How To Render A Wall
We explain how To render A wall:
We would never advise anyone to render their own wall. The materials used and the techniques applied take years of skill to perfect and for a job as big as rendering you would not want to get it wrong, which you most likely would!
With this is mind we see no reaosn why yo can not learn a bit more about the process and for this reaosn we have put together this guide on “how to render a wall”.
As a cursory introduction to external rendering we hope you find it interesting.
As with most tasks the most important stage is preparation, the surface to be rendered must be dust free, any loose or flaky residue must be removed.
If need be the surface should be damped down or even primed with a bonding solution such as S.B.R which is a cement bonding agent.
Mix 5ltrs of clean water to one 25kg bag of fibrocem render, mix thoroughly with electric paddle (mega mix paddle).
Make the consistency to suit the surface to be coated, i.e worse the surface is stiffer the mix should be. Using a steel plastering trowel preferably 14″ and a plasterers hawk (hand board) prepare the wall for the first bonding coat, all external corners should have a right angle corner bead fixed using the g.r.c.
Once beads are fixed start trowelling the render onto the wall, starting at the top left hand corner. (always trowel left to right)
Thickness can vary up to 12mm depending on how bad the substrate is.
Once the first base coat is covered the whole area to be rendered must be prepared for the second pass of render. Clean your tools in clean water, and with a polymer render it is best to apply the second base coat (fresh on fresh) before first coat totally dries out.
The mix for second pass should not need to be as stiff as the first pass so long as the first pass was applied correctly, the second pass is basically just a skimming coat to tidy things up. As on the previous coat you start trowelling from the top left hand corner of your wall always trowelling left to right. Again when the whole wall is covered, clean your tools in water and prepare to finish. Depending on the weather conditions the timings can vary (rule of thumb) as the second pass dries if you are unable to put a thumb print in the surface, then the render is ready to be finished off.
Using a plasterers sponge, again starting at the top left hand corner, dampen your sponge and using small circular movements take out any high points or voids. When cured the now rendered surface is then ready to accept any decorative coating.
We hope this article has given you some insight into the methods we use to ensure the most professional job is delivered.
Our advise for novices…”do not try this at home!”