Waterproofing an external brick wall is crucial to protect your home from moisture damage, especially in areas prone to rain and damp conditions. Over time, brickwork can absorb water, leading to structural issues, mould growth, and insulation problems.
By following a proper waterproofing process, you can extend the life of your brick walls and safeguard your property from unnecessary repairs. In this guide, we’ll walk you through the essential steps of waterproofing, from surface preparation to applying protective coatings, and provide tips for long-term maintenance to ensure lasting protection.
Let’s get straight to the point.
Waterproofing external brick walls involves inspecting and preparing the surface, cleaning it, repairing any damage, and applying a suitable waterproofing solution such as silicone, acrylic, or cementitious products. It’s essential to allow proper curing and drying, conduct a final inspection for coverage, and choose the right material based on the wall’s needs.
Regular maintenance, including annual inspections, cleaning, and reapplying the waterproofing coating every few years, is crucial for long-term protection. To maintain the wall’s integrity, monitor drainage systems and signs of water damage, like efflorescence.
Steps To Waterproof An External Brick Wall
Waterproofing external brick walls involves several steps to ensure the most effective protection. Proper preparation and application are key to a successful waterproofing job.
1. Inspect And Prepare The Brick Surface
Before applying any waterproofing material, the condition of the brick wall must be inspected. Look for signs of cracks, damage, or previous repairs.
Any cracks or gaps in the mortar should be filled to prevent water from seeping through these weak points.
- Clean The Surface: Use a wire brush or pressure washer to remove dirt, moss, and other debris from the brick’s surface.
- Repair Damage: Use a suitable mortar to fill in any cracks or gaps in the brickwork. Allow time for the repairs to cure before proceeding with the waterproofing process.
2. Apply The Waterproofing Solution
Once the brick surface is prepared, the waterproofing solution can be applied. The application method will depend on the type of waterproofing material being used.
- Silicone Or Acrylic Products: These can typically be applied using a brush, roller, or spray. Start at the top of the wall and work your way down, ensuring even coverage.
- Cementitious Waterproofing: Mix the product according to the manufacturer’s instructions and apply with a trowel or stiff brush.
3. Allow For Curing And Drying
After applying the waterproofing solution, it’s important to allow sufficient time for the product to cure and dry completely.
The drying time will vary depending on the material used, weather conditions, and thickness of the application.
- Monitor The Drying Process: Ensure the wall remains protected from rain or moisture during the curing phase.
- Reapply If Necessary: Some products may require additional coats for maximum protection, so follow the manufacturer’s guidelines.
4. Final Inspection
Once the waterproofing has dried, conduct a final inspection to seal the entire wall properly.
Look for missed spots or areas where the coating could be thinner and apply additional product as needed.
- Check For Even Coverage: Ensure all wall areas are adequately covered to prevent future water ingress.
Materials Used For Waterproofing Brick Walls
Several waterproofing materials are available, each with its benefits and best-use cases.
The choice of material depends on the condition of the brickwork, the building’s specific needs, and local weather conditions.
1. Silicone-Based Water Repellents
Silicone-based water repellents are a popular choice for brick waterproofing.
These products penetrate the surface of the bricks and form a protective barrier, preventing water from entering but allowing the wall to breathe.
- Advantages: Long-lasting and effective at repelling water while allowing moisture inside the brick to evaporate.
- Disadvantages: It may need to be reapplied after several years.
2. Acrylic Sealers
Acrylic sealers are another common waterproofing option. They create a thin, protective film over the bricks’ surface, blocking water from penetrating.
They are typically used when a smoother, more finished appearance is desired.
- Advantages: Offers a strong barrier against water while enhancing the appearance of the brick surface.
- Disadvantage: acrylic sealers may wear down quickly in high-traffic areas, requiring frequent reapplication.
3. Cementitious Waterproofing
Cementitious waterproofing products are typically used when a more heavy-duty, long-lasting solution is needed.
These are mixed with water and applied as a thick layer over the brick surface, offering excellent protection against moisture.
- Advantages: Highly durable and resistant to extreme weather conditions.
- Disadvantages: Due to the thickness of the coating, the brick surface may lose some of its natural appearance once it is applied.
4. Breathable Coatings
Breathable coatings allow moisture to escape the brick while preventing water from penetrating.
These are particularly useful for older buildings where maintaining the appearance and breathability of the walls is essential.
- Advantages: Keeps the walls dry while allowing trapped moisture to escape, preventing damage from inside.
- Disadvantages: More expensive than some other waterproofing options.
Long-Term Maintenance Of Waterproofed Brick Walls
Even after waterproofing, regular maintenance of your brick walls is necessary to ensure the longevity of the protection.
A well-maintained waterproof barrier can last several years, but periodic checks are essential.
1. Regular Inspections
Inspect the walls at least once a year for cracks, leaks, or areas where the waterproofing might fail. Early detection of problems can prevent more significant damage.
2. Cleaning
Keep the brick walls clean by removing dirt, algae, or moss that can build up over time. Use gentle cleaning solutions that won’t degrade the waterproof coating.
3. Repairing Damaged Areas
If you notice any cracks or damage in the mortar or bricks, promptly repair them. This prevents water from seeping through the wall and compromising the structure.
4. Reapplying Waterproofing Coating
Over time, the waterproofing seal may break down due to exposure to weather.
Depending on the type of waterproofing product used, you may need to reapply the coating every 5-10 years.
5. Check Drainage Systems
Ensure that gutters, downspouts, and drainage systems near the brick walls function correctly. Poor drainage can lead to water buildup and pressure on the walls, causing damage even if waterproofed.
6. Monitor Efflorescence
Efflorescence, the white powdery substance that can appear on brick walls, indicates that water penetrates the bricks.
If it occurs, it’s important to address the issue quickly to maintain the wall’s waterproofing integrity.
Conclusion
waterproofing an external brick wall is essential for protecting your home from moisture damage and maintaining the structural integrity of your property. You can effectively prevent water ingress by following the proper steps, including surface preparation, choosing the right waterproofing material, and ensuring even application.
Regular maintenance, such as inspections and reapplying the waterproof coating as needed, will help extend the protection. Whether you choose silicone, acrylic, cementitious products, or breathable coatings, keeping your brick walls in good condition will ensure long-lasting durability and peace of mind.
FAQs About Waterproofing
What Is The Best Waterproofing For Brickwork?
Unless you want to change the appearance purposely, the best sealer for brick walls is a non-gloss penetrating clear sealer. A siloxane-based formula like Masonry Saver Water Repellent or SuperSeal-M will penetrate most masonry brick walls deeply for optimal protection.
Should Exterior Brick Be Sealed?
Yes, exterior brick should be sealed to protect it from moisture, prevent damage, and increase longevity. Sealing helps prevent water from penetrating the brick, which can lead to structural issues, mould, and deterioration over time.
Do You Need To Waterproof Exterior Walls?
Check walls for faults: Waterproofing external walls is the best solution only if they become damp due to rainwater or moisture. Before shopping around for waterproofing products, it’s important to eliminate any other causes of structural dampness.
Can You Damp-Proof A Single Brick Wall?
You could also paint the affected wall with a clear brick waterproofing liquid. This will prevent rainwater from soaking in from the outside. All of these will prevent dampness from appearing inside. The foil makes a mechanical barrier; the others will greatly reduce the wall’s dampness.
Why Are My Outside Bricks Wet?
One of the main causes of damp bricks is a damaged damp proof course (DPC). A DPC stops damp rising from the ground and affecting the lower areas of the wall. If your DPC is not working properly, your property is vulnerable to rising dampness.
