1. Priming the Substrate:
A brickwork substrate tends to be very porous, and so it will need priming with the Water Based Primer. We recommend applying this to the substrate by roller or brush. However, if you are rendering onto a very smooth substrate then we recommend applying the EWI-310 Universal Primer, as this contains aggregates which will provide a rough surface for the basecoat to adhere to. Ensuring that your substrate is adequately prepared is essential to ensuring that your render system will last.
5 litres covers 15-30m2 depending on the substrate.
1 coat takes 4 hours to dry.
2. Installing the Starter Track
When it comes to starter track, you have two options. Opt for aluminium starter track with a clip-on stop bead if you are looking to cut down on costs. Alternatively, if you want to ensure that thermal bridging is kept to an absolute minimum, we recommend using uPVC starter track. Both are available in a range of widths to house different thicknesses of insulation, and are drilled into the wall above the DPC.
UPVC starter track is available in 2m lengths.
Aluminium starter track is available in 2.5m lengths.
3. Preparing the Adhesive
The EWI-220 creates a strong, long-lasting adhesion, securing the boards to the substrate for years to come. There are a couple of options when it comes to choosing your EPS adhesive:
- EWI-210: a standalone adhesive for EPS. Not to be used in the basecoat layer. (mix each bag with 6.3l of water).
- EWI-220: a multi-purpose basecoat/adhesive for EPS, can also be used in the basecoat layer with mesh. (mix each bag with 5.8l of water).
- EWI-221: a multi-purpose basecoat/adhesive for EPS, ideal for use in the winter months at temperatures down to 0 degrees. (mix each bag with 6.3l of water).
The adhesive is applied to the back of the board using the dot and dab method. This will allow you to get a nice flat surface for the render topcoat.
1 x 25kg bag covers 4/5m2
(also available in bulk)
4. Applying the EPS Insulation Boards
Our EPS insulation boards are lightweight, easy to install and very effective. We sell EPS by the square metre in a range of thicknesses. For insulating a solid brick wall the general recommendation to reach building regulations is to opt for a 90mm thickness. Graphite EPS tends to develop an oily outer layer, so it’s important to rasp it to get rid of this and ensure that the basecoat adheres properly. Rasping also offers the added benefit of enabling you to smooth out any imperfections in the surface.
5. Installing the fixings
EWI Pro recommends that you install one fixing per corner, with an additional two in the middle of the insulation board. Plastic fixings should be used with the EPS insulation system as they significantly reduce thermal bridging. The fixings are available in a wide range of lengths to accommodate different thicknesses of insulation.
Plastic pin fixings are the recommended fixing for EPS insulation. These come in boxes of 200 or 100 depending on the length.
7 fixings are required per m2.
6. Applying the Beading:
Beading is essential for reinforcing external areas that are more prone to damage, for example, the corners and the areas around windows and doors. The required beads will depend on the property and which particular areas need reinforcing. We have a broad range of render beads that should be selected and applied as necessary, our beads are uPVC and are designed to be embedded within the basecoat layer.
7. Applying the Basecoat:
For EPS external wall insulation systems, we recommend using the EWI-220 EPS Basecoat for the basecoat layer, as this saves on material waste. TThe EWI-220 and EWI-221 contain reinforcing fibres, which guarantee a longlasting finish.
1 x 25kg bag covers 4/5m2
(also available in bulk)
8. Embedding the Mesh:
Fibreglass Mesh is embedded within the basecoat for extra reinforcement. This will ensure the system remains crack resistant.
1 x 50m2 roll covers 42.5m2 when overlapped
Our standard mesh is sold either by the m2 or in rolls of 50m2.
9. Priming the Basecoat:
A render primer should be used to increase the adhesion of the render to the basecoat, and can be tinted to match the colour of your render for an increased opacity. The type of primer will depend on the type of render you are using. For a Silicone Silicate system, we recommend using the SiSi Render Primer which comes in two different bucket sizes.
1 x 7L bucket covers 20m2
1 x 21L bucket covers 60-70m2
10. Applying the Render Topcoat:
Once the primer is dry, the render topcoat can be applied. We recommend using either the Premium Bio Silicone Render, Silicone Render, or Silicone Silicate Render. These are intended for creating a decorative finish; they are through-coloured with grains suspended within the mixture in a range of different sizes to achieve the desired texture.
Premium Bio Silicone is our highest performing render, offering advanced self-cleaning capabilities that tackle any signs of organic growth on the substrate, and extra UV resistance for a long-lasting finish. Silicone render is the ideal choice for a quality long-lasting finish as it has nano-silicone particles which are great for maintaining a clean facade. Silicone Silicate is excellent value, also offering vapour permeability. All of these options are highly flexible, so are ideal for ensuring that there are no problems with cracks.
1.0mm grain size: 1x25kg bucket covers c. 10m2
1.5mm grain size: 1x25kg bucket covers c. 7-10m2
24 hours (+)