exposure or heavy traffic. This allows the waterproofing product to properly bond and form a protective barrier. Once the curing time has passed, the surface can be subjected to light foot traffic.

The drying time refers to the time required for the product to achieve its maximum performance and resistance to water penetration. It is important to allow sufficient drying time before exposing the waterproofed surface to water.

Pro-tip: To ensure the best results, it is recommended to consult with a professional waterproofing contractor or follow the guidelines provided by the product manufacturer regarding curing and drying time.

Types of Waterproofing Products for Concrete

When it comes to waterproofing your concrete, it is important to understand the various types of products that are available. In this section, we will explore different options for concrete waterproofing products, including liquid waterproofing membranes, cementitious coatings, silane/siloxane water repellents, and Bentonite waterproofing. Through this exploration, you will discover the distinct benefits and applications of each product, enabling you to make a well-informed choice for your concrete waterproofing needs. Prepare yourself to safeguard your concrete with the appropriate products!

1. Liquid Waterproofing Membrane

When it comes to waterproofing concrete, one important option to consider is the use of a liquid waterproofing membrane. Here are some key points to know about liquid waterproofing membranes for concrete:

  1. Easy Application: Liquid waterproofing membranes are applied as a liquid and then dry to form a seamless and flexible waterproof barrier.
  2. Excellent Adhesion: These membranes have strong adhesive properties, allowing them to bond tightly to the concrete surface and create a reliable waterproof layer.
  3. Seamless Protection: Due to their liquid nature, these membranes can easily cover complex shapes, corners, and cracks in the concrete, providing comprehensive protection against water intrusion.
  4. Good Durability: Liquid waterproofing membranes are designed to withstand long-term exposure to moisture, UV rays, and other environmental factors, ensuring long-lasting waterproofing performance.
  5. Versatile Applications: These membranes can be used on various concrete structures, including basement walls, foundation walls, roofs, and balconies.
  6. Compatibility: Liquid waterproofing membranes can be applied on both new and existing concrete surfaces, making them suitable for both construction projects and renovation.
  7. Wide Range of Products: There are different types of liquid waterproofing membranes available, such as acrylic-based, bitumen-based, or polyurethane-based options. The choice depends on factors like the specific application, desired durability, and budget.

So, when considering waterproofing options for your concrete, don’t forget to explore the benefits of a liquid waterproofing membrane. It offers easy application, excellent adhesion, seamless protection, durability, versatility, and a wide range of products to choose from. Stay dry and protected with this effective solution.

Liquid waterproofing membranes have been used in construction for decades and have proven to be a reliable and efficient method of protecting concrete structures from water damage. With advancements in technology and material science, these membranes have become even more effective and durable, ensuring long-lasting waterproofing solutions. Whether it’s preventing moisture intrusion in basements, roof leaks, or protecting foundation walls, liquid waterproofing membranes continue to be a top choice for professionals in the construction industry.

2. Cementitious Waterproofing Coatings

One option for waterproofing concrete is to use cementitious waterproofing coatings. Here are some key points to consider:

When choosing cementitious waterproofing coatings, consider factors such as the specific requirements of your project, the extent of water exposure, and the expected lifespan of the coating. Consult with a professional to determine the best product for your needs.

Remember, proper surface preparation and application techniques are crucial for the success of the waterproofing project. Ensure that you follow the manufacturer’s instructions and take necessary precautions. With the right coating and proper application, you can protect your concrete from water damage and ensure its longevity.

3. Silane/Siloxane Water Repellent

Silane/Siloxane Water Repellent is a popular type of waterproofing product for concrete. Here are some important points to consider when using this product:

  1. Penetrating Protection: Silane/Siloxane water repellents work by penetrating the surface of the concrete and forming a protective barrier. This barrier helps to prevent water and moisture from seeping into the concrete, reducing the risk of damage such as cracking, spalling, and corrosion.
  2. Invisible Protection: One of the advantages of Silane/Siloxane water repellents is that they provide protection without altering the appearance of the concrete. The product does not change the colour or texture of the surface, allowing the natural beauty of the concrete to shine through.
  3. Long-Lasting Performance: Silane/Siloxane water repellents offer long-lasting protection for concrete. They have excellent durability and can withstand harsh weather conditions, UV rays, and freeze-thaw cycles. This ensures that your concrete remains protected for years to come.
  4. Breathability: Another important feature of Silane/Siloxane water repellents is that they allow the concrete to breathe. This means that trapped moisture can still escape from the concrete, preventing issues such as efflorescence and mould growth.
  5. Easy Application: Silane/Siloxane water repellents are easy to apply and typically require just a single coat. They can be sprayed or rolled onto the surface of the concrete, making the application process quick and efficient.

When choosing a Silane/Siloxane water repellent, consider factors such as the level of protection needed, the condition of the concrete, and the specific requirements of your project. It’s always a good idea to consult with a professional or follow the manufacturer’s instructions for best results.

By taking these factors into account, you can ensure that you choose the right Silane/Siloxane water repellent to keep your concrete protected and in optimal condition for years to come.

4. Bentonite Waterproofing

4. Bentonite Waterproofing

1 Bentonite Waterproofing
2 Description
  Bentonite waterproofing is a method of waterproofing concrete that involves the use of bentonite, a type of clay, as a waterproofing material. Bentonite expands when it comes into contact with water, forming a waterproof barrier that helps to prevent water penetration into concrete structures.
3 Application Process
  The application of bentonite waterproofing involves mixing the bentonite clay with water to form a thick slurry. This slurry is then applied onto the concrete surface, forming a continuous layer. The clay particles in the slurry bond together, creating a waterproof barrier that seals the concrete and prevents water infiltration.
4 Advantages
  Bentonite waterproofing has several advantages. First, it is a cost-effective method of waterproofing concrete. Second, it is easy to apply and does not require specialised equipment or skills. Third, it provides a seamless and continuous barrier against water penetration. Bentonite is a natural and environmentally friendly material.
5 Limitations
  There are some limitations to bentonite waterproofing. It is not suitable for areas with high water pressure or heavy hydrostatic load. It may not be effective for concrete structures with significant cracks or joints, as the bentonite may not be able to form a complete seal in such cases.
6 Maintenance
  Regular maintenance is important to ensure the effectiveness of bentonite waterproofing. Any cracks or damaged areas should be repaired promptly to prevent water from seeping through. It is also recommended to inspect the waterproofing periodically and reapply the bentonite if necessary.

Factors to Consider when Choosing Waterproofing Products

When choosing waterproofing products for your concrete, there are several important factors to consider.

1. Purpose: Determine the specific purpose for waterproofing your concrete. Are you looking to protect against water leaks, moisture damage, or groundwater infiltration?

2. Type of concrete: Consider the type of concrete you are working with. Different waterproofing products may be suitable for poured concrete, precast concrete, or masonry.

3. Compatibility: Ensure that the waterproofing product you choose is compatible with the materials already present in your concrete. This will help ensure proper adhesion and long-lasting results.

4. Performance: Evaluate the performance characteristics of the waterproofing product. Look for factors such as durability, resistance to UV rays and weathering, flexibility, and crack bridging ability.

5. Application method: Consider the ease of application and the suitability of the application method for your specific project. Some waterproofing products may require professional installation, while others can be applied by DIY enthusiasts.

6. Environmental impact: Take into account the environmental impact of the waterproofing product. Look for eco-friendly options that are free from harmful chemicals and have low VOC (volatile organic compounds) emissions.

7. Warranty: Check if the waterproofing product comes with a warranty. A good warranty can give you peace of mind and protect your investment.

By considering these factors when choosing waterproofing products for your concrete, you can ensure that you select the best product for your specific needs and achieve optimal results.

Common Mistakes to Avoid during Concrete Waterproofing

Common Mistakes to Avoid during Concrete Waterproofing

Cost of Waterproofing Concrete

The cost of waterproofing concrete can vary depending on several factors, including the size of the area to be waterproofed, the type of waterproofing system used, and any additional services required. Here is a breakdown of the average cost range for different types of waterproofing methods:

1. Cementitious waterproofing: This method involves applying a cement-based coating to the concrete surface. The cost can range from £5 to £10 per square metre.

2. Liquid membrane waterproofing: Liquid membranes are applied as a thin coating that forms a continuous, protective layer. The cost for this method can range from £6 to £12 per square metre.

3. Bituminous membrane waterproofing: This method involves applying a hot or cold liquid bitumen layer to the concrete surface. The cost can range from £8 to £15 per square metre.

4. Polyurethane-based waterproofing: Polyurethane coatings are sprayed or applied as a protective layer. The cost for this method can range from £12 to £20 per square metre.

5. External waterproofing: This method involves excavating around the foundation and applying a waterproofing membrane. The cost for external waterproofing can range from £80 to £150 per linear metre.

It’s important to note that these prices are average estimates and can vary depending on the specific requirements of your project and the location. It is recommended to consult with a professional contractor to get an accurate cost estimate for your specific needs. Remember, investing in proper waterproofing can help prevent costly repairs and damage in the long run.

Some Facts About Waterproofing Your Concrete: Essential Steps and Products:

  • ✅ Without proper waterproofing, rainwater can leak into concrete, causing irreversible damage and loss of performance. (Source: Our Team)
  • ✅ Concrete reinforcement is necessary for proper waterproofing, both internally and externally. (Source: Our Team)
  • ✅ Waterproofing products such as bituminous coatings, cement-based waterproofing products, and acrylic, polyurethane, and polyurea-based materials can protect concrete against water. (Source: Our Team)
  • ✅ Concrete admixtures can be added to the cement during preparation to make it waterproof and durable. (Source: Our Team)
  • ✅ Type B waterproofing systems, such as Newton HydroTank and Newton RASCOtank, use reinforced concrete with sealing systems to prevent water from entering the structure. (Source: Our Team)

Frequently Asked Questions

How can I stop my concrete from leaking?

To stop concrete from leaking, you can use various waterproofing techniques. One option is to apply a protective coating, such as a bituminous coating or an acrylic, polyurethane, or polyurea-based material, directly to the concrete surface. Another option is to mix waterproofing products into the cement and water mixture during pouring. Additionally, concrete admixtures can be added to the cement to make it waterproof and durable. It’s important to ensure that all joints and cracks are properly sealed to prevent water leakage.

What is Type B waterproofing?

Type B waterproofing, according to the British Standard for Waterproofing (BS 8102:2022), refers to integrally waterproofing the concrete structure to prevent water from entering. Most basements, which are made of concrete, require at least two types of waterproofing, including Type B. This type of waterproofing focuses on the concrete itself, as well as areas where leaks commonly occur, such as poorly compacted or structurally cracked areas and joints between concrete placements.

What are the common areas where concrete is prone to leaking?

There are several common areas where concrete is prone to leaking. These include poorly compacted or structurally cracked areas, as well as joints between concrete placements. These joints can be sealed with hydrophilic waterstops or waterbars, but using an injection hose system, like Newton 302, is a safer option. This system permanently seals the joint with waterproofing resins and can prevent water from entering the structure.

What are the advantages of waterproofing concrete?

Waterproofing concrete offers several advantages. Firstly, it helps protect the concrete from water ingress, which can cause severe and irreversible damage to buildings. By preventing water leakage, waterproofing ensures a long-lasting and durable construction. Waterproofing also helps maintain the structural integrity of the concrete by reducing the risk of cracks and damage due to the expansion and contraction process caused by weather conditions. Additionally, waterproofing can help improve the energy efficiency of the building and protect it from waterborne contaminants.

What are the disadvantages of waterproofing concrete?

While waterproofing concrete has many advantages, it also has a few disadvantages. One disadvantage is the potential cost of waterproofing materials and services. Waterproofing can be an additional expense in the construction process. Additionally, if waterproofing is not done correctly or if there are flaws in the application, it can lead to waterproofing failures and water leakage. It’s important to ensure that waterproofing is done by knowledgeable and experienced professionals to minimize the risk of these issues.

Do I need to waterproof all types of concrete construction?

Not all types of concrete construction require waterproofing. Some construction methods, such as pre-fabbed concrete or insulated concrete form wall construction, are already designed to be waterproof. It’s important to assess the specific type of concrete construction you have and determine if waterproofing is necessary. If in doubt, consulting with a construction professional or general contractor can help determine whether waterproofing is needed for your specific project.

Get In Touch With Our Team

We Aim To Reply To All Enquiries With-in 24-Hours