Meridian High School

Bauder Total Roof System PLUS with Bauder structural rooflights


Meridian High School is a coeducational secondary school with academy status, located in the New Addington area of the London Borough of Croydon.

Bauder Building Board

Project: Meridian High School
Location: Croydon
Project type: Refurbishment
Roof size: 2046m²
Specifier: Daniel Connal Partnership
Building owner: GLF Schools
Approved contractor: Skyler Contracting Limited

The specification

Bauder area technical manager, Chris Clarke, carried out a condition report on the flat roof areas that were causing concern. Core samples were taken from various locations of the roof. They identified that areas of the deck were damp, confirming that the waterproofing was failing there. A visual appraisal showed that several of the roof areas had substantial greenery growing on them and detritus that was, in some instances, blocking the guttering. The roof surface was showing typical signs of ageing such as surface oxidisation, cracks, splits, blisters, rucks, and laps coming apart.

The thermal performance of the existing roof build-up was poor and well below current standards. One of the risks associated with inadequate levels of insulation is the potential for condensation to form within the structure or waterproofing system during periods of climatic extreme. The insulation on this project would need to be upgraded to meet current Building Regulation requirements.

The survey confirmed that the existing waterproofing on much of the building had come to the end of its service life and needed refurbishment before a serious failure occurred. The proposal for renovation included upgrading the insulation, replacing the rooflights and increasing the upstand height around the glazing.  


Products applied

Bauder Total Roof System PLUS
Fully integrated bituminous roof system, featuring the most advanced bitumen membrane currently available, BauderKARAT.

PIR insulation in a variety of thicknesses to achieve the required U-value for the school. Ideal where weight loadings may be a consideration.

Structural rooflights
Modern thermally efficient structural rooflight, and kerbs were raised where necessary to create a minimum upstand of 150mm.


System installed

Bauder Total Roof System PLUS

1 BauderKARAT cap sheet 5.2mm thick dual modified APP/SBS, torch applied bitumen cap sheet offering the ultimate waterproofing solution.
2 BauderTEC KSA DUO 35 Underlayer A self-adhesive elastomeric bitumen underlayer.
3 PIR FA-TE insulation BauderPIR FA-TE Insulation was used on this project to upgrade the thermal performance of the building to meet current standards. Various thicknesses were used on the different roof areas.
4 VB4-EXPAL This robust bitumen AVCL provides temporary waterproofing once laid, ideal for refurbishing a dilapidated roof.