Made for the northern climate we generally install a .032 6" seamless aluminum K style gutter which is run off from a 15" wide coil.
We secure the gutter using heavy duty hidden brackets which are engineered with quality, strength and reliaibility to supply the support it needs with a clean look. Brackets are spaced no more that 24" apart for more durability. We then seal the all gutter seams using commercial grade sealant.
Downspout size typically recommended for this application is 3x4, 4x5 also available. The 6" gutter has 25% more rain capacity than 5" K style. Standard colors are white and brown. Custom colors available upon request.