Minimal Disruption for Pupils at St Clare’s School with Caltech UV Cold Applied Liquid Waterproofing

Posted by david.luukas

St Clare’s School in Derby required a roof refurbishment to tackle the existing problems with their current roofing system. The existing roof showed signs of general aging and did not include thermal insulation, also the out-dated fragile rooflights needed upgrading.

St Clare’s needed a flame-free solution that provided minimal disruption to learning hours but also provide a highly durable system that would provide long lasting results and improve the thermal efficiency of the building.

Caltech Cold Applied Liquid Roofing System St Clare's School


A full 1,400m2 warm roof solution was installed to vastly improve the overall U-value of the building along with new Alumasc over-sleeve rooflight units, replacing the old Georgian wire rooflights thus providing the school with a bright internal outlook. U-values were also improved further due to the rooflights multi-skin UPVC design. This roofing system consisted of Alumasc PIR Insulation, Euroroof Self Adhesive Preparation Layer and finally, the Caltech UV Base Coat and Top Coat – providing the ideal solution, tackling the various, complex detailing with this project.

The roof construction is a “Clasp” type construction; popular throughout the 60’s in educational buildings.
The “cranked” construction presents limitations in terms of drainage therefore large areas of ponding water were also located during the initial survey. The Alumasc engineered solution worked with the existing design falls, Alumasc redesigned the gutter details to provide effective drainage to the main field area with specific locations of cut to falls insulation to overcome localised deflection & back fall.

Following installation, the building now achieves a u-value of 0.18 W/m2K as outlined in current Part L2B Building Regulations. Alumasc Hoppers, GX Gutters and Roof-Pro ProDrain products were also installed to improve the flow of water from the roof and work in synergy with the new tapered roof scheme.
The project demonstrates a fully engineered solution; enhancing the inherent design fall to provide a cost effective long term solution.

Caltech UV has an extended life cycle due to its enhanced UV resistance and is highly adapted to cope well when exposed to sunlight thus avoiding UV Degradation. Caltech UV cures to form a seamless, durable and weather-resistant waterproofing solution. For added peace of mind the St Clare’s School was also issued with an Alumasc 20-year warranty.

For further product information about Alumasc’s Caltech Liquid Roofing Range click here or call our technical team on 03335 771 500.

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