EWI-220 EPS Basecoat Adhesive is our most popular adhesive for EPS. It is a dual purpose product, used to fix EPS insulation to substrates and also as part of the basecoat reinforcement layer. Once dry, the adhesive provides a strong, flexible and waterproof layer. Being dual-purpose, this product allows installers to have only one type of bag on site, meaning less wastage.
EWI-220 is prepared in the same way regardless of whether it is being used for the basecoat reinforcement layer or to fix the EPS insulation boards to the substrate. The following substrates are suitable for the application of EPS insulation boards using EWI-220: ordinary concrete, walls of ceramic and silicate elements, concrete, light-aggregate and cellular concrete with untreated surface, plastered, painted or textured.
The EPS Basecoat Adhesive comes as a dry mix in 25kg bags and needs to be mixed with clean, cold water (6.3 litres) prior to use. We suggest using a large bucket and adding the water prior to the EPS Basecoat Adhesive. Once the product has been added to the water, it needs to be mixed using a paddle mix until an even consistency mortar is produced. Once the EPS Basecoat Adhesive has been mixed, leave the bucket for 5-10 minutes and then remix using the paddle mix – the adhesive is then ready for use.
If using the EPS Basecoat Adhesive for the basecoat layer, apply the basecoat using a 10mm notched trowel to the substrate. Next, embed overlapping pieces of Fibreglass Mesh; the mesh should sit within the middle of the basecoat layer. Once embedded, the basecoat layer should be 6mm in total.
When applying EWI-220 to the back of EPS insulation boards, the adhesive can be applied in two waits. Either apply EWI-220 to the whole surface of the EPS board using a notched trowel, or apply it to the perimeter of the insulation board with 3 dabs across the middle. If using Mineral Wool, then EWI-225 (Premium Basecoat) must be used instead of EWI-220.
Comes in powder form in a 25kg paper bag.
Store in a cool, dry place. Avoid ingress of water. Shelf life: up to 12 months from the date of manufacture.