Jablite, in partnership with Innovate UK, undertook an experimental project to improve the thermal performance of a school building in Kent – and to look at whether there might be wider applications.
The school, The Hundred of Hoo Academy near Rochester, boasts several buildings: but the focus here was on its English and Humanities Building, a single storey construction dating from the mid-1970s. The project, which saw Jablite installing Dynamic Roof and Dynamic External Wall Insulation, aimed to reduce the building’s energy use.
"Jablite Dynamic insulation provides both insulation and heat recovery and also improves ventilation within the building. This gives improved thermal insulation (reduced U-values) and increased carbon saving in addition to reducing the risk of condensation and improving the air quality within an existing building."
|Job||Installation of Jablite Dynamic Flat Roof and External Wall Insulation in school building trial|
|Contractors||Avonside Letchworth Roofing, Beaumont Facades and Kerry Smith Ltd|
|Site||The English and Humanities Building, Hundred of Hoo Academy, Hoo St Werburgh, Kent|
|Product details||Dynamic Roof Insulation and Dynamic External Wall Insulation including mechanical heat recovery, ventillation systems, ducts, flow diverters and fan units|
The aim of this project was to measure the extent to which energy use could be optimised by improving the building fabric, while also providing a low-cost method of enhancing the quality of air in classrooms.
The English and Humanities Building at Hoo features 24 classrooms, an open canteen area, several staff rooms and a general administrative office. In total, 50 staff and 500 pupils could be in the building at any time. Dating from the mid-1970s, it’s a single storey structure of modular construction with a light steel frame supporting a flat, profiled metal deck roof. The walls are a mix of pre-cast concrete panels and full height glazing. Prior to the project the walls had no insulation.
Parts of the building are cold and draughty in the winter, hot and stuffy in the summer. Poor quality of air can make it hard for children to concentrate.
Jablite wanted to prove that its Dynamic Insulation System, installed on the building’s roof and walls, could make a significant difference.
Jablite Dynamic insulation provides both insulation and heat recovery and also improves ventilation within the building. This gives improved thermal insulation (reduced U-values) and increased carbon saving in addition to reducing the risk of condensation and improving air quality.
Heat is lost through all elements of a building and is expensive to replace through the heating system. Insulation material with a low thermal transmittance is used to line these elements to slow down the rate of heat loss. Our Dynamic Insulation system captures residual heat leakage, uses it to warm the ventilation air and then directs it back into the building. This provides an apparent improvement in the U-value of the walls, reduces the energy required in the heating system to maintain the required internal temperature and also improves the air quality in the building.
The insulation is a two-part moulding in premium expanded polystyrene assembled into a 1200mm x 600mm x 100mm board. Air flow channels are moulded into one face of each component part so that a ventilation channel is created within the assembled product. Air enters the insulation through a ventilated base rail on a wall or chimneys on a roof and can enter the building through duct connections at suitable points to link to the mechanical ventilation system.
This project will provide valuable data on combining ventilation and insulation into a single package, applicable to all forms of non-domestic buildings.
Jablite Dynamic insulation is the only product on the market that both insulates the building fabric and acts as a renewable energy source by re-using escaping heat energy to pre-warm ventilation air. It also has the possibility to capture solar radiation acting on the external walls of a building to further pre-warm the air – this has been shown in new build trials to create a negative wall U-value.
Education and offices have been identified as significant targets with large stocks of poorly insulated buildings.