2109.3 Adobe Construction
The modulus of rupture shall be determined by the equation:
where, for the purposes of this section only:
Sw = Width of the test specimen measured parallel to the loading cylinder, inches (mm).
fr = Modulus of rupture, psi (MPa).
Ls = Distance between supports, inches (mm).
St = Thickness of the test specimen measured parallel to the direction of load, inches (mm).
P = The applied load at failure, pounds (N).