Impregnating and sealing patio slabs outdoors: a guide
Why impregnate patio slabs?
Impregnating patio slabs offers numerous advantages.
It protects the surface from the penetration of liquids and dirt, extending the service life of the slabs.
Impregnation is particularly recommended for natural stone slabs, as these are particularly susceptible to stains and discoloration.
In this article, you will learn how to successfully impregnate or seal your patio slabs.
Table of contents
The difference: impregnating or sealing?
When it comes to patio slabs, the question often arises: impregnate or seal?
The main difference is that the impregnation penetrates deep into the pores of the stones and takes effect there. In addition, the surface remains breathable, which is particularly desirable in outdoor areas, as sealed stones can crack in frost, for example.
The sealant in turn forms a protective layer on the surface.
While sealants often form a water and dirt-repellent layer, the breathable function of the surfaces is not retained here.
As a general rule: Find out in advance before using a product on your patio slabs.
You can find the right products for your surfaces in our surface finder.
Cleaning patio slabs before impregnation
Before you start impregnating the patio slabs, thorough cleaning is essential.
Thoroughly remove dirt, moss and algae from the surface of the patio slabs.
A high-pressure cleaner can be very effective here, but should be used with caution.
Followed by a cleaning agent selected according to the material.
Then allow the slabs to dry thoroughly, for at least 24 hours , before proceeding with impregnation or sealing.
This allows the surface protection to develop its maximum effect.
Removing weeds from the joints
An often forgotten detail in the maintenance of patio slabs is the removal of weeds from the joints.
You have the following options for removing weeds:
- Manually pull the weeds out of the joints.
- The use of a weed burner.
- The use of weed killers.
In our article on cleaning patio slabs, we provide helpful tips and tricks on how to clean your patio slabs sustainably.
Find out more there and then come back here.
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Applying impregnation: step by step
When impregnating patio slabs, the right method is crucial for a good result.
Apply the impregnating agent evenly to the clean and dry surface of the slabs using a brush or roller.
Make sure that the product can penetrate all the pores of the slabs.
Allow the impregnated patio slabs to dry for at least 24 hours before walking on the surface again or exposing it to further stress.
- Preparation:
- Cleaning (see previous section)
- Check the weather forecast – it should stay dry for 24-48 hours.
- Wear protective gloves and goggles.
- Cover adjacent areas.
- Apply impregnation or sealant:
- Select a suitable product for your panel material.
- Carefully read the instructions for use of the product, as these may vary from product to product.
- Apply the product evenly with a brush, roller or sprayer.
We recommend applying with a sprayer and then working in with a paint roller. - Work in overlapping strips to ensure even distribution.
- Drying:
- Allow the treated surface to dry for at least 24 hours.
You should also check the weather forecast beforehand if your patio is not covered. - Protect the area from rain and direct sunlight.
- Allow the treated surface to dry for at least 24 hours.
- Second order (optional):
- A second application may be necessary for highly absorbent materials.
- Wait 24 hours after the first application.
- Repeat the order process.
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The care of impregnated patio slabs
Regular care and cleaning of the impregnated patio slabs is important to maintain the protection and appearance in the long term.
Use mild cleaning agents for cleaning and avoid aggressive chemicals such as vinegar, which could attack the impregnation. Also avoid using high-pressure cleaners in the immediate vicinity of impregnated areas so as not to damage the protective layer.
- Clean the terrace regularly with mild cleaning agents.
- Avoid aggressive chemicals and high-pressure cleaners.
- Remove stains immediately to prevent permanent discoloration.
- Renew the impregnation or sealant every 1-2 years, depending on the load.
Why should I use impregnation or sealing?
The advantages at a glance:
Impregnations and sealers offer numerous advantages for your patio slabs.
They not only protect against external influences, but also make maintenance easierand extend the service lifeof your patio.
Advantages at a glance:
- Protection from the weather (e.g. UV radiation)
- Water and dirt repellent effect
- Reduced maintenance effort
- Lotus effect: water rolls off
- Impedes the formation of moss and algae
- Extending the service life of the terrace slabs
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Frequently asked questions about impregnating and sealing patio slabs
Patio slabs should be sealed to protect them from dirt, moisture and the effects of the weather.
This is particularly important for natural stone slabs or concrete slabs.