Introduction

Moisture, heat, snow, and rain are the forces of nature that exterior walls of buildings must endure every day and all the time. When moisture finds the tiniest breach, it gradually damages the structure by creating dark patches, becoming trapped in the walls, and molding. This is the reason why waterproofing structures has become a protective measure that is straightforward and effective.

Sika is the most trusted name in waterproofing for pros and has the longest reputation for being best in the waterproofing industry. The greatest thing is that you don’t have to be a contractor to use it successfully. Any homeowner with the proper preparation and a little patience can be expected to successfully use the Sika waterproof coating.

This guide is organized to aid the preparation for all of the steps necessary to be successfully completed with the Sika waterproof coating, the care of waterproofing sealant and other Sika products. Weather and moisture are the main concerns people have but in and walls that suffer the full impact, you will be shown how to repair the cracks and knowing what to do will enable you to make the improvement will be the main satisfaction you will receive open the guide.

Why Sika Waterproofing Products Are a Go-To Choice

Before we get into how to apply them, it’s helpful to understand why Sika’s waterproof solutions are a favorite at construction sites, in commercial buildings, and homes everywhere. Here are the reasons why professional contractors trust these products:

Here’s why professional contractors rely on them:

• Strong adhesion to most wall surfaces
  
• Flexible formulations that move with temperature changes
  
• Crack-bridging ability (especially valuable on older walls)
  
• UV resistance, essential for exterior walls
  
• Long-term durability backed by industry testing
  
• Easy application—even for beginners

Easy application, even for beginners. From the Sika waterproof coating through to the Sika sealant range, these products are designed to work in unison for complete moisture protection.

Step-by-Step Guide: Applying Liquid Waterproofing to Exterior Walls

Make sure to do this step at your own pace, and I can assure you that once your order of steps is right, you will achieve a professional finish.

1. Inspect the Wall Thoroughly

Before you break out any tools, inspect the entire surface of the wall.

Look for:

• Hairline cracks
• Long cracks
• Algae or Mould
• Patches of dampness
• Loose plaster or flaking paint

If you can see a large structural crack or bulge on the walls, suspend your work here and consult a professional. No amount of coating can relieve a structural problem.

2. Clean the Surface

A clean wall ensures the coating bonds properly.

Do this:

• Use a scraper to loosen and remove any plaster.
• Brush away dust using a stiff brush.
• Wash off mould and algae with a mild bleach solution.
• Let the wall dry fully before moving ahead.

If the surface is very greasy or is subjected to high pollution, contaminants include oil, asphalt, or smoke, there is usually a pressure washer on site that can be used to remove surface impurities.

3. Fill Cracks and Gaps Using Sikaflex Waterproof Sealant

Be sure to fill in any and all openings before putting on any liquid coating.Because it stays flexible, Sikaflex waterproof sealant is ideal as it stops new cracks from letting in water.

How to apply:

1. At a 45º angle, cut the nozzle.
2. Put the tube in the caulking gun.
3. Fill in the cracks in a steady and slow motion.
4. Use a gloved finger or a spatula to smooth the sealant.
5. Give it the recommended time to cure as it is stated on the labe.

This is a very important step. Every gap that is not properly filled offers a place where moisture can enter.

4. Apply a Primer

Depending on the wall material, you may need a primer for maximum adhesion.
Sika often recommends pairing their Sika waterproof coating with a compatible primer—especially on porous walls.

A primer:

• Enhances adhesion.
• Lowers absorption of the coating.
• Improves the lifespan of the coating.

Once the primer is applied, let it dry completely before going to the next step in the process.

5. Apply the First Coat of Sika Waterproof Coating

Now it’s time for the main event.

Tips for best results:

• For larger areas, a roller is recommended.
• If there are tight corners or edges, it is better to use a brush.
• Be sure to use a steady and even coating.

It is important that during your first coat you work in one direction only. This is to help achieve a uniform finish and coverage. Once you have completed a coat, let it dry fully. Drying time will be based on the weather and humidity, but Sika notes that

6. Add the Second Coat for Complete Protection

Upon the first coat being complete and dried, fully apply the second coat (this time rolling the opposite direction). The cross-hatch technique works to give better waterproofing and overall, tighter, stronger coverage.

Be sure to avoid way applying the second coat too early, as it could trap moisture and weaken the overall finish.

Once done, to complete the process, let everything sit to cure and finish based off of the guidance given. This is one, if not, the greatest reason as to why Sika waterproofing sealants, and codings are dependable, and dependable, is for the reason of being designed to bond waterproofing sealants and codings.

7. Inspect and Touch Up

Once everything is fully cured and dried, give the walls a once more complete inspection.

Check for:

• Missed spots
• Thin patches
• Joints, and the areas surrounding the corners

If necessary, apply a touch-up coat, or if an area is tight or small, apply Sika sealant waterproof material to help avoid water seepage.

Real-World Tips for a Long-Lasting Waterproof Finish

Pick a dry day.

You need good weather—no rain, no heavy wind, no freezing temperatures.

Don’t skip the curing time.

Rushing this step is one of the biggest reasons waterproof coatings fail.

Maintain your walls yearly.

A quick visual inspection saves you expensive repairs down the road.

Use compatible products.

Stick to the Sika system—coatings, sealants, and primers are designed to work together.

Best Sika Products for Exterior Wall Waterproofing

If you’re planning to shop online, Dortech Direct carries the full range of Sika waterproofing solutions, including:

• Sika waterproof coating
• Sikaflex waterproof sealant
• Sika waterproofing sealant
• General Sika sealant products for exterior repairs

Conclusion

Applying liquid waterproofing to exterior walls isn’t complicated—especially when you’re using high-quality Sika products. The real secret is in the prep work, sealing cracks properly, and giving each coat enough time to cure.

Whether you’re trying to prevent damp issues, protect aging walls, or simply strengthen your home’s exterior resilience, Sika’s waterproofing range gives you long-lasting durability and genuine peace of mind. And when you’re ready to get started, you can find all the trusted Sika waterproofing solutions you need at Dortech Direct.