Washing the facade before painting: step-by-step guide for a sustainable result
Dirt and growth can ruin a freshly painted surface. That's why it's important to wash the facade before painting and create a clean and even base, so that the paint adheres and lasts longer. In this guide, we go through everything you need to know to clean effectively and avoid common mistakes.
Why is it important to wash the façade before painting?
Creates a clean surface for the paint to adhere
A clean façade gives the paint a better chance to adhere properly. Removing dirt, dust and other contaminants creates an optimal surface for the paint to bond to, resulting in a smoother and more durable finish.
Prevents dirt and mould from affecting performance
Dirt, algae and mould can negatively affect the quality and durability of the paint if they are not washed off before painting. Therefore, it is important that the façade is thoroughly cleaned to ensure the best end result.
Extends the life of the paint
A well-cleaned façade helps the paint last longer. Keeping the façade free of contaminants prevents paint degradation and keeps the newly painted surface in top condition for longer.
When should you wash the facade before painting?
The best time of year to wash the façade before painting is usually in spring or early summer - this gives the façade plenty of time to dry properly. However, avoid washing during extreme weather conditions such as rain, strong winds and high temperatures. Humid conditions can prevent the façade from drying properly, while strong sun can cause it to dry too quickly.
Preparations before you start washing the facade
- Check the condition of the facade: Before you start washing, it is important to inspect the facade for any damage, rot or loose parts.
- Protect windows, doors and plants around the house: Cover windows, doors and other parts that are not to be painted to protect them from cleaning agents and water.
- Collect tools and cleaning products: Make sure you have the necessary tools such as brushes, sponges, buckets and possibly a pressure washer.
Which detergent should you use to wash the facade?
Algae and mould removers
If you have algae and mould on your facade, you may need to use special products containing chlorine or hydrogen peroxide. Apply the product to a dry surface and leave it on according to the instructions. Often, you don't even need to scrub - the product will effectively kill and bleach the algae. However, don't forget to protect yourself with gloves and goggles.
Degreasing for heavy soiling or stains
Extremely dirty facades, especially in urban environments, need degreasing products. In such cases, it is wise to choose alkaline agents specifically designed for proper facade cleaning. Apply to dirty areas, leave on and scrub gently. Always test on a small area first and follow the manufacturer's instructions carefully.
Environmentally friendly alternatives
Eco-friendly cleaning solutions are becoming increasingly popular. This is extremely important when washing the facade before painting as you are outdoors and risk damaging nature with harmful chemicals. Many manufacturers, such as Cleano Production, offer eco-certified façade cleaning with natural ingredients that are gentle on the environment.
Step-by-step: How to wash the facade before painting
- Start by rinsing the façade with clean water to wet the surface.
- Apply the cleaner from the bottom up to avoid streaks.
- Leave the product to work according to the instructions - usually a few minutes.
- Scrub the facade thoroughly with a brush or sponge to loosen dirt.
- Rinse the façade thoroughly with clean water, again from the bottom up.
- Allow the façade to dry completely before proceeding with painting.
Common mistakes when washing facades before painting
Using too high a pressure jet - risk of damage to the facade
It's easy to think that the more powerful the water jet, the better the result, but this is a common misconception that can lead to serious problems. When you wash the façade before painting using a pressure washer, you risk damaging the façade material, especially on older houses or softer surfaces like wood and plaster. The water can penetrate cracks and joints, creating long-term moisture problems. Instead, you should use a lower pressure and let the cleaner do the job.
Not allowing the facade to dry completely before painting
Another common mistake is to rush into the painting phase before the façade has dried properly. Damp plaster or wood does not provide a good base for the paint to adhere to. This can lead to flaking, blistering or mould growth under the paint. Therefore, it is important to give the façade enough time to dry. The time varies depending on the weather and the façade material, but allow at least a couple of days in dry and warm weather, and up to a week or more in more humid conditions.
Using the wrong cleaner for the type of facade
Many people make the mistake of using the same product for all types of façades, which can damage the surface or result in insufficient cleaning. A wooden façade, for example, requires a milder detergent than a brick façade. That's why it's important to use a cleaner that is adapted to your specific type of façade. This way, you can clean effectively without damaging the material, leaving you with an excellent base for painting.
Frequently asked questions about facade washing before painting
Can I use pressure washing on all types of façades?
Which cleaning product is best for wood, plaster or brick walls?
How long should the facade dry before I can paint?
Tailor-made cleaning products for your business
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