Sized for the roof above
Worked out from the catchment area and the pitch, which decides section size and how many downspouts a run needs.

A gutter is the last six inches of a roof. Undersized, badly hung or emptying at the foundation, it undoes the rest of it.
Five-inch gutter on a steep slope with a long run will overshoot in a real downpour no matter how clean it is. People blame leaves for years when the actual problem is that more water arrives per minute than the section can carry.
Worked out from the catchment area and the pitch, which decides section size and how many downspouts a run needs.
Rolled on site to the length of the run, hung on hidden hangers at proper spacing with a real fall to the outlet.
Enough of them, and emptying far enough from the wall that the water is not simply returned to the foundation.
Soft or rotten fascia behind an old run is replaced before the new gutter goes up, rather than screwed into.
On a wooded lot a good guard genuinely reduces how often a run needs clearing. On a run that overshoots because it is undersized, a guard changes nothing and hides the fact that it is still overshooting. Worth fitting after the sizing is right, not instead of it.
A full tear-off planned around the frontage first, so four tons of old covering leaves the street without closing it.
Read the page →Local repairs done properly, with a straight answer about whether the roof is worth repairing at all.
Read the page →Tracing a leak back to where the water actually enters, which is rarely above the stain.
Read the page →A documented look after a blow, with the damage photographed in a form that is actually usable.
Read the page →An hour above the deck and below it, ending in a plain written verdict on the covering and its remaining years.
Read the page →Walls and trim fitted by the people who did the covering above them, which is how the flashing between the two ends up right.
Read the page →The runs measured, the falls checked and the discharge points written down.