At EWI Pro, we specify many projects throughout the UK. They vary in size, scope, and system application. From large-scale commercial projects to small-scale residential, we cover every type of project. As we’ve discussed recently, we provide a comprehensive range of testing processes. These include wind-load tests, moisture testing, and pull-out tests. Our Technical Team also provides expert U-value calculations to ensure the system is suitable. In our new series of blogs, we will shine a light on specific projects and the build-ups they utilise. Keel Wharf is an excellent renovation and commercial EWI retrofit following a disastrous fire in the historic area.

Project details

• Substrate: Blockwork and sheathing board
• U-Value change: 0.13 W/m²K
• Basecoat: EWI-225 Premium Basecoat
• Finish: EWI-075 Silicone Render
• Colour: White, Blue (NCS1005Y, NCS 3020B)
• Location: Keel Wharf, Liverpool
• Installer: Danny Proservices Ltd

The project

The project demonstrates the incredible scope of our systems. We specify all manners of projects, from small-domestic to large-scale commercial projects. An apartment block of this scale represents a fantastic opportunity to effect meaningful change for many people. New blockwork tends to have a poor U-value; however, another issue inevitably cropped up with this project. Since the Grenfell Tower disaster, much focus has been placed on the fire resistance of external cladding. Mineral Wool is an extremely competent combatant to these dangers. However, the choice of Mineral Wool was not made with just this in mind.

In Liverpool, over 1,000 vehicles in a multi-storey car park were destroyed in a fire on New Year’s Eve 2017, with temperatures reaching 1,000°C. The car park demolition was delayed due to insurance claims and agreement issues. Nearby residents and Echo Arena spectators were evacuated during the fire, which started from a Land Rover. A new car park with a sprinkler system is planned for the site. No serious injuries were reported, but the fire resulted in an estimated £20m insurance claim.

Moreover, the fire affected the adjacent housing block, with tenants having to be evacuated as 21 fire crews battled the blaze. The fire necessitated a full refurbishment, which was placed on hold until private funding allowed the completion of works executed by Danny Proservices Ltd. Mineral Wool will no doubt provide peace of mind for the tenants and exceptional thermal and acoustic performance. As part of the full renovation, the internals of all apartments have been updated. Fire-resistant sheathing boards were also installed to supplement and support the heavy mineral wool boards. These products work harmoniously to create fire breaks and an overall preventative system.

Commercial EWI retrofit system

An uninterrupted thermal insulation envelope enhances energy efficiency, occupant comfort, and building structural integrity. It ensures no gaps or weak points allow heat escape or entry, significantly reducing the need for excessive heating or cooling, thereby lowering energy costs. Preventing thermal bridging, where heat circumvents insulation via conductive materials like metal or wood, guarantees more consistent heat flow resistance. This uniform insulation not only eradicates cold spots and drafts, enhancing indoor comfort, but also minimises condensation and mould risk within walls and ceilings, safeguarding building materials. Furthermore, it helps maintain healthy indoor air quality by regulating humidity levels and limiting outdoor pollutant infiltration.

Energy bill savings

Given the improvements to the U-values and the elimination of thermal bridges, tenants can expect savings of up to £700 per year, per the Energy Saving Trust. Moreover, the apartment blocks have energy-efficient lights, heating, and water systems.

Performance improvements

Insulation boards improve thermal comfort; however, the silicone render envelope vastly improves the weatherproofing capabilities of the façade. As such, the façade is protected for up to 25 years. The whole system also increases the durability of the construction.

Acoustic performance

Mineral wool, a widely used insulation material, exhibits excellent acoustic properties, typically reflected in its high Noise Reduction Coefficient (NRC) and Sound Transmission Class (STC) values. The NRC value of mineral wool usually ranges between 0.8 to 1.0, indicating superior sound absorption capabilities. Meanwhile, its STC rating can vary but often falls within the range of 45 to 60, demonstrating its effectiveness in blocking sound transmission through walls, ceilings, and floors. These characteristics make mineral wool ideal for soundproofing in a commercial EWI retrofit.

Condensation control

The system controls condensation by enhancing the wall’s breathability and thermal insulation. Mineral wool offers effective condensation control owing to its breathable yet water-repellent nature. This insulation material maintains its structural integrity and thermal performance even in humid conditions, allowing moisture vapour to pass through while resisting liquid water. This unique property helps reduce the risk of condensation build-up within walls and ceilings, thereby preventing issues like mould growth and structural damage. The insulation improves thermal performance, thus minimising internal cold spots where condensation could form. The system is designed to shift the dew point outward, preventing condensation within the structural wall.

Community Impact

The fire impacted the community greatly, with damage to apartments as well as the parking garage. The demolition of the parking garage also proved to be extremely disruptive and detrimental to the community feel of the apartment block. Once the funding for renovation was found to be insufficient, private investment stepped in to restore the apartment block. This level of private funding is crucial to areas like the Keel Wharf Apartment Block. Many families live in large blocks such as this one, therefore, providing warm and comfortable housing is extremely impactful. Keel Wharf is also a historic area of Liverpool. Renovation of the existing buildings also maintains the overall character of the area.