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 the name implies, seemless gutters do not have potentially leaky seams along their lengths, which is their biggest selling point. Instead, 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.