Exposed fastener metal refers to the visible screws or nails on a metal roof panel that aren’t covered by protective elements, like cap washers or sealants, leading to rust or corrosion over time. Granule loss happens mainly on asphalt-based roofing materials where the small, colored granules that protect the shingle surface begin to wear off, exposing the underlying asphalt layer. Both issues are often caused by normal weathering, poor installation, or aging materials, but can also result from hail damage, harsh cleaning methods, or exposure to UV rays. To check your roof yourself, safely use binoculars or a ladder to look for rust spots around fasteners or bare metal, and note if the roof looks dull or powdery, which suggests granule loss. If you can spot fasteners missing their protective caps or washers, or clear patches where granules have worn away, these are signs attention is needed before leaks or further damage occur.
While some minor checks can be done by homeowners, such as clearing away debris or wiping visible fasteners to check for rust, it’s usually best to call a professional roofer to assess and fix exposed fasteners and granule loss. When talking to a contractor, ask whether they will replace rusty or missing fastener caps with weather-resistant types and if they will inspect for and repair underlying water damage. Also, inquire how their repair methods may impact any existing roofing warranty to avoid voiding coverage. Professionals can safely reseal exposed fasteners or recommend replacing vulnerable panels and can evaluate how widespread granule loss might affect your roof’s lifespan and energy efficiency. Acting promptly can extend your roof’s durability and protect your home from costly leaks or structural issues down the line.