I am working to get some breeder pens done houses will be 4x4x4 in front need to know how much slope to give roof so that rain etc will drain away from pen. the run will be 4x8 and the house will sit on blocks so the pen will be a little shorter in front. I am also planning exterior nest and for one side of the house to be hinged for cleaning watering food etc. I can do these I plan on making about 5 or so so far I need to know the angle to put on the top 2x4 to get the best slope for drain off without losing to much head room. OK I can't explain it all that well here is a picture you will see what is missing. Any other suggestions please give them.