In the 1960s and 1970s exposed aggregate concrete slabs were popular not only because of their resilience and their appearance. The ease of laying made them a favorite flooring on terraces and in the garden. After a few decades of neglected existence, they have seen an upswing again in recent years.
Frugal floor slabs
Laying exposed aggregate concrete slabs is a manageable technical challenge. The frugal panels can be easily moved, placed, grouted and brought to a uniform height. A concrete foundation is not necessary and post-processing of the surface such as sealing can be carried out, but is not important.
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Normally, the panels are placed on a bed of gravel and gravel and grouted with quartz sand. The only decisive work step for a permanently firm and level position is the thorough compaction of the laying bed. The irregular surface forgives slight shifts or minimal height differences.
Gravel optics in different colors
In particular, people with a preference for natural stone optics can often make friends with the pebble stone surface of exposed aggregate concrete as an alternative. Exposed aggregate concrete can be made from many different additions of rock. The pebbles are round and have different grain sizes. Smaller grain sizes can be found in exposed aggregate concrete with broken stones such as chippings.
The color palette includes all occurring stone colors and mixtures are also a popular variant. The random texture does not require exact placement to each other, which makes laying even easier. The tapered supporting concrete also makes it relatively easy to cut exposed aggregate concrete slabs. Since the price for exposed aggregate concrete slabs is below that of almost all other stone and concrete slabs, even a little breakage during processing can be tolerated.
How to lay exposed aggregate concrete slabs
- Exposed aggregate concrete slabs (40 × 40.50 × 50 or 40 × 60 centimeters)
- Rubber mallet
- Spirit level and / or guide line
- Possibly a pickaxe
- Protective gloves
- Possibly stone cutting machine
- Tamper or vibrator
1. Raise the bed
Dig a pit at least eight inches deep under the stone-laying surface. If the soil is loose, sandy or loamy, compact it with a tamper.
2. Refill bed
Fill the pit one after the other in three layers, each around five to ten centimeters thick, with gravel.
3. Compact bed
After each layer application, compact the chippings with the vibrator or tamper. When compacting, proceed according to the principle "A lot helps a lot".
Use the rake to straighten the final gravel layer surface. First take the tine side of the rake and turn the rake over after rough straightening. Now pull the grit evenly and think about a two percent gradient.
Lay out the exposed aggregate concrete slabs as desired and correct the position with the rubber mallet.
Spread the quartz sand evenly and sweep it into the joints.Tips & Tricks To prevent weeds from growing through the joints later on, you can place a special fleece under the exposed aggregate concrete slabs to stop this growth.