Seamless gutters, today’s most popular type, are extruded from metal “coil” stock, using a special machine that’s brought to your home by a gutter fabricator.

As their name implies, they don’t have potentially leaky seams along their lengths; this is their biggest selling point. The lengths join to inside and outside corner components and downspout outlets. Seamless gutters are usually formed from aluminum that has a baked-on finish, but they may be made from copper or factory-painted steel. Nearly any length of seamless gutter can be extruded.

Inside a van, flat aluminum stock is fed into a seamless gutter extruder.	The extrusion machine inside the van produces a perfectly formed gutter.
Nearly any length of seamless gutter can be extruded.