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Deflection
Deflection is a word used to describe how much a structural member will bend while it bears heavy loads.
This may seem like a nice this to know about, but not be all that important. Deflection is one of the main criteria
used to design floor and roof support systems. If there is too much deflection in a floor, rather than have a nice
solid floor to walk upon, you end up with more of a wooden trampoline. High levels of deflection could also ultimately
lead to the floor joists suffering from extreme fatigue. A bouncy floor or roof would also
affect anything covering it. Floor tile or wood floors could crack; plastered or painted ceilings could crack. Leaks
could begin to occur if there is a heavy snow load on the roof.
There is always some sort of deflection in a floor or roof system. Sometimes is it small enough to be not worth noting,
but it is there. In most cases, the deflection is known, noted, designed so that it is within building code specifications.
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