- Q.To support a beam for a
residential deck, does a Sonotube pier need any
A.Jay Meunier, contracting
specialist at S.T. Griswold and Co., a ready-mixed
concrete supplier in Williston, Vt., responds:
First, check with your local building authorities
to find out what local codes apply.
I have never seen architectural or structural
drawings that did not indicate some amount of
reinforcing for concrete piers. We usually
recommend that a minimum of two pieces of #4 rebar
be placed vertically in an 8-inch-diameter concrete
pier supporting a structure. A larger-diameter pier
should have four or more pieces of vertical rebar.
The rebar provides the tensile strength needed to
resist lateral stresses that can be applied to a
concrete pier by ground movement, freeze cycles,
and wind loads.