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EWI-225 Premium Basecoat Render Adhesive 25kg

EWI-225 Premium Basecoat Render and Bedding Adhesive 25kg
EWI-225 Premium Basecoat Render Adhesive 25kg
  • EWI-225 Premium Basecoat Render and Adhesive
  • For Mineral Wool, Kingspan K5, EPS (Polystyrene)
  • External Wall Insulation (EWI) systems
  • Flexible, crack resistant and durable
  • Dual-purpose adhesive and basecoat
Estimated delivery:
In Stock
£ 39.18
Ex VAT: £ 32.65
  • Brand: EWI Pro
  • Model: EWI-225
  • Weight: 25.00kg
  • Dimensions: 450mm x 250mm x 150mm
  • SKU: EWI-225
  • Product code: P1-2498
  • MPN: EWI-225

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EWI-225 Premium Basecoat Render Adhesive 25kg is a BBA certified cement-based bedding adhesive and basecoat render for Mineral Wool, Kingspan K5, EPS (Polystyrene) and Wood Fibre External Wall Insulation (EWI) systems.

Base coat is manufactured from a mixture of white Portland cement, texturing aggregate, mineral fillers and hydrated lime, it creates a strong and durable adhesion to a range of substrates.

EWI-225 Basecoat Render is a flexible, crack resistant and durable adhesive and base coat render with high concentration of polymer modified binders.

Basecoat should be installed with the Fibreglass Rendering Mesh to form the reinforcement layer on top of the Mineral Wool, Kingspan K5, EPS (Polystyrene) or Wood Fibre thermal insulation system.

The Premium Basecoat EWI-225 is also used as the adhesive for attaching the various thermal insulation boards to the substrates with Insulated Render systems.

EWI-225 Adhesive and Basecoat Render comes as a dry mix powder in 25kg bags and should be mixed with 6.5 litres of clean cool water.

The average drying time for the bedding adhesive is 12-48 hours depending on weather conditions.

The drying period may be significantly longer in low temperature and high relative humidity.




Nominal thickness: 4mm - 6mm 

EWI-225 Basecoat: approx. coverage 5m2

Mixing time: approx. 5-10 minutes

Mixing ratio: 5.9 – 6.5 litres per 25kg bag

Application: by hawk and trowel

Weight: 25kg

Consistency: dry mix powder


Key points:

 · High strength cement-based bedding adhesive and basecoat render.

 · Breathable and waterproof.

 · Dual-purpose adhesive and basecoat.

 · Flexible, crack resistant and durable.

 · Frost-resistant.

 · High elasticity.


Substrate Preparation:

 · When using the EWI-225 Premium Basecoat as a bedding adhesive for Mineral Wool insulation, ensure the substrate surface is clean and free from any debris.

 · For uneven substrate surfaces, consider using the EWI-260 Levelling Mortar, which can be applied up to a thickness of 50mm to level out the substrate.

 · If the surface is dusty prior to starting the installation process, then consider using a jet wash first before coating the surface with the EWI-301 Substrate Primer.

 · For painted surfaces, check for structural stability first, then consider using EWI-310 Universal Primer, which will create an abrasive surface ready for the EWI-225 Premium Basecoat to key onto.

 · When using the EWI-225 Premium Basecoat as part of the basecoat reinforcement layer, ensure the Mineral Wool insulation boards are level prior to application.


Certification and Standards:

 · PN-C-81913:1998 Dispersion paints for façade painting.

 · European Technical Approvals ETA – 15/0576 and ETA – 15/0575.

 · BBA Approval Inspection Testing Certificate 18/5503.


*Further information may be found in our Downloads section.

Fairly easy access to all PDF files.

Datasheet ǀ Declaration of Performance - DoP ǀ BBA Certificate ǀ Installation Guide ǀ Certificates ǀ Brochure ǀ SPEC Sheet

Board covarage 5.00 m2
Colour Greyish
Consistancy Dry mix powder
Material Cement-based
Profile Bedding adhesive and basecoat
Thickness 4mm - 6mm 
Shelf Life One year from manufacture date
Application Temperature from +5 °C to +25 °C
Shipping method Courier
Applications External Wall Insulation
BBA Certified Yes (no. 18/5503)
Features Flexible, crack resistant and durable
Manufacturer EWI Pro®

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We deliver insulation materials to Mainland UK only. Deliveries to Highlands, Northern Ireland, Isle of Wight etc.. might be possible at additional cost.
We offer free delivery on most of the orders above £300 (excluding VAT) (except special products - shipping cost via courier - products marked ''Request A Quote'')

Delivery of some insulation materials might be extended due to the current situation (Covid-19, stock shortages, allocations).
If you need materials quickly please contact us - we will do our best to help you source materials needed.

We do not deliver on weekends and bank holidays. Sometimes we can deliver on Saturdays - please check with us before placing the order.
If you need any further information please contact us tel. 02081910776

We can help to calculate price per m2 or linear meter (one meter in length) cost, please just contact us via phone 02081910776, email or live chat. Alternatively, you can work it out yourself quickly and easily: to get cost per meter square please divide price shown in orange area by ''Required area (m2)'' Example price of £28.80 divided by board coverage 2.88m2 = cost of £10.00 per m2.


No matter whether you choose a local installer or a national company, there’s a few tips to help you find the right installer for your home insulation improvements, such as asking for recommendations and making sure that they’re part of a certification scheme. This makes sure that they have the right skills and standards of workmanship to carry out the installation, and you can be sure that they know exactly what they are doing.


1. Thermal inspection picture in portfolio

It’s worth seeing a installer’s previous work. There’s no harm asking if you can see any properties nearby that they’ve installed insulation in. Best way would be to see Infrared Thermal Imaging Inspections. Thermal cameras spot small, but key changes in temperature in different areas of a house, identifying problematic areas that the human eye never could and some that a visual inspection could only hypothesize.

2. Reviews

Along with checking recommendations and previous work, finding reviews online can often be a great way to find out if they provide a good service or not. However, it’s best not to solely rely on reviews you may find or review websites, as there’s no controlling who writes them.

3. Compare prices

Comparing prices will also ensure companies can’t take advantage of you and give you a fair price. 

4. Word of Mouth

The best way to find a great insulation installer is through recommendations. Make sure you ask friends and family. They will most likely give you their honest opinion and can tell you from first hand experience.


Whether you require a wall, cladding, external wall, loft or floor insulation fitted, you can find and hire your local insulation installers from popular UK web pages. A simple internet search will return thousands of potential installers near your area.



We are the stockist of construction materials and related products for both trade and DIY from most recognizable brands in the UK like Cordek, RCM, Promat, Rockwool, Isover, Celotex, Xtratherm, Ursa, Low-E, Cedral, Kingspan, Dufaylite, British Gypsum, K-rend, Ecotherm, Iko enertherm, Kay-Metzeler, Terrawool to allow you to complete your insulation job on time at competitive prices and the highest standards.


Whether you are a large company or a DIYer, if you need a large amount of insulation materials, we can offer quantity discounts at the best prices. Please contact us and our friendly customer service will try to find the best and cheapest solutions for you. We value your time and we will try to deliver the products as soon as possible at a reasonable price to your construction site or house. The UK's leading insulation supplier near you and your needs. Price List available upon request.
EWI-225 Premium Basecoat Render and Bedding Adhesive 25kg
EWI-225 Premium Basecoat Render Adhesive 25kg
£ 39.18