Robbie Hunter Plastering Roughcasting External Wall Insulation


 Established 2005

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Roughcasting Services

External Rendering & Roughcasting Services

Rendering & Roughcasting Services

We offer all aspects of external roughcasting services with both traditional render and innovative render systems as there are more cons than pro’s with conventional sand and cement.

Advancements in technology mean that traditional Roughcasting Services have come a long way and so too have external cladding and insulation systems. With the addition of specialist additives to the base materials, such as polymers, silicones, acrylics, aggregate reinforcements and anti-crack fibres, renders are a perfect, cost effective solution for a variety of external wall applications and can be applied either directly to the substrate, or alternatively applied as the final finish on an external wall insulation system

Traditionally in construction, render was made up of a simple sand and cement mix which was applied to substrates such as brick and block work to assist with waterproofing and to offer a more decorative external finish to homes and commercial properties. The trouble is, by today’s standards, they not only look ‘out-dated’, and they are also technologically inferior to modern systems and lower both aesthetic appeal and the value of your home.

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Types of Rendering

Wet Dash

Similar to dry dash except the top coat of aggregate is mixed with mortar to give a more durable finish more commonly found on coastal buildings and areas which are open to the elements due to its strength and durability the finish is more uniformed in colour than dry dash
the dash its self is usually hand applied using either traditional sand and cement – sand and lime which can be lime washed to a colour of the clients choice also available in polymers, silicones and acrylics

Roughcasting Services - External Rendering

Sand & cement Dry Dash

Although pleasing to the eye, is now more common in Local Authority refurbishment and regeneration projects (like the one above) rather than New Build. The final aesthetic appearance of any dash project can vary enormously depending on the colour of the dashing mortar chosen in conjunction with a complimentary aggregate.
A Dry Dash Finish can be used on full elevations or can be used together with other finishes, such as brick effect render, ashlar detailing or brick slip. Dry dash is ideal for use on both render only projects and as a final finish for external wall insulation systems.

Flat Scratch Back Renders

This is a coloured cementitious render scratched while the surface is still workable, but after the initial setting has taken place. The surface of the render is removed by the action of the scratching tool, and approximately 2 to 3 millimetres of render are removed exposing the open matrix of the aggregate mix. The true colour of the render is exposed with a light even texture.

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Advantages of using Machine Plastering / Roughcasting Services

Faster Project Turnaround.

As with internal projection, by applying external render with a plastering machine, a faster project turnaround is assured. The rendering stage is completed much sooner than conventional hand application with site mix render, enabling the project to move towards completion at optimum speed. Approximately 3 times faster.
Water Repellency. Our external rendering product range in use incorporates silicone water repellents as an integral part of the cement based render system. This technology imparts a high degree of water repellency to the render surface whilst allowing water vapour to pass through the render and let the substrate breathe.

Higher standards of finish.

Because the materials are machine applied, this means that the skilled plasterer spends the majority of his working time on the product. And that is ruling the wall level, shaving it back 100% flat, and Scratch floating an even and perfect finish. Conventionally, applying materials by hand can consume anywhere up to 50 percent of the working day. Against popular assumption, machine projection is also actually cleaner all-round.

Lower Maintenance.

The water-repellent surface ensures a freshly rendered appearance for a prolonged period. This finish is drier and thus more resistant to algae growth and the natural phenomenon of lime bloom. As opposed to site-mix sand and cement render, premixed silicone render technology has a far less chance for cracking.

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