Essity
Pybelles Building, Prudhoe
Roof Cladding
12 Weeks
Replace the existing single skin, metal sheeted roof and rooflights with a new built-up system incorporating 240mm insulation, new gutter lining and external downpipes along with all flashings and trims.
The client had several issues with the existing single skin metal roof. They wanted to improve the thermal values of the building, as well as eradicate the issues they had with water ingress. Further down the line the client expressed an interest in potentially installing PV panels to the new roof area. The building was required to stay operational throughout the project duration, so communication with the tenant was imperative.
A plain safe net/debris net system overlay, beneath roof was installed, in accordance with the recommendations of EN1263-2, by using a mobile telescopic boom. All connections were knotted around primary truss members, temporary support ropes or other suitable anchorages.
Scaffold edge protection, access and top board lift independent at the eaves of the roof was erected giving safe and easy access to all areas of the roof.
We progressively removed the existing metal profiled sheeting & GRP rooflights, lowering to ground and clearing from site.
We then supplied and installed to the existing roof structure a double skin insulated roof construction to give a U value of 0.18 W/M²K comprising of a profiled steel liner sheet 0.7mm thick, fixed to the existing purlins with self-drilling screws. With all end and side laps sealed and taped to provide a vapour check. Lightweight galvanised steel ribbed support bars with snap in brackets were secured through the lining panel into the main structure with carbon steel self-drilling screws. The metal liner panel was overlayed with 240mm glassfibre insulation. The external roof sheet was a 0.7mm thick x 34mm deep profile, galvanised steel, coated on the weather side with an embossed Plastisol PVC coating in goosewing grey with a standard grey wash coat to the reverse. The sheets were secured with nylon headed self-drilling fasteners and side stitched with nylon headed self-drilling stitchers. All end and side laps were sealed with butyl mastic sealing strip.
Approx. 195lm of gutter was cleaned out and overlaid with a 10mm Styrofoam board before a Weatherfast gutter liner was installed, all laps hot air welded with new stop-ends and outlets draining into existing rainwater pipes. All 6 external downpipes were removed and replaced with new 160mm PVC downpipes.
