Sealing exposed aggregate concrete slabs is pointless

As with normal concrete surfaces, sealing exposed aggregate concrete slabs is a questionable undertaking for many experts. The breathability of the concrete is restricted because seals no longer allow diffusion. With regard to the preventive effect of green growth and moss, opinions differ widely.

There is no ecological sealing

Put simply, a seal is the application of an impermeable protective film that prevents liquids from penetrating and, in the case of some products, the wax base for mosses and other plants. Stone oils and other natural stone treatment agents are not appropriate for a cement product that has no sealing effect whatsoever. They take care of the protruding surfaces of the pebbles or chippings, if at all.

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Industry sealants are all chemically based and correspond to a "plastic skin ". Acrylic resin components and hydrocarbons are typical ingredients. There are quite a few voices who consider the sealing of exposed aggregate concrete slabs to be completely useless and, if in doubt, tend to negatively affect the moisture balance of the slabs. The manufacturers advertise stone preservation, which applies to natural stone, but does not work with a concrete body.

Often apples and pears are thrown together

Special sealants for exposed aggregate concrete slabs are rarely offered. Usually these are products that should be usable for many different types of stone. The common list of natural stones and exposed aggregate concrete is astonishing. Sandstone and exposed aggregate concrete slabs have as much to do with each other as wood and plastic planks.

While protection against soiling can be an argument in favor of sealing with smooth concrete slabs, it does not apply to exposed aggregate concrete slabs. The irregular structure and the many smaller and larger cavities hold dirt on the surface without any problems, even if the seal is in place.

Conclusion: Sealing is superfluous

All in all, the sealing of exposed aggregate concrete slabs is not recommended, as both the protective effect and the care effect are very questionable. Sunlight is a good remedy against green growth, so that shading the exposed aggregate concrete slabs that is lifted or avoided has a greater effect than sealing it.

Tips & Tricks Pure baking soda in powder form has proven itself as a home remedy for organic soiling. The inexpensive means can simply be sprinkled on and distributed with water and a brush. After a short exposure, it is simply rinsed off and does not endanger plants, animals or the moisture balance of the exposed aggregate concrete slabs.