A bevel can
represent anything from a 5° angle to an 85° angle. They're used to make
a transition and to ease into another part of the stairs or building.
The picture above shows a beveled piece of wood that
was nailed on top of a 2 x 10 post band. If you don't want water or
moisture to sit on top of a band of wood like this one, you will need to
angle or bevel it.
Without the beveled piece of wood, the morning moisture will accumulate
on top of the post band, seeping into any cracks or unpainted parts of
the wood. This could eventually cause wood rots and possibly attract
termites.
Bevels can be used through out the stairway, hand railing and even
framing. It's not uncommon to find small bevels on wood or concrete
stair treads.
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