Step-by-step: through-coloured render systems

Step-by-step: through-coloured render systems

Alex Chalmers, MD of Wetherby Group, describes the benefits of using a Monocouche through-coloured render system with a step-by-step guide to application.

 Buildings in the UK are under attack from increasingly extreme weather conditions. Water penetration, frost and UV attack rays from the sun all affect the fabric of the buildings in which we live, work and visit.

Render systems are one of the options available to protect brick and blockwork on both new build and refurbishment projects as well as add to the design aesthetics of the building.

When choosing the correct render, it is vital to consider the substrate to which it will be applied. A system that has been extensively tested and known to adhere to a wide range of different substrates is very important to ensure the longevity of the render system. A choice of finishes is also a large consideration so that customer visual expectations are met. Through-coloured render systems are low maintenance, waterproof yet breathable. Application is easy by hand or spray.

Here we demonstrate application by hand onto medium density concrete blocks in easy steps.

Step 01 – prepare the surface

Ensure that the background is clean, dry well bonded and free from anything that may impair adhesion. Apply clean water to control suction if required.

Step 02 – mix the render

Mix each bag with 4.5 to 5 litres of clean water with a high speed power mixer for two minutes, stand for two minutes then mix again.

wetherby step-by-step

Step 03 – fasten the beads

Fix beads to corners or joints where required.


Step 04 – render application (1st pass)

Using a stainless steel trowel or spray pump apply a first pass of render to a thickness of approximately 9mm.


Step 05 – reinforcing mesh

Embed fibre mesh reinforcing at stress points, around windows and door openings.

wetherby 5

Step 06 – render application (2nd pass)

Apply a second pass of 9mm wet on wet then, using a serrated edge, level and remove any air pockets. Allow to dry until render will show impression of a thumb nail but not a thumb print.

render step 6

Step 07 – scraping

Scrape back to 15mm using a scraping tool and ‘I’ Bar to ensure surface is flat and level.

render wetherby

Finished appearance

The finished render has a natural stone like appearance and is available in a choice of 33 colours.

Here at Wetherby Group we have developed our Ecorend product range into a force to be reckoned with but, as well as that we also offer a support service second to none. This includes the supply of full system specifications to NBS standards for all types of substrate and application. Full technical support on products and application is also available.

Also, with our innovative Smart Pack waterproof packaging product can be stored outside therefore saving both merchants and contractors storage space and cost. The packaging is clean and fully recyclable so further savings can be made on waste disposal.”

Ecorend MR1 Monocouche through-coloured render system now comes complete with a British Board of Agrément Certification


The complete M20 Specification for the Application of MR1 Monocouche Through-Coloured Render onto multiple different types of substrates includes the following additional products all available from the Ecorend range:

Ecorend Fungicidal Wash

Ecorend Fibre Reinforcing Mesh

Ecorend S10 Bonding Primer (if required)

Ecorend TRX Nano Coat is an optional high performance top coat to additional protection against dirt pick up and long-term staining in just one coat.




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