Normally confirm the maximum load capacity for each bay and for every shelf to circumvent overloading also to comply with OSHA and native creating code polices. For specialised stock for instance cantilever racks for prolonged products, or thrust-again racks for deep lane storage, pick structural elements scaled to anticipated weights. http://apps.lonestar.edu/blogs/debuell/mercer-park-blue_flowers1/#comment-21810