Filling exposed aggregate concrete and plastering

Plastering exposed aggregate concrete is similar to plastering other stone surfaces. The main difference is the filling of the cavities in the surface, which is easily made possible by a correspondingly higher amount of plaster. In the case of vertical exposed aggregate concrete surfaces, a reinforcement mat can be embedded in the plaster.

Conventional plaster structure

When plastering exposed aggregate concrete, the conventional structure of plaster is used. The sub-plaster is spread over the first adhesive bridge, if necessary a reinforcement mat is inserted and finally the finishing plaster is applied.

  • Also read - Making exposed aggregate concrete with sugar
  • Also read - Dispose of exposed aggregate concrete panels properly
  • Also read - Refurbishing exposed aggregate concrete - Mending quickly and effectively

To beautify exposed aggregate concrete slabs, plastering is often chosen as the basis for later painting the surface. After completion, the exposed aggregate concrete can no longer be recognized as such.

How to plaster exposed aggregate concrete

  • Cement mortar
  • Cement-lime plaster
  • water
  • Possibly reinforcement mesh
  • high pressure cleaner
  • Root brush or scrubber
  • Cleaning trowel
  • Plaster sprayer
  • Paddle
  • Drill (€ 48.00 at Amazon *)
  • bucket
  • Aluminum peel bar

1. Clean

Thoroughly clean the exposed aggregate without the use of cleaning agents. A high-pressure cleaner is best and you can remove individual green growth with a brush or scrubber.

2. Possibly lose weight

If you want to plaster a vertical exposed aggregate concrete surface, you can make your work easier by removing the panels. If dismantling and reapplying is too time-consuming, leave it alone.

3. Reason for detention

Mix a highly liquid cement mortar or special primer (€ 36.80 at Amazon *) mortar according to the manufacturer's instructions. Spray or spray it evenly onto the exposed aggregate concrete with the trowel or spray device. Make sure it reaches and covers all the voids between the pebbles.

4th. Concealed

Mix the lime cement with the drill with a paddle mixer according to the manufacturer's instructions. Use products from the same manufacturer for the concealed and upper plaster. The plaster is used as a backfill on exposed aggregate concrete. If necessary, put on reinforcement meshes while you "throw up " the plaster with the trowel. Roughly smooth the surface.

5. Finishing coat

You apply the finishing plaster as a finish that will shape the visible surface. If you use decorative plaster, process it as directed by the manufacturer. As a substrate for later painting, smooth the plaster with a few splashes of water and an aluminum peel bar.

Tips & Tricks In the case of very coarse exposed aggregate concrete with large cavities, the plaster can also be carried out with lime mortar. Here, too, make sure that the product matches the finishing plaster.