March 2004


A large classroom block at Bramhall High School is now leak-free and sporting an attractive new duo pitched roof thanks to Ash & Lacy's, Ashjack over-roof conversion system. The existing flat roof had reached the end of its design life a number of years ago and an internal drainage system was compounding the problem further as it was not providing an effective mechanism to remove water from the roof. A range of refurbishment options were considered, but a flat to pitched conversion was the preferred choice by all parties involved as it provided a permanent solution to the problem. The lightweight framing system was installed by Hi-Spec Cladding & Roofing in conjunction with Structural Engineers Atkinson Peck, and then over-clad with insulated composite panels to achieve a U-value of 0.25 W/m²K in line with current Building Regulation requirements.

As there was limited structural support available, an Ashjack full spanning truss system was selected and designed in three separate sections to sit on the external perimeter wall and two central corridor walls. The individual trusses were delivered to site, positioned on steel stills and then fixed to the existing building structure using an appropriate fastener system. The drainage was moved to the outside of the building, which together with the roof pitch created, eliminated the potential for any further problems. By opting for this type of refurbishment, the opportunity was also provided to upgrade the thermal performance of the roof, which can significantly reduce heating bills and energy consumption, which in turn lowers the running costs of the building and reduces CO2 emissions.

Ashjack over-roof conversion systems are constructed using a bespoke lightweight steel framing system, which is primarily designed to create a roof pitch. Offering a permanent solution to failed flat roofs they can be used to construct a variety of pitched or curved roof structures that incorporate ridges, hips, valleys soffit/fascias and overhangs. A range of systems are available, which can be individually designed and tailored to suit the specific structural and design requirements of the existing roof. The lightweight structural metal frame system has an excellent strength to weight ratio and can support both modern and traditional over-cladding systems to achieve the required aesthetics.

Commenting on the selection of an over-roof conversion system James Dickinson of Atkinson Peck said:

"There were serious problems with the existing flat roof so some type of refurbishment work had to be carried out. All refurbishment solutions were considered but it was decided by the parties involved that an over-roof conversion system was by far the most appropriate option".

Developed by Ash & Lacy in 1988, Ashjack was the first structural lightweight over-roof conversion system in the UK. Quick and simple to assemble, Ashjack has provided a permanent refurbishment solution on buildings throughout all sectors of the construction industry. From a commercial point of view the life of the building is considerably extended, maintenance is reduced and the upgraded aesthetic properties add additional value to the property. Supported by a network of approved installers Ashjack is available in a range of systems, which include a clear spanning option that is designed for use on buildings where the existing roof is suffering from severe structural degradation.

Ash & Lacy Building Systems are one of the UK's leading manufacturers and distributors of cladding products and accessories to the construction industry. The extensive product range includes the recently launched Ashzip standing seam roofing system, the industry standard Ashgrid spacer support system and the Ashjack lightweight structural frame for flat to pitch roof conversions. The company also offers a comprehensive range of Ashfab bespoke fabrications, Ashflow rainwater goods, Ashfix fasteners & accessories together with the Ashtech rainscreen cladding range.