Florida Certified Roofing Contractor CCC 1334537
Why do I keep finding shingle granules in my gutters and downspouts?
A straight answer from a Florida certified roofing contractor — then what you can check yourself and when to call. Free quote: (954) 775-8990.
Shingle granules in your gutters mean the mineral surface of your asphalt shingles is wearing off and washing down with the rain. A small amount is normal, especially on a newly installed roof, but a steady or growing pile usually points to an aging roof, heat and UV wear, or storm damage.
What matters is whether the loss is tapering off or continuing. A new roof sheds loose granules left over from manufacturing in its first rains, and that settles down. On an older roof, granules that keep coming after every storm suggest the shingles are nearing the end of their useful life.
Why it happens
The granules are the armor of an asphalt shingle. They shield the asphalt layer underneath from sunlight, and they give the shingle its color. As the asphalt dries out and stiffens from heat and UV, it holds the granules less firmly. Florida's hot, humid climate and long cooling season speed up that aging, and near-daily summer thunderstorms rinse the loosened granules off the roof.
Other things can add to it: poor attic ventilation that bakes shingles from below, salt air near the coast, wind-driven rain, hail or debris strikes, heavy foot traffic on the roof, and pressure washing. Blistered shingles also lose granules where the blisters break open.
Once enough granules are gone, the exposed asphalt ages faster. Shingles can then curl, crack or lose their grip, and a leak left alone can eventually reach the deck. Your gutters and downspouts are only where the granules collect. The roof is the source.
What you can check yourself
Look at the amount over time
Scoop out what has collected and note how much builds up after the next few rains. A thin dusting is different from a handful at every downspout outlet.
Check the downspout outlets
Look at the ground where the downspouts discharge. Gritty, dark sand-like material there means granules are washing off the roof.
Scan the roof from the ground
Use binoculars from the yard and look for dark or bald-looking patches, curled or cracked edges and missing shingles. The slopes facing the sun are often the most worn.
Look in the attic
From the attic hatch, check for water stains on the underside of the deck, damp insulation or daylight where it shouldn't be. Note whether the attic feels extremely hot and stuffy, which can point to weak ventilation.
Check ceilings inside
Look for new yellow or brown stains, especially after heavy rain. Stay off the roof for all of these checks.
When to call a pro
Call for an inspection if granules keep accumulating, you can see bare asphalt or dark patches, shingles are curling or cracking, or there are stains on a ceiling or in the attic. A roofer can tell you whether a repair makes sense or the roof as a whole is worn out. We offer a free estimate and a written flat-rate quote that says what is included. You can reach us at (954) 775-8990, and the phone is answered around the clock.
On licensing, here is the rule as it stands: "Roofing work in Florida legally requires a licensed roofing contractor and generally a permit from the local building department; a contractor's license is verified on the Florida DBPR website." Our Florida Certified Roofing Contractor license, CCC1334537, is a state certification valid in every Florida county and can be checked on the DBPR site.
What a pro will do
- Inspect and give a written quoteWe look at the shingles, flashings and attic ventilation, then explain whether repair or replacement fits. The quote is a flat rate that spells out what is included.
- Tear off to the deck and inspect itIf the roof needs replacing, the old shingles come off down to the deck. Rotten plywood and fascia replacement are included in our scope.
- Install a new systemThat means a secondary water barrier where required, architectural shingles rated for Florida wind zones, starter strip, ridge cap, drip edge and valley detailing, along with ridge and off-ridge ventilation.
- Handle permits and inspectionsWe pull permits under our own license, schedule and pass the inspections, and close out the permit.
- Clean upThe job finishes with full cleanup, including a magnet sweep for nails.
Related questions
- Does a new roof shed granules?
- Yes, a new roof can shed some loose granules in its first rains, and that usually tapers off. If heavy loss continues well past the first few storms, or you see bare spots, have it looked at.
- Can granules be put back on the shingles?
- No, there is no practical way to restore them. Once the surface is worn through, the options are repairing isolated problem areas or replacing the roof.
- Can granules hurt my gutters and downspouts?
- They can build up in low spots and at downspout outlets, hold moisture and contribute to clogs. Clean them out as you find them, but the fix for the source is at the roof.
- Does poor attic ventilation cause granule loss?
- It can contribute. Excess attic heat bakes shingles from underneath and speeds up aging. We look at ventilation during an inspection, and ridge and off-ridge ventilation is part of our shingle scope.
- Is it urgent if I find granules?
- Not by itself. It is a sign to get the roof checked before the next heavy storm season, since a worn roof is more likely to leak or lose shingles in wind and rain.
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