by Nathan Stout (of AccordingToWhim.com)
I basically made the lean-to 8x12 using three pieces of plywood laying long-ways from the side of the shed. This would also require two 4x4's for the main legs, two 2x6's for the front and back parts, and 4 2x4's for all the other pieces. Most of the lumber isn't too expensive until you come to the plywood. That stuff is very expensive. One piece of 8'x4' plywood (the thinnest, cheapest one) was $17. I decided to go cheap and skip the plywood and I bought pressboard. You know that stuff that looks like it is made of wood chips all smushed together. It's $5 a 8'x4' sheet so it cost less for three pieces of that than it did for one normal piece of plywood. There is a reason for that of course... pressboard is shitty. It can't get wet or it will start to come apart. Well since I was being cheap I decided to put metal roofing ontop of it. I got a shock there too since one 2'x8' piece was $28! Just to cover the 8'x12' roof it would be $168!!! Sheesh! No thanks. I decided to just use the pressboard and paint it thickly (to make it last a little longer) and save up money to get the metal covering one day in the future.