Tower Machine Tools Ltd of Eastleigh Hampshire has an enviable reputation for the supply and future maintenance of high quality machine tools to the engineering industry, so takes pride in maintaining the highest quality standards. When leaking roofs over their offices and works were threatening to tarnish this high standard they looked to Les Bryant at National Roofing & Cladding Ltd for some solutions. Whilst the existing sloped fibre cement roof simply needed over roofing, the front felted roof and adjoining lean-to roof needed a more radical solution.
The felted roof was supported on wood wool slabs laid over a series of cranked steel beams at around 3 metre spacings with a suspended ceiling beneath, whereas the adjoining lean-to roof was at a different level but needed to be incorporated into the scheme. Les spoke with Paul Garrow at Advanced Cladding who suggested the ROframe light gauge steel “flat to pitch” structure so that a new sloping roof could be installed over both the existing felted and the lean-to roof in one simple design.
Once the scheme had been developed and had client approval ROframe consulting engineers produced the necessary calculations and the work was commenced.
This view shows the main felted roof along with the lean-to roof off to the right and the fibre cement roof at the rear.
After removing the loose chippings from the felted roof, the location of the existing cranked steel beams was established and the ROframe base members securely fixed over them to ensure transferring the new roof loads directly into the beams below.
Erection of the first “tilt frames” over the base members then commenced and temporary bracing fitted to hold them in place until the structure was built. Also shown in this view are packs of the standard length ROframe section.
Here see the ROframe structure in place along with the tilt frame bracing and deep section purlins spanning between the tilt frames. The ROframe props have been accurately cut to length with the hand operated site cropping tool and fixed in pairs to adequately support the load from the long span purlins.
The adjoining lean to roof has been fitted with ROframe structure at the standard 1500 spacings with the base members secured to the structure beneath and the tilt frames accurately set to match the slope of the new main pitched roof.
Completion of the ROframe structures and fitting over of the new roof sheeting has resulted in a clean, simple roof design incorporating the small “lean to” roof beneath and complimenting the new works roof beyond.
The new roof is finished off with flat composite sheeting plus contrasting flashings and gutters to the perimeter.