What is Roof Flashing and why is it Necessary?
A complete flashing system needs to be installed during construction. This system intercepts, collects, and discharges moisture or water back onto the roof stormwater drainage system. Apart from malleable flashing which is fitted on site, roof flashing should be purpose made and machine folded, of material that is compatible with all of the materials used in the stormwater drainage system. The waterproofing of roofs is vital to maintain the structural integrity of the building. A defective roof flashing system is a common cause of water penetration into a roof. Also, masonry walls can be porous, absorbing moisture, coupled with capillary action, can allow moisture to penetrate into internal surfaces. In these cases, flashing is needed in order to redirect the moisture back out to external surfaces. Common spots for water penetration on roofs for exterior walls are where surfaces intersect. These include where dormer walls and the roof join, around skylights and chimneys, and in roof va
