If you have a leaking flat or pent garage roof and are thinking about converting it to a pitched one you should be aware of what is involved. New steel trusses and purlins would need to be built to size, to fit the structure. These would then have to be fitted to the garage before the new fibre cement roofing sheets could be attached. The cost for this to be done would be considerable and could easily double the price of the job. In my opinion in most cases it is just not worth the extra cost, unless you definitely prefer the look that a pitched roof provides.
In fact, most flat garage roofs are not actually flat. They will be built with a slight slope to allow rain water to run off them easily. In addition, being constructed with the right roofing material makes all the difference. If full length galvanised, corrugated steel garage roofing sheets are used, there should be no problems with ‘overlapping’ areas. Areas of overlap can be places, where through time, water eventually penetrates and causes problems. These roof sheets are mounted on rigid galvanised steel rafters. I have been using this type of roofing material on flat garage roofs since 2010 without any problems. In addition, with this type of material most lengths and widths of garage can be covered. For maintenance free convenience, I usually fit them with specially profiled galvanised steel wrap around flashings or PVC angle verge boards.
If you need any help replacing your garage roof, please feel free to get in touch with us at Garage Roof Scotland. We are experts in garage roof repair and replacement and work throughout the whole of Scotland.