Roof Refurbishment Works to Corrie Primary School, Manchester

Further to reports of longstanding and undiagnosed issues of water-ingress, Graham + Sibbald were appointed by Robertson FM (on behalf of Tameside Borough Council) to identify the source of the defects and provide an appropriate remedial specification to address the issues at Corrie Primary & Nursery School.

The roofs had suffered from ingress for a number of years with speculative liquid applied treatments being used to remedy the issues without any long-term success. Furthermore, excessive ponding and heavily blistered membranes were also contributing to the increased risk of ingress, with a legacy of issues collectively affecting the existing systems waterproofing integrity.


Graham + Sibbald were instructed due to our wealth of experience in the flat roofing industry and in particular, the discipline of defect analysis, which will ensure the source is correctly identified and the measures recommended for repair are appropriate and fully justified, both in reason and in cost.

As a result of our dedication to provide a very high service at a very good cost, we work with a broad spectrum of clients, including a number of leading names in the public and private sectors, representing a wide range of retained clients including Local Authorities, Inward Investors, Government Departments, Major Retailers and Industrialists, Licensed Trade Operators and Insurance Brokers via their Loss Adjusters, amongst many others.


A full condition survey was undertaken to multiple roofs of the property, identifying previous speculative repairs, blistered membranes and areas at high risk of ingress. Shrinkage, mineral loss and surface erosion were all contributing to the accelerated degradation of the existing system, leaving little choice but to fully replace the roof with a new high-performance specification.

We specified BMI Icopal's Noxite as an environmentally friendly roofing system, which uses the sun, wind and rain to transform harmful nitrogen oxides (NOx) into harmless nitrates. The product features a granular titanium oxide finish which, when activated by UV radiation from the sun, converts nitrogen oxide particles (carried by polluted air) into nitrates, which are then washed away by rainfall.

The result is a highly effective means of reducing a building's environmental impact, with Noxite continuing to work for the entire life of the roofing membrane. BMI Icopal confirm 'independent testing has proven that Noxite membranes can break down up to 90%of the NOx absorbed from the surrounding air within two months of installation and that these effects last the lifetime of the roof - which, over a 20-year period, the membranes may absorb and break down over 4 kilograms of NOx per square metre of roof.'


Specifying such a system not only provides the school with a robust roofing system for over over 20 years, it is also helping to clean the local air for the children and the building users.


Throughout the project Graham + Sibbald were able to provide a number of services to the client :-

  • Defect Analysis and Building Pathology
  • Design and Specification


The project was undertaken during the winter months with the school remaining in occupation throughout the project, which was subjected to a number of storms, with inclement weather from heavy rain, snow and frost complicating the construction phase of the project.


It is our responsibility as surveyors, specifiers and designers to ensure buildings are always protected with the appropriate materials, however it is not always possible (due to budgets and time constraints) to always specify the most sustainable solution. This roofing membrane provides an ideal opportunity to break that ideology and is a perfect product for clients and buildings to take advantage of sustainable solution that can reduce a properties environmental impact that can reduce a properties environmental impact at an affordable price.

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