External Rendering PDF Print E-mail
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Tuesday, 21 February 2012 00:00

W & J Plasterers have experience in apply all forms of external render. There are four main types of finish outlined below. Each has its own unique look which is useful when trying to blend new render/dash with existing buildings.

External Services Include:





K-Rend is the UKs largest independant pre-mixed silicone render manufacturer.

The K-Rend silicone range incorporates silicone water repellants as an integral part of the cement render system.

This silicone technology imparts a high degree of water repellency to the render surface whilst allowing water vapour (air) to pass through the render allowing the substrate to breathe.

The water repellant surface ensures a freshly rendered appearance for a long period. The finish is drier and thus more resistant to algae growth and the natural phenomenon of limebloom.

All K-Rend renders are pre-coloured, with a wide range of colours to choose from,

Please use the colour chart for reference:




For more information on any of our K-rend products visit their site www.k-rend.co.uk


Pebble Dashing

The term pebble-dashing is often associated with the application of small stones that are seemingly stuck to a render on the outside of properties throughout the United Kingdom. Other names used to describe the process are Dry-dashing, Harling and roughcasting. It is a finish that according to Grand Designs presenter Kevin McCloud, is a building material for which "a revival is long overdue".

The functions provided by a pebble dash finish include:

  • Improved water shedding properties
  • Gives good impact resistance
  • Provides a low maintenance decorative finish
  • Protects the substrate
  • Gives architects and designers a wide choice of colour and texture



Wetdash (Roughcasting or Harling)

It is a traditional render which incorporates an aggregate of small evenly sized pebbles into the mix. Roughcast is a popular alternative to dry dash, especially in the Scottish regions, whereby a flat basecoat is applied followed by a through-coloured slurry coat which when evenly applied, provides an attractive, watertight, textured finish. Wet Dash is a cementitious product incorporating silicone technology to produce an attractive through-colour render with excellent water resistant properties. Suitable for coastal, suburban and rural environments. Produced by throwing a wet mix of granite chippings (usually 6mm to dust) and cement (1:1 mix) against the smooth towelled (but not floated) top coat of render whilst it is still green. The roughcast mix can be modified with sand to give the required consistency.

Smooth Float Finish

Produced by rubbing the towelled surface of the render using a wooden (or plastic) float or sponge to give a smooth finish. This is done after the top coat has taken up and become ‘green’. As the floating action draws the weak laitance (cemetitious liquid) to the surface, there is a tendency for cracking to occur while drying is taking place. For this reason float finish is usually associated with masonry paint finishes which fill the fissures (small cracks) and help prevent damage. The extent of cracking is usually related to the shrinkage characterises of the sand.




Last Updated on Tuesday, 21 February 2012 18:01
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