Aluminium runs formed in one continuous piece at the kerb, hung on hidden brackets every sixteen inches, with downspouts sized to the roof area actually draining into them.
Sectional gutters leak at the joints, and they always leak at the joints, because that is where the sealant is. Forming the run on site removes the joints entirely. The part most contractors get wrong is downspout sizing: a long valley can dump the runoff of half a roof into one corner, and a standard downspout simply cannot take it. We measure the area draining into each run and size the outlet to match.
