During the specification process, Justyn identified 3 key areas on the roof that would benefit from a unique mix of standing seam metal and bituminous membrane waterproofing systems to perfectly match the demands of the varying roof pitch gradients.
To give the best possible aesthetics for the building, Garland’s R-MER LOC metal standing seam roofing system was specified, providing a sleek architectural finish, whilst delivering optimum results against wind uplift, thermal performance, impact resistance and fire standards.
Approved Contractor Stay Dry Roofing was appointed for the works, starting with the removal of the existing tiles, battens and sarking membrane from the site. A supporting timber deck was added to the structure before laying a fully bonded bituminous VCL to the newly installed timber decking to ensure the building was fully watertight.
To improve the thermal efficiency of the building as part of the refurbishment process, a 1.6mm galvanised C-Profile was mechanically fixed to the deck across the eaves and verges prior to the installation of the insulation. The height of the C-Profile was set to match the depth of the 120mm insulation, which allowed for the face fixing of the retaining brackets, fascias and gutter inlet sheets. Through the combination of the timber deck, VCL, 120mm PIR and R-MER LOC, the insulation upgrade achieved a much improved 0.18 w/m2k, in line with current building regulations.
The aluminium R-MER LOC system comes with a high degree of prefabrication, with no mechanical folding or zipping required, making the system fast and simple to install. As well as the excellent appearance of the R-MER LOC, the choice of the system also allowed the reinstatement of the PV panels without penetrating the roof as they could be simply clamped to the seams.
On the flat sections of the roof, the StressPly Flex system included a tapered design using 120mm flat board PIR, to upgrade the thermal efficiency of the roof, whilst ensuring water can be channelled directly to drainage outlets, reducing the risk of standing water.
The Safe 2 Torch StressPly Flex system was used around the hall and any areas that couldn’t be seen from the ground, to ensure a fully bonded system could be created, with no chance of water backing up and under the tiles or the new metal system.
To improve the width of the gutter and water flow outlet points StressPly Flex was also installed onto new plywood, with renewed outlets to ensure the largest aperture possible, safeguarding the school against debris blockages in the future.