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Last edited 03 May 2018
External Wall Insulation - Case Study
Location: Alloa, Clackmannanshire, Scotland
Size: 105 Houses / 10,000 m2
Clackmannanshire Council are currently carrying out necessary refurbishment and upgrading of its social housing stock. Through cyclical maintenance inspections and stock condition surveys 105 properties were identified as being constructed from Wimpey No-fines concrete.
These property types have no wall cavity and therefore no insulation, resulting in an extremely poor thermal U-value of just 2.1 W/m2K. The properties were also very unsightly having had no external maintenance for many years.
Through the Housing Capital Improvement Programme, Clackmannanshire Councils objective is to maintain its housing stock in the best possible condition and to ensure that every household has access to good quality and affordable homes that meet their needs. Providing insulation to improve the thermal performance whilst also improving the appearance of these Wimpey No-fines properties were the priority.
 Design solution
The contractor, working on behalf of the council, specified an External Wall Insulation (EWI) system incorporating Stylite PlusTherm Expanded Polystyrene (EPS) insulation boards. These lightweight boards measuring (L)1,200 x (W)600 x (T)90, were mechanically installed over the existing façades.
 Key benefits
- Excellent thermal performance
- High compression and tensile strength
- Minimal water absorption
- Cost effective
The external wall insulation system achieved a low U-value of 0.3 W/m2K to meet current Building Regulations. This level of thermal performance resulted in reduced energy usage
and lower energy bills for the residents.
“We like to use Stylite EWI boards whenever we can as EPS is cost effective, yet durable, lightweight, and completely recyclable. We worked closely with SPI to select the best product for the job and to ensure it provided the necessary insulation value.” - EWI System Designer.
 Related articles on Designing Buildings Wiki
- Beam and Infill Suspended Floors.
- Beam and Polystyrene Block Suspended Flooring - Case Study.
- Insulation for ground floors.
- Profiled and cut to fall roof insulation - case study.
--Styrene Packaging and Insulation Ltd 12:27, 10 Apr 2018 (BST)
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