What options do you have for rendering and what are the benefits?
Rendering is the process of applying cement-based mixture to external, or on occasion internal walls to achieve a smooth or textured surface. It is very similar in technique to plastering and is generally carried out by tradesman whom are equally skilled in both facets. Render has waterproofing and fire rating qualities but is also used for aesthetic purposes. It is very common in older properties within the United Kingdom where the original brickwork has eroded or ‘blown’ and requires immediate attention to rectify water ingress issues and integral stability to the property.
The main components of most renders are, cement, sand, water, and where required lime. A common mix ratio used for rendering is 6 parts sand, 1-part cement and where relevant 1-part lime, but this mix will always be tweaked to accommodate each individual project and its requirements. Any general-purpose cement can be used, although the sand must be fine and clean of any impurities. A coarser sand is generally used as the base layer and slightly finer sand for the top layer, or coat, as its known within the trade.
Excellent job with the rendering of our home. We would highly recommend Lord Roofing!
John and Sue, Newcastle
Additional additives can be included in the mix that will help with the bonding or slowing of the drying process, as well as pigments that alter the colour depending on the client’s personal aesthetic requirements. By adding lime, the render can be given a smoother texture, increasing its elasticity and making it less likely to crack after the drying process is complete.
Render is for the most part, mixed with cement mixer which ensures a thorough, even mix with the addition of the correct amount of water. The Render is then applied using a trowel in thin, smooth coats. A thin finishing top coat or finishing cleanse can be applied to achieve many differing decorative effects. Depending on the surface texture finish required, top coats may be applied using a trowel, sponge or brush. There is considerable skill involved in achieving different textures, finishing styles and decorative effects, and Lord Roofing and Ground Works Ltd only employ Master Renderers with a vast wealth of experience and knowledge within this field. This ensures our clients receive the exact finish they require, every time.
Pebble Dash Render or Dry-Dashing is a very common and traditional system that requires the application of stone aggregate into the final mix. This system was very common in the mid to late 1900’s but as times have moved on, so has the quality of the types of rendering options that are now available.
Acrylic, pre-mixed renders such as Parex, K-Rend or Weber have the advantage of superior water ingress resistance and strength, allowing application to more challenging surfaces, such as concrete, cement sheeting or cladding such as expanding Polystyrene. Most of the pre-mixed acrylic types can also be applied using specialist spray equipment, with some manufacturers offering one-coat systems. Whilst traditional Renders can take up to 28 days to fully set, acrylic renders tend to set in 24-48 hours, weather permitting. These new acrylic, pre-mixed renders also come in a large array of colour schemes to suit every client preferred choice, and ensure that the render will never require painting, unlike the traditional cement-based equivalent. Lord Roofing and Ground Works employ accredited Parex Render Specialists to guarantee a perfect finish for every work-scope undertaken.
A lime mortar (where lime is used as opposed to the traditional cement alternative) may be used for rendering older buildings, especially if lime mortar was used in the original construction. This has a far greater flexibility and therefore is less likely to crack. It is also ‘breathable’ allowing moisture to escape from the wall, but it takes longer to dry
Building Regulations may apply depending on the extent of the rendering work to external walls, dependent on the property. The Planning Portal states that where 25% or more of external wall is re-rendered, regulations will normally apply.
Listed Buildings may also require consent to be given for significant rendering works, and planning permission may be required before rendering a property in a Conservation area can commence. Lord Roofing and Grounds Works surveyor’s will establish exactly what will be required and take the relevant actions to ensure a painless and stress-free experience.
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