I'm evaluating repairs being done to some residential roof trusses. At the dormer locations, the top chord (2x12) of the truss is notched to allow it to sit on the 2ply - 2x8 header. I'm estimating the depth of the notch to be 5.3in which would exceed the maximum 0.25d allowed in CSA 086. My forces are relatively small, and if I check the fracture shear resistance due to the notch and the shear resistance due to the reduced cross-section, they are both fine.
Anyone know why there is a limit of 0.25d was established? Since the calculations show that it's fine, would it still need to be reinforced?
Anyone know why there is a limit of 0.25d was established? Since the calculations show that it's fine, would it still need to be reinforced?