How to render a wall - a guide

Rendering a wall can completely change its look and make it tougher over time. In this guide, you’ll learn which tools you need, how to prepare properly, and the techniques that make a real difference. Whether you're working on a house wall or sprucing up a garden space, the method is simple once you know the steps.

First things first: make sure you've gathered everything. You’ll need render mortar (which you can find in colours like white, blue, or yellow), a chisel, trowel, scratching comb, paddle mixer, stiff broom, spray bottle, bucket, hose, sponge, soap, a drip cloth or tarp, a shovel, and a straight-edged float. Having the right gear ready to go saves you hassle and helps you get that polished, professional finish.

Start by getting rid of any old paint or crumbling render. A good chisel will help you scrape off rough patches until the wall feels even. After that, scrub the wall thoroughly with soap and a stiff broom to clear away dirt, moss, or any mould — they can mess with how well the new render sticks. Hose it down too, just enough to stop the surface from drying out too fast. Lay down a tarp or drip cloth to protect the ground from mess.

Now, check the render mortar packet for its recommended water-to-mortar ratio. Always pour the water into the bucket first, then slowly add the mortar powder. Begin mixing by hand with a shovel. When it starts to come together, switch to a paddle mixer or a drill with a mixing attachment. You want a smooth, even texture. Good mixing makes applying the render a whole lot easier and gives a stronger final result.

When it’s time to apply, scoop up the mortar with a trowel and press it firmly onto the wall, moving upward from the bottom. Keep that first coat about 0.5 cm thick. Smooth it out using your straight wooden plank, always working upward for the best finish. Once the first layer is on, run a scratching comb over the surface to create texture, which helps the second coat grip better. Let it dry for at least two hours before moving on.

For the second coat, apply it the same way but make it a little thicker — around 1 cm. Smooth it out carefully, then use a damp sponge to tidy up the surface and create a nice, clean finish.

One last step: mist the wall lightly with water once a day for five days straight. It might feel like a slow process, but this patient approach really locks in strength and prevents cracks, leaving you with a flawless, long-lasting wall.