External Wall Insulation (E.W.I.) is the most effective way of thermally protecting a building and is able to ensure maximum carbon savings for practically any development.
Quickly and easily applied it can be finished in a choice of textures and in any colour.
On old buildings it is used primarily to make them thermally efficient, but because it is clad to the outside, it can also be used to protect the structure. The rendered finish shields the building from the elements whilst giving it a new look, saving time and money on other trades.
With new builds, walls can be constructed in very little time as insulation and finish can be achieved simultaneously reducing construction time and cost.
With a variety of systems, finishes and detailing, speed and efficiency can be combined with design to create whatever look is required.
Advantages of External Wall Insulation taken from the Governments Good Practice Guide no.293
- Protects the fabric of the building.
- Improves thermal performance.
- Ensures consistent U-values.
- Reduces thermal bridging, minimising condensation and heat loss.
- Reduces thermal stress on the structure or substrate.
- Transfers the dew-point to outside the structural wall element.
- Improves airtightness of the construction, which reduces draughts and heat loss.
- Optimises use of thermal mass, reducing internal temperature fluctuations.
- May contribute to improved sound insulation as part of general refurbishment strategy, eg window replacement.
- Available in a wide range of external finishes.
- Is relatively easily installed, leading to faster construction.
- Gives ease of quality control as insulation coverage is clearly visible.
- Proprietary systems are often independently tested and certified for use in particular situations.
- When installed by an approved contractor, proprietary systems can be covered by a company guarantee.
Advantages for refurbishment applications
- Gives major aesthetic improvements.
- Renews ageing exterior fašades.
- Lowers maintenance costs.
- Limits disruption to the fabric of the building.
- Some systems can help strengthen the existing structure.
- Increases life expectancy of buildings.
- Increases the value of the property.
- Can help upgrade the property to a mortgageable standard.
- Avoids internal building works.
- Can be installed during occupancy.
- Does not reduce the size of rooms.
- Larger amounts of insulation can be added externally.
- Contributes to elimination of internal problems, such as damp, condensation and mould growth, when accompanied by controlled ventilation.
Advantages for new build applications
- Simplifies construction, particularly when avoiding thermal bridging and achieving airtightness.
- Easily achieves high levels of insulation without increasing the size of the structure. Reduces labour and materials used, leading to a good value construction.
- Usually eliminates the need for a vapour barrier, as the dew-point is transferred to outside the structure.
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Marsh Barton Ind. Estate