R wannabe wrote:The other problems are weight and installation. Guttering is not made to handle that much weight and the bracketry doesn't always work with greenhouse framing very well.
My solution to this was to suspend them with ropes wrapped around the front, bottom, and back of the gutter every 5 feet (that is, 3 ropes for a 10-foot length of gutter). I was able to support three gutters full of soil this way, one above another, from three hooks on the garage eave. I was thinking that if I mounted them against a wall next time, I would use boards supported at top and bottom (that is, resting on the ground and attached to the eave above), and nail or screw the gutter to the wall on back side and to the board on the front. Or alternatively, screw horizontal supports between the wall and the vertical boards, and just rest the gutters on these supports, with the wall and boards preventing the gutters from splaying out with the weight of the soil.