110mm Rockwool EWI External Wall Dual Density Slab

110mm Rockwool EWI External Wall DD Insulation Slab delivers reliable thermal protection for wall insulation applications with third-party certified External Wall Insulation (EWI) systems.

Manufactured using Rockwool's Dual Density technology, these slabs feature a reinforced outer layer with superior density alongside a more flexible inner layer. This combination creates a robust surface ideal for render and fixture installation, whilst the softer underside accommodates substrate variations seamlessly.

When installed edge-to-edge, the slabs create an uninterrupted thermal envelope, eliminating thermal bridging through joints. Specified in EWI systems, 110mm Rockwool DD insulation delivers proven long-term performance, with stone wool insulation durability confirmed over 55+ years of real-world use.

Product specification

• Brand: Rockwool®
• Model: 110mm EWI
• Thickness: 110mm
• Dimensions: 1,200mm x 600mm x 110mm
• Length: 1200mm
• Width: 600mm
• Board Coverage: 0.72m2
• Colour: Pale white
• Density: 110kg/m3
• Compressive strength: ≥ 10 kPa
• Tensile strength: ≥ 10 kPa
• R-Value: 1.39m2K/W
• Thermal Conductivity: 0.036W/mK
• Material: Molten volcanic rocks
• Profile: Square edge
• Temperature resistance: up to 1000ºC
• Fire Classification: A1 Non-combustible
• Shipping method: Articulated Vehicle ǀ Courier
• Applications: External Wall Insulation Systems
• Features: Thermal and Acoustic Insulation Slab
• Manufacturer: ROCKWOOL®

The 110mm Rockwool External Wall Dual Density Slab combines precision engineering with proven performance for external wall applications. These 110mm external wall insulation boards employ dual-layer construction with distinct density grades: a softer base layer that accommodates building fabric imperfections, and a denser upper layer providing superior stability for render application. Installation requires mechanical fixings combined with quality adhesive, with a minimum of 7 fixings per square metre recommended for optimal security.

Application

Install 110mm Rockwool Mineral Wool insulation slabs according to manufacturer guidelines covering design and installation procedures. For superior adhesion, secure boards using mortar or adhesive alongside mechanical fixings.

Given mineral wool's substantial weight, the EWI-225 Premium Basecoat is recommended over standard adhesives designed for lighter materials. Apply a thin primer coat of adhesive to the prepared substrate, then apply basecoat and set the Fibreglass Mesh.

Non-combustible

110mm Rockwool stone wool achieves the highest 'A1 – Non-combustible' rating under European fire classification standards, guaranteeing no ignition risk or flame contribution.

Durable

1. 110mm Rockwool DD slabs preserve dimensional stability throughout the building's service life, resisting shrinkage and deterioration.
2. The reinforced outer layer supports secure basecoat bonding and prevents fastener over-penetration.
3. Demonstrates exceptional resistance to wind and moisture exposure during construction phases.
4. Proven track record: 110mm Rockwool has delivered reliable EWI performance across Europe for over 40 years.

Breathable

• 110mm Rockwool stone wool's open-cell structure enables water vapour passage whilst water-resistant fibres prevent moisture penetration.
• Provides vapour resistance equivalent to stationary air.

Thermal performance

Closely butted slabs allow fibre interlocking, preventing heat escape through joints and gaps in the insulation layer.

Acoustic performance

• EWI systems using 110mm Rockwool slabs increase building envelope mass, reducing sound and vibration transmission.
• The fibrous matrix enhances sound dampening, with testing confirming up to 8 dB improvement in weighted sound reduction index, Rw (varies by substrate).

Dual Density Slabs for External Walls

• Purpose-engineered for external wall insulation systems, Dual Density Slabs provide a stone wool insulation solution.
• Manufactured using ROCKWOOL's proprietary dual density process, these slabs incorporate a higher density upper layer contrasting with the lower density base. This delivers a stable surface for render and fixture attachment, whilst the compliant underside adapts to substrate variations.
• The top layer carries clear 'THIS SIDE UP' marking for straightforward installation and correct orientation.

More Information on 110mm Rockwool External Wall DD Slab

• Manufacturer Link: Rockwool DD
• 110mm Rockwool External Wall DD Slab represents high-performance insulation with diverse application possibilities.
• Browse our full Rockwool Insulation range and refine by thickness or coverage using the left-hand filters. For project suitability advice or bulk pricing enquiries, contact us on +4402038839057, email sales@insulationbee, or use Live Chat – Competitive UK Rockwool Insulation Pricing.