Should You Seal Your Block Paving? Pros, Cons, and How-To

Block paving is a popular choice for driveways, patios, and pathways due to its durability, aesthetic appeal, and versatility. However, to maintain its appearance and longevity, many homeowners and businesses consider sealing their block paving. But is sealing necessary, and what benefits and drawbacks does it offer?

Sealing block paving involves applying a protective coating over the surface to enhance its durability, protect against environmental damage, and improve its overall look. While some argue that sealing is essential for preserving paving, others believe it is an unnecessary expense that requires ongoing maintenance.

In this article, we’ll explore the key aspects of sealing block paving, including its advantages and disadvantages, the best methods for applying sealant, and practical maintenance tips. By the end, you’ll have all the information needed to decide whether sealing is the right choice for your block paving.

What is block paving sealant?

Block paving sealant is a specially formulated liquid that is applied to the surface of block paving to provide a protective barrier. This barrier helps to prevent damage from weather, stains, and general wear and tear, while also enhancing the visual appeal of the paving.

Types of Block Paving Sealants

There are several types of sealants available, each offering different benefits:

• Acrylic Sealants –These are water-based and provide a breathable coating that protects against moisture penetration and UV damage.
• Polyurethane Sealants –A more durable option that offers enhanced protection against wear and chemicals but can be more expensive.
• Solvent-Based Sealants –These penetrate deeper into the paving, providing long-lasting protection but often require more careful application due to their strong fumes.
• Water-Based Sealants –Environmentally friendly and easy to apply, though they may require more frequent reapplication compared to solvent-based options.

How Sealant Works

Once applied, the sealant forms a thin layer over the surface of the blocks and joints, preventing water, oil, and dirt from penetrating the material. This can help to:

• Reduce the growth of weeds and moss by limiting the moisture needed for their growth.
• Prevent fading caused by UV exposure, keeping colours vibrant for longer.
• Enhance the overall look of the paving by providing a clean, uniform finish.
• Protect against staining from substances like oil, grease, and food spills.

Understanding the different types of sealants and their benefits will help you choose the right product for your block paving. In the next section, we’ll explore the key advantages of sealing your paving and why many homeowners opt for this additional protection.

The Pros of Sealing Block Paving

Protection Against Weathering

Sealed paving is better protected from the elements. UV rays can cause fading, while rain and frost can lead to cracks and erosion. A quality sealant prevents excessive water absorption, helping to maintain the structural integrity of the paving over time.

Reducing Weed and Moss Growth

By sealing the surface and joints, moisture penetration is reduced, making it harder for weeds and moss to grow. This means less maintenance is needed, saving time and effort on weeding and cleaning.

Enhancing Appearance

Sealed paving often looks newer for longer. Sealants can enhance the natural colours of the paving, providing a richer finish. Depending on preference, homeowners can choose from matte, satin, or glossy finishes to achieve the desired aesthetic.

Stain Resistance

Oil spills, food stains, and general dirt can easily penetrate unsealed paving. A sealed surface repels these substances, making it much easier to clean and reducing the risk of permanent staining—especially important for driveways where vehicle fluids are common.

Extending the Lifespan of the Paving

Regular sealing helps prevent wear and tear, reducing the need for costly repairs or replacements. It also protects the sand between the joints, preventing erosion and maintaining the paving’s stability over time.

While sealing provides these benefits, there are also some drawbacks to consider, which we will explore in the next section.

The Cons of Sealing Block Paving

Although sealing offers many advantages, there are some drawbacks that should be considered before making a decision.

Cost Considerations

Sealing block paving can be an added expense. The cost of sealant, tools, and professional application can add up, especially for larger areas. While sealing can extend the lifespan of the paving, it requires reapplication every few years, adding to ongoing maintenance costs.

Slippery Surface When Wet

Some types of sealants create a glossy finish that can become slippery when wet. This can be a safety concern, particularly for driveways and pathways with heavy foot traffic. To mitigate this, anti-slip additives can be mixed into the sealant.

Potential for an Artificial Look

While many homeowners enjoy the enhanced appearance of sealed paving, some feel that it creates an artificial, overly glossy look. This depends on the type of sealant used, with matte or satin finishes offering a more natural aesthetic.

Regular Maintenance Required

Sealed paving requires ongoing maintenance to keep it looking fresh. Over time, the sealant will wear down, requiring reapplication. Additionally, improper application or environmental factors such as heavy rainfall can cause the sealant to wear unevenly, leading to patchy appearances.

While sealing block paving has its drawbacks, many of these issues can be mitigated with the right products and proper application techniques. In the next section, we’ll help you determine whether sealing is the right choice for your specific needs.

Should You Seal Your Block Paving?

The decision to seal your block paving depends on several factors, including its location, usage, and exposure to the elements. Here are some key considerations to help you determine whether sealing is the right choice for your paving:

• High-Traffic Areas – If your block paving is frequently used, such as on driveways or commercial walkways, sealing can help protect it from wear and tear, stains, and weather damage.
• Weather Conditions – In regions prone to heavy rain, snow, or extreme sunlight, sealing can provide an added layer of protection against moisture penetration, frost damage, and UV fading.
• Weed and Moss Growth – If you struggle with weeds and moss growing between the paving joints, a sealant can help prevent this by reducing moisture retention and making it harder for plant life to take root.
• Aesthetic Preferences – If you want to enhance the appearance of your paving and keep it looking fresh for longer, sealing can provide a glossy or matte finish that enhances the natural colour of the blocks.
• Maintenance Commitment – While sealing reduces weed growth and makes cleaning easier, it also requires reapplication every few years. If you’re willing to commit to occasional maintenance, sealing can be a good investment.

Ultimately, sealing block paving is not essential, but it can provide significant benefits depending on your needs. If longevity, easy maintenance, and a polished appearance are priorities, sealing may be the right choice for you.

How to Seal Block Paving: A Step-by-Step Guide

Preparing the Surface

1. Cleaning – Use a pressure washer with a fan spray attachment to remove dirt, moss, and stains. Avoid a high-pressure jet, as this can dislodge the sand between the blocks.
2. Drying – Allow the surface to dry completely for at least 24–48 hours before sealing.
3. Reapplying Kiln-Dried Sand – Sweep kiln-dried sand into the joints using a stiff broom. Ensure the sand fills the gaps to provide stability.

Choosing the Right Sealant

1. Determine whether you need a water-based or solvent-based sealant based on durability and ease of application.
2. Choose between a glossy, satin, or matte finish based on your aesthetic preference.
3. Consider adding anti-slip additives if the paving will be exposed to heavy foot traffic.

Applying the Sealant

1. Stir the sealant thoroughly before application to ensure an even consistency.
2. Use a sprayer, roller, or brush to apply a thin, even coat across the paving.
3. Allow the first coat to dry for at least 4 hours before applying a second layer for maximum protection.

Drying and Curing

1. Keep foot traffic off the area for at least 24 hours to allow initial drying.
2. Avoid driving on the surface for 48–72 hours to ensure full curing and durability.
3. Check weather conditions before application, as rain can affect the curing process and lead to uneven results.

Common Mistakes to Avoid When Sealing Block Paving

Even with careful preparation, mistakes can occur during the sealing process. Here are some common errors and how to avoid them:

Sealing Damp or Dirty Paving

Applying sealant to a damp or dirty surface can cause patchiness and poor adhesion. Always ensure the paving is completely dry and free of debris before starting the sealing process.

Overapplying Sealant

Too much sealant can leave a sticky or cloudy finish, which may not cure properly. It is best to apply thin, even layers and allow sufficient drying time between coats.

Using the Wrong Type of Sealant

Not all sealants are suitable for every type of block paving. Using the wrong product can lead to discoloration, poor adhesion, or inadequate protection. Always check manufacturer recommendations before purchasing a sealant.

Ignoring Weather Conditions

Applying sealant in wet, humid, or extremely hot conditions can affect the curing process and final appearance. Choose a dry day with moderate temperatures for the best results.

Not Re-Sanding Before Sealing

Failing to reapply kiln-dried sand between the paving joints before sealing can lead to loose blocks and reduced stability. Always refill the joints with sand after cleaning and before sealing.

By avoiding these mistakes, you can ensure a smooth and effective sealing process that enhances and protects your block paving for years to come.

Maintenance Tips for Sealed Block Paving

Once your block paving is sealed, proper maintenance will help extend its lifespan and keep it looking its best. Follow these essential tips to maintain your sealed paving:

Regular Cleaning

• Sweep the surface weekly to remove dirt, debris, and leaves.
• Wash with a mild detergent and warm water every few months to prevent grime build-up.
• Use a pressure washer on a low setting if deeper cleaning is needed, but avoid high-pressure jets that can damage the sealant.

Reapplying Sealant When Needed

• Inspect the paving every 2–3 years for signs of wear, fading, or reduced water resistance.
• Reapply a fresh coat of sealant when you notice the original layer beginning to wear away.
• Always clean and re-sand joints before resealing to maintain stability.

Preventing Stains and Weed Growth

• Clean spills immediately to prevent staining, especially from oil or grease.
• Address any moss or weed growth promptly by using a mild herbicide or manually removing them.
• Consider reapplying a protective sealant layer to high-traffic areas more frequently.

Avoiding Harsh Chemicals

• Avoid using strong acids, bleach, or harsh chemical cleaners that may degrade the sealant.
• Opt for pH-neutral cleaning products specifically designed for sealed paving.

By following these maintenance practices, you can keep your block paving looking clean, fresh, and well-protected for many years to come.

Conclusion

Sealing your block paving can be a worthwhile investment, providing protection against weathering, stains, and weed growth while enhancing its overall appearance. However, it’s essential to weigh the benefits against the maintenance requirements and costs.

By following the proper sealing process, avoiding common mistakes, and maintaining your paving correctly, you can ensure it remains in excellent condition for years to come. Whether you choose to seal it yourself or hire a professional, careful application and periodic resealing will help extend the lifespan of your paving and keep it looking its best.

Ultimately, the decision to seal your block paving depends on your needs and preferences. If you want a longer-lasting, low-maintenance, and visually appealing surface, sealing is a smart choice that will pay off in the long run.