Flashing is one of the most important components of metal roofing because it redirects water before it penetrates through a structure. So, when flashing is done incorrectly, it can cause leaks, moldy roofing, and structural damage. Besides incorrect installation, improperly attaching flashing can also decrease the longevity and effectiveness of your entire roof.
Flashing may seem simple, but installers can sometimes not get the spacing right or not fully covering the surface area, which might increase your metal roofing maintenance. In fact, flaws in the flashing, such as air bubbles, wrinkles, and chipping paint can also allow moisture to enter an attic, which may result in costly metal roofing repairs including mold, wood rot, and discoloration due to staining.
So, your roofer should be able to determine where flashings are needed, purchase the correct materials, and properly install them before winding up. Safe to say, an untrained installer can be a recipe for shoddy work that leads to leaks in your home and eventually rusting from the inside out. So, beware!