Re-Roofing at Medina House School
Medina House School educates 104 children aged between two and eleven with Special Educational Needs. The main 1970s school building is traditional load bearing brick and block construction and is managed by Property Services, on behalf of the Isle of Wight Council.
The Isle of Wight Council approached HCC Property Services to investigate the leaking single ply membrane flat roof to the 1992 extension. The roof contained a row of pitched patent glazing running the full length of the building. In addition to the roof leaks, the school were experiencing internal overheating issues, and the client wanted to reduce the thermal gain as part of any roofing works.
The proposal was to install a high-performance warm roof three layer felt system and upgrade the insulation to exceed the requirements of Approved Document L and futureproof the building and improve the energy efficiency.
Our Property Services CIBSE Low Carbon Consultant and Principal Mechanical Design Engineer produced a dynamic thermal model of the building to demonstrate how the pitched patent glazing was contributing to the overheating issue. We used the data from the thermal model to report on the impact of the proposed design solution in terms of overheating and daylight.
The new patent glazing design was a passive ventilation system which involved maintaining and refurbishment of the existing structure. This complied with the requirements relating to overheating in BB101. The project involved the installation of 26 solar treated double glazed units on the north elevation, of which only 10 were openable units and 78 solid insulated powder coated aluminium panels.
Location: Newport, Isle of Wight, PO30 2HS
Client: Isle of Wight Council
Value: £405,000
Project Team: £6,750,000
Programme Commenced: Hampshire County Council (HCC) Property Services: Building Surveyor, Mechanical Engineer, Electrical Engineer, Structural Engineer, CIBSE Low Carbon Consultant and Principal Mechanical Design Engineer. Contractor: MCM Construction Ltd
Project Lead: Lee Purkiss, Building Surveyor
Key Benefits:
- The high-performance warm roof three layer felt system resolved the roof leaks and included a twenty-year product and workmanship guarantee.
- Upgrading the roof insulation allows for future installation of renewable generation technology.
- Thermally efficient building with passive ventilation system to control overheating issues.
- Ten openable vents linked to actuators which open/close when activated by temperature controls with manual override.
- Traffic light control monitoring informs the school when air quality (CO2) levels rise, and when to manually open doors to provide fresh air.