How to Replace Guttering

Remove the existing guttering by snapping it out of the supports. If the supports are metal hangers, take extra care due to their weight. If the hangers holding the guttering in place are damaged, remove them by removing the screws that hold them in place with a screwdriver or, if they are too rusted to remove that way, by cutting them with a hacksaw.

Mark the high spot of the gutter system with the pencil. The high spot will be high up on the fascia board just under the roof line, at the other end from the downpipe.

Calculate the angle at which the guttering will run down from the high spot to the downpipe. For every 10 feet of length, the gutter should slope down 1/4 inch. Snap a chalk line at this angle to use as a reference.

Replace any gutter hangers that you had to remove by screwing in new ones. You will need to drill new holes to screw into; be sure to fill in any old ones to prevent water from seeping in through them. An all-purpose masonry filler will be adequate, as long as you make sure that the hole is completely filled. The gutter hangers must be no more than 2 feet apart along the length of the whole gutter, but remember to leave room at the ends for the gutter caps.

Cut the gutter into sections. Ideally it should run the full length between the high spot and the down pipe, but if the line is particularly long, you may need to cut it into smaller, more managable lengths.

Hook the sections of gutter over the clips and snap into place. Position one end in the down pipe and use connectors and corner pieces to attach the sections of guttering together. Apply mastic or caulk to any seals to strengthen them.