I get asked this question every day. How do I figure how many polycarbonate sheets and profiles do I need to build my greenhouse? I think the problem is that everyone tries to look at it as a complete project. The easiest way to do this is to break the greenhouse into sections. Figure one side of the roof, then multiply by 2. Figure one side wall, then multiply by 2. Figure one gable end and multiply by 2. Add these together and you have your complete bill of material. The following video outlines this in more detail for you. Please remember, if you cannot figure your own bill of material, how are you going to be able to figure out where to put the parts when you receive it? It takes just a few minutes to get a better grasp on polycarbonate installation. Just remember, don’t over think the process, and watch all of our videos in our Polycarbonate Glazing Tips playlist.