What Is Flashing?
Manufactured either using the metal material or a rubber membrane material, flashing is a part of the system that prevents water from getting into the holes build in your roof. All roofs have perforations which means a number of openings or holes in the roof surface which permits for elements like skylights, chimneys, passages, and vents. These necessary holes in the roof can turn into an entry point for moisture if they’re not sealed properly.
To keep the roof secure and sealed off from moisture, ‘flashing’ acts as the barrier that’s placed around perforations.
Materials of Flashing
Usually produced from a metal like painted galvanized steel, stainless steel, zinc alloy, aluminum, copper, terne metal, lead or lead-coated copper, flashing can be produced by many different materials. For non-metal flashing, there is available produced from plastic sheet material or bituminous fabric.
Installation of Flashing
Extra care should come first to protect the flashing from opposing with other roofing materials when installing flashing. Galvanic corrosion is likely to happen, which will cause rust stains and metal decay once metal flashing comes into contact with metal roofing materials.
Flashing is installed relatively late in the plot of roofing construction. Roofing felt or some other type of impermeable membrane is installed, with holes made to lodge for any penetrations that will occur once the roof frame is positioned.
Flashing is then secured using a nail or staple into place on every side of the penetrations. It is then sealed the gaps between the penetration and the flashing, including space between the impermeable membrane and the flashing. For the gaps, materials like glue, caulk or waterproof cement are utilized to seal it – which possibly interact with metal roofing and corrosion is formed. Preferably, after flashings have gone in, roof cladding is then installed.