re-rendering pebbledash without removing pebbledash

How do I get rid of pebbledash?

Re-rendering pebbledash without removing pebbledash can be difficult if the right materials aren’t accessible. Removing pebbledash is a painful process, because removing the render requires hard work with a hammer and chisel, with the added risk of damaging the original brickwork. Typically, pebbledash is made from a sand and cement render – an incredibly unforgiving material that was often applied as a means of covering up a bad build job or cheap brickwork.

With the growing popularity of coloured render, pebbledash has been taking a bit of a hit of late, with pebbledashed house prices falling to reflect a national dislike. However, as long as the pebbledash is in good condition, there’s no reason this can’t be rectified without the costly expense of removing it.

Ways to re-render pebbledash without removing pebbledash

So how do you re-render pebbledash without removing the pebbledash render? There are a couple of ways you can do this which we are going to explore…

  1. Smoothing over the pebbledash with the Lightweight Basecoat

One of the best ways of re-rendering pebbledash without removing pebbledash render is by smoothing over it with our Lightweight Basecoat. This is the ideal material to use, because it can be applied at a thickness of 20mm thick without compromising structural integrity. You wouldn’t want to put a non-breathable material on top of the pebbledash because water needs to be able to escape from the walls, otherwise you may find yourself in an unpleasant, waterlogged situation.

The first step in re-rendering your pebbledash is to ensure that any loose stones are rubbed off.

The next step is to prime the pebbledash using the 310 Universal Primer, this will limit the absorptive capacity of the pebbledash render and will ensure that any dust is settled; it also provides a good grip for the basecoat to adhere to.

Once the primer has been left to set for 12 hours, you can go ahead and start preparing the Lightweight Basecoat for application. One 25kg bag needs mixing with 5 litres of clean water, using an electric paddle mix. Once mixed, leave for 2-3 minutes before re-mixing and then apply to the substrate using a plastering trowel. We recommend embedding Fibreglass Mesh within the basecoat, overlapping each strip by 10cm to ensure crack resistance and tensile strength.

Once the initial coat of 5-20mm has set, apply a ‘tight coat’ using a plastic, metal or felted float. After this has set, we advise applying a thin coat render such as Silicone Render; this is highly breathable and is available in a wide range of colours, so will provide an aesthetically pleasing finish.

  1. Externally insulating on top of the pebbledash

Another method of re-rendering pebbledash without removing pebbledash render is by applying insulation boards to the existing pebbledash. Even 20mm of EPS insulation secured to the exterior of the property can increase its thermal efficiency and create a smooth surface for a fresh layer of render to be applied to. The method of preparation is the same; any loose pebbles should be removed and the wall should be primed with the Universal Primer.

The insulation boards should then be secured to the substrate using the 225 Premium Adhesive. This should be applied to the whole of the back of the insulation boards – we don’t recommend doing the dot and dab method for applying insulation to pebbledash. Mechanical fixings should also be used to secure the insulation boards to the pebbledash.

Once the boards are set in place, you should have essentially created a new substrate for re-rendering pebbledash without removing pebbledash. Best practice is to rasp to EPS to achieve a smooth surface and remove the oily top layer, and then you can apply your render basecoat. We recommend using the Premium Adhesive as a basecoat for extra strength, embedding fibreglass mesh within the Premium Adhesive to ensure a strong and stable surface for the render. Finally, you can prime the basecoat using the SiSi Render Primer, leaving it to dry for 12 hours before applying either the Silicone or Silicone Silicate render.

And there you have it! Two easy ways to re-render pebbledash without removing the pebbledash render.

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