Beam deflection is an important factor in building and construction. Beam deflection is a measurement of how much a load places strain on a the beam it is supported by. There are numerous calculations and calculators to help an engineer or construction working determine beam deflection. Beam deflection is key in ensuring that the building materials chosen for a structure will be safely
. supported by the beams in place. Too much stress on a beam can result in a finished structure being unsuitable for use. You can find more information here: http://www.engineersedge.com/beam_calc_menu.shtml