Seamless gutters are rolled on site the same morning we hang them, so there are no joints to open up and leak two summers from now. We size the run and the downspouts to the roof above them, hang everything on hidden hangers and route the water far enough out that it leaves the slab alone. Six inch is standard on most Austin homes with a steep roof. You get the price per foot before we start, and the old gutter leaves with us.