You can do this by mounting a gutter hanger.
Rain gutters on dormers.
Runoff from the dormers will slowly erode granules of the main roof at the dripline especially where the dormer eves are highest and runoff falls the farthest before hitting the main roof where runoff will.
In this first picture one can see.
It is very common for dormers and other roof structures that have gutters above the level of the gutters on lower portions of the roof to empty onto the roof surface.
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The dormers are gable type having 3 visible fascias and do not have gutters or downspouts.
Now that you know how to clean out gutters be sure to add it to your to do list at least once a year.
Once the gutters are clear repair any sagging metal.
Should the dormers have gutters and downspouts.
Once you get the hang of it gutter cleaning isn t that bad and you ll feel great when it s done.
Leaving gutters off altogether may not be the wisest idea because the rain dripping off of the edge will wear on the roof below it.
Gutters are open at the top to catch rainwater flowing off the roof directing it into the downspouts.