Greetings, DIY fans. I need some help with a small DIY project... I'm covering over a brick passageway to waterproof a wood store. All I am building is a sloped cover made out of that clear corrugated plastic, which will sit on top of a wooden frame. The cover will be entirely within the passageway and will not overlap either of the two walls involved as they are too high. Wind whips down the passageway so the structure needs to be quite robust. That said, nothing will run down to floor level. The cover needs guttering to run along the downslope side (along one of the walls). My question is - how to fit the guttering. Either it sits above the spars that will support the sheeting and I will need to thicken the spars at the downslope end to run underneath the guttering, or it sits below the spars and I have to waterproof the spars at the point where water flows past them and down to the guttering. My feeling is that I am over-complicating this so am looking around for how people have tackled this problem... Any help?