Slate and granule loss refers to pieces of slate tiles or asphalt shingle granules coming off the roofing surface. Slate is a natural stone that can sometimes flake or break if it’s old, improperly installed, or exposed to severe weather like hail or strong winds. Granules on asphalt shingles act like a protective layer against UV rays and physical wear; when they come loose, it usually signals aging shingles, storm damage, poor quality materials, or improper installation. You may notice granules piling up in gutters or downspouts, or exposed black felt beneath thin or worn shingles. Regularly walking your roof isn’t safe or recommended, but you can look for granule loss around gutters, or check the attic for light showing through worn shingles as simple DIY diagnostics. For slate, watch for cracked, chipped, or missing tiles, and any increase in interior leaks.
If you do find granule loss or damaged slate, it might be tempting to try quick fixes or patch jobs yourself, but roofing materials can be fragile and warranties may be voided if repairs aren't done properly. For minor granule loss with no leaks, adding protective coatings often won’t extend roof life much, so replacement might be the better long-term solution. With slate, individual tile replacement is often possible but needs skill and the right materials. Call a qualified roofing contractor if you see persistent leaks, widespread granule loss, or multiple broken slates. When talking to a roofer, ask whether they will use matching slate or shingles and if their repair will affect your existing warranty. Also, inquire about the expected lifespan of the repair versus a full roof replacement to help you make a cost-effective decision.