Usually this happens after a period of years.
Roof shingle granules in gutter.
However when this begins to build up over a period of time passing water is slowed and other particles collect in the grains.
It is typical for granules to shed from the roofing and deposit down into the gutter.
Asphalt shingles are so heavily coated with these minerals that some fallout is completely normal.
Why shingles leave granules in your gutters.
Granules naturally separate from shingles over its life.
Shingle sediment is made up primarily of sand like granules or grit that separate from asphalt shingles and other small matter that sticks to the roof surface and washes into gutters.
This is especially true if your roof is brand new.
Are you getting roof granules or a sludge in the gutter.
Normal mineral granule loss on a new asphalt shingle roof granule loss on a new asphalt roof loose mineral granules wash down the roof and will appear in gutters and at the ends of downspouts.
As any homeowner will tell you however gutters can be filled with all kinds of debris including granules from your roof s shingles.
The gutter is quicker to overflow.
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You can begin this roof condition assessment at the ground before even looking at the roof itself.
If you see granules in the gutter it might be a sign that you need a new roof so you should not hesitate to call a professional roofing contractor when you see granules shedding from your roof.
It seems to be most prevalent early and later in the shingles life.