A french drain is a system for eliminating excess water from the soil.
Gravel in gutters.
The loss of granules will stop and it s no reason to worry.
Reverse curve gutter guards are made of a curved piece of thin metal that directs water into the gutters and everything else onto the ground.
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.
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.
You may see an influx of granules in your downspouts after a storm.
The classic french drain is simple just a trench filled with gravel with sand on top.
You can begin this roof condition assessment at the ground before even looking at the roof itself.
Bottle brush gutter guards stand up inside the gutters and collect debris.
It allows excess water to percolate.
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Granules naturally separate from shingles over its life.
Watch this short video to learn exactly why.
This could be caused by heavy rains or hail that beat on the roof and loosen the granules.
These are good for directing away large debris but they will not catch sand dirt and shingle sediment.
It seems to be most prevalent early and later in the shingles life.