External Wall High Density Slab is suitable for use on the following construction types:

• External walls.

External Wall HD slab is available in the thickness from 30 mm providing thinner board options for areas where space maybe restricted:

• Window reveals.
• Door reveals.
• Refurbishment and thermal upgrades.

External Wall HD Slab is a stone wool insulation solution specifically for use in external wall insulation systems where a higher density slab required. It is available in thicknesses ranging from 30–200 mm and can provide alternative, thinner options for areas of the external wall where space is restricted, like window and door reveals.

Pre-installation trials are recommended to determine that the level of unevenness in the substrate can be covered without gaps forming between slabs. Once installed and tightly joined together, the edges knit together, providing a continuous insulating layer of trapped pockets of air with no gaps and no associated loss of thermal performance.

Features and benefits:

• Non-combustible - achieved the A1- Non-combustible rating under the European Reaction to Fire Classification System.
• Dimensionally stable and won’t shrink or degrade over the lifetime of the building.
• The dense outer surface provides a solid face for base coat application, and helps to prevent overdriven fixings.
• Offers a high resistance to wind and rain when exposed during installation.
• Tried and tested: EWI providers across Europe have been using ROCKWOOL in their systems for over 40 years.
• The breathable open-cell structure of ROCKWOOL stone wool allows water vapour to pass through, while the randomly oriented water-repellent fibres work to prevent water ingress.
• ROCKWOOL stone wool has a vapour resistance similar to that of still air.
• When tightly butt jointed, the fibres of adjacent slabs will effectively knit together, eliminating heat losses that would otherwise be caused by gaps between slabs.
• Help to limit the transfer of sound and vibration, while the fibrous nature of the product also helps to stop sound through absorption.
• Test evidence demonstrates an improvement to the weighted sound reduction, Rw, of up to 8 dB (substrate-dependent).