There are a number of things to consider when planning external rendering, and it’s probably not a good idea for an inexperienced person to try it without any practice. Before rendering the walls of your home, it’s a good idea to practice on a garden wall to begin with. Better yet, you can hire a certified tradesman to do the rendering for you.
If you’re planning to render an old wall, make sure that any moss or mould is completely cleaned off with bleach to ensure the render sticks to the wall. Since you’ll be outside, only start if you’re going to have a few sunny days, as rain could wash the render off. Oh, and make sure you cover the wall at night if frost is in the forecast.
One of your options is a Lime Render. A very flexible application, they’re best used on timber framed style buildings that can experience movement or old, low quality stone walls. The lime will absorb the water, keeping it from reaching the timber or stonework. Lime renders can be done in a large variety of colours to allow the render to fit in well with the surrounding aesthetic. Other benefits are that a Lime Render is eco friendly and long lasting, with very little maintenance required. The downside? They can be expensive and require a skilled tradesperson to apply them.
Pebble Dash is a finish for a wet mortar render. The mortar is usually lime or cement based but all mortars have their own advantages and disadvantages.
There are a few different types of pebble dash available:-
– A Tyrolean Render, applied in several layers using a Tyrolean gun, is a cement render best used for covering mediocre brickwork.
– Wet Dash (or roughcast) is one of the more common types of pebble dash, where chippings are mixed into the mortar before it’s applied to the wall.
– Harling is usually a lime render where pebbles are lightly pressed into the render while it’s still wet.
Modern Acrylic Renders
Modern acrylic renders are used as a finishing coat to provide the desired finish in a variety of colours. Sometimes, they don’t require a base render and can instead be applied directly onto the brickwork.
Modern Polymer Renders
Modern Polymer Renders are compounds developed to change the properties of cement based renders. There are two main compounds used to increase the render’s usability:-
1) Nylon is embedded into the base coat to reinforce the base coat to provide an especially strong render before applying the finishing coat. The nylon is primarily added to the weak points on the wall as they’re the most susceptible to cracking.
2) Silicon is mixed into the render prior to it being applied to the wall. The silicon repels the water and protects the wall from soaking it up.
Spraystone renders are highly flexible finishes, usually acrylic based, that can be applied to a variety of surfaces that other renders can’t. They are light and can be used to realistically imitate a traditional stone finish or can even be used to look like a granite or marble finish. As it’s difficult to achieve the desired effect without a lot of experience, it’s strongly advised that you hire a professional to carry out this finish.
Now that you know the options available, it’s time to decide what render will best suit you, as well as the brickwork or stonework you have.
Disclaimer – This is a guest blog provided by a third party. As such, it does not represent the views or opinions of Right Surveyors ltd or any associated company.