Having never built one before i wonder if someone could shed some light onto the actual construction of a box gutter system or the best way to go about it at least, the space i have to work with is 8 inches wide by 3.6 meters long i guess it would be with timber, ply and lead but i have no idea of the drop or how to seal it, as once constructed it would be be difficult to access it again I've looked at the aluminium ones but the prices are more than silly ...thanks
