[header] How to build a lean to [title] Check what the direction the wind is blowing. [step] You do not want to build a lean-to that's leaning in the direction of wind. Even if the wind is not blowing fast now, it could pick up later and topple your lean-to over. 
[substeps] The easiest way to check the wind's direction is to simply try to feel it. Close your eyes and turn your face until you can feel the wind blowing on you.