Just like plastering, exterior wall rendering also requires practice and skill. If you can’t hire an exterior wall rendering expert and choose to do it on your own, here are some useful tips to help you throughout the process.
1. Preparing The Surfaces
If you’re not working with a newly built wall, you need to clean the surface properly to remove loose debris, dust, loose paint or any plants growing on it. Use a fungicide solution or bleach to clean the mold and use water to hose down the other debris. You can start rendering the wall when it is still damp but don’t do it when there is water running. Add polythene sheeting to the wall before you start to prevent any downpour from washing it out.
2. Properly Mixing The Render
Bring the equipment and materials for mixing the render close to the workplace to save time. Don’t forget to clean your tools thoroughly between and after using them. The render you’re mixing needs to form a solid, waterproof and strong surface to cover the layer of wall below it which could be stone, brick or old render. You can add sharp sand to the mix to make it as strong as possible.
3. Applying The Render
Set up screen battens if you’re rendering a wide wall. Use a steel plastering trowel to apply the render firmly. Apply the first layer of render and follow up with the second one after half an hour to make sure it has properly adhered to the wall. Remove the battens from the wall after about an hour very carefully and fill the holes left behind to guarantee a smooth layer. Don’t forget about the standard thickness for each layer to make sure it adheres properly.
Find a large and ordinary sponge then rub it very gently on the rendered wall to make sure the surface is closed completely to remove any holes. That way, you can make it waterproof, smooth and easy to paint. Once you’re done, you can wait for the rendering to dry up completely before painting to avoid any roughness.
Before rendering your exterior wall, you need to check with the local department to meet the standard regulations. You can also consult with a rendering expert to determine the best materials for doing the job without paying for the labor. Additionally, you can also watch numerous videos online to make sure you’re doing the right job to avoid compromising your exterior wall.