How to render an outdoor wall
Difficulty rating: Medium
These tasks may be tricky so will suit you if you're experienced in DIY, or simply love a challenge.
Before you get started on any of our 'how to' guides, please take a moment to read through our DIY safety tips.
What You'll Need:
Rendering your exterior walls so that they’re perfectly smooth gives you the perfect base for decorating the outside of your home. You’ll generally only need one coat of render, around 4 to 6mm thick. Here’s our guide to making sure the render goes on as smoothly as possible.
Before you render, prepare the wall by cleaning it with a stiff bristled broom. This will make sure your surface is dust-free and grease-free.
When rendering coarse bricks, brush them with water before you start. This will minimise dust, so the render will have a better surface to adhere to.
Add the render product to some water in a bucket and mix according to the instructions on the bag. You’re aiming for a toothpaste consistency for the render.
There are a couple of different techniques to applying render: Either tilt the hawk onto the trowel and then apply the render at a 45 degree angle or place the hawk’s edge on the wall and brush up from there.
If you’ve got vents on your wall, render up to the vent with a slight overlay around the edges.
Let the render dry for about 30 minutes until it’s firm to touch, then use a straight edge to flatten out - or screed - the render.
Next fill in any hollows with more render. Hollows are areas where the render is coming away from the wall, and you can spot their lighter colour.
You’ll now need to float the wall to fill in any remaining small hollows. A float is a tool that smooths the surface of the wall. As well as improving the look of the wall, floating closes the surface to make it durable. You may need to add a little water as you work, depending on how dry the wall is.
Now sponge the wall to give it a nice, smooth finish. Use a damp sponge – not too wet – for the perfect job.
If you need to cut around a vent, use the edge of your float to give you a straight line. Find the edge of the vent and use a small trowel to gently cut around it. Sponge off any marks for a great finish.
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