This article explains how to fix a leaking metal roof with Rubba-Roof
Metal roof sheeting takes two main forms. One is the older style of small profile, corrugated ‘tin’ that has been used for nearly two centuries as an economical roof covering for agricultural buildings and rustic dwellings. The second is the larger pressed profile sheeting that is regularly used for roofing large industrial buildings.
Leaks in older corrugated iron most often develop due to fixing nails coming adrift or through the rotting and loss of the pinch-washers that should sit under the nail heads. Rusting of the ridge cappings and overlap edges are also frequent culprits.
Modern metal roof cladding is given factory applied coatings as a protection against corrosion and ultra-violet (UV) degradation. However these coatings have a limited lifespan and will lose their protective capabilities.
It is quite common to see badly “frayed“ edges on large profile metal roofing; also leaks can be caused by the deterioration of the metal at the ‘raised seam‘ overlaps. Water can be driven under the seam and will find its way into the reversed runner-seam that lies under the pressing.
Another example of weather damage that is often seen is the loss of the leading edge overhang that should ensure that there is effective water run-off into the box gutters: the result can be water being shed back into the eve voids onto supporting purlins and trusses and then into the interior of the building.
Remember to remove all loose rust and old flaking paint or coating before applying Rubba-Roof compound to the metal roof sheeting.