May 22, 2019


R J O’Callaghan offer machine applied coloured render systems

There are many different types of finishes that can be applied, with more than 500 colours available.

We value delivering the very best service possible for our customers in and around the Coventry & Warwickshire area, and we invite you to experience what we can offer you.
Take a look at some of our reviews On our Facebook page
We take a great deal of pride in our high end rendering service and we use only the highest Quality products.

Silicone rendering Hinckley 

Rendering Coventry

Silicone render system we completed in Coventry

Rendering Warwick

Completed project in Warwick 

Rendering Leamington Spa

 Silicone Rendering in Leamington Spa

Rendering Leamington Spa

Next door to the photo above, Again in Leamington Spa

Rendering Leamington Spa

Silicone render same as above In Leamington Spa

Rendering Warwick

Finished property in Warwick

Areas we offer our services include – Coventry, Nuneaton, Bedworth, Leicester, Warwickshire, Stratford- upon Avon, Leamington and surrounding areas.

Types of Finishes Include

Caparol Thermosan

  • Ready-to-use textured renders with Nano-Quartz Matrix Technology
  • High colour stability
  • Highly water vapour permeable
  • Weather-resistant, water-repellent
  • Ecologically compatible (eco-friendly), low odour


Caparol Amphisilan

Ready-to-use, structurable silicone resin finishing coat for mineral and organic wall and ceiling surfaces outdoors

Material Properties

  • Highly water vapour permeable
  • Water-repellent
  • Elegant application
  • Water-dilutable
  • Increased protection against fungal and algae infestation
  • Balanced filler-aggregate combination with non-fading pigments

Caparol Sylitol 

Ready-to-use, textured render based on silicate emulsion

Material Properties

  • Binder: Potassium silicate with low organic additives
  • Reaction to fire: A2-s1, d0 as per DIN EN 13501-1 (non-combustible)
  • Highly water vapour permeable
  • Weatherproof, water-repellent as per DIN 4108
  • Water-thinnable, ecologically compatible, low odour
  • Elegant application
  • No swelling under water stress
  • High degree of whiteness, no yellow staining
  • No thermoplasticity
  • Very low tension while curing

Implications of Damaged Render

The most common cause of cracking and bulging, tends to be frost action on moisture trapped between the render and the wall.

This is why small hairline cracks should be sealed when they first develop, otherwise water penetrating through can freeze and expand, blowing the render surface loose — resulting in even larger cracks.

In some cases, missing lumps of render are also simply down to physical damage. Either way, once damp becomes trapped behind the surface it can penetrate through solid walls.