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RE: Plywood Roof Diaphragm Connections

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Title: RE: Plywood Roof Diaphragm Connections

When I use a holddown anchor such as a hurricane series anchor by Simpson Strong Tie, I use the nails in each truss to transfer the shear load down through the truss and into the anchor.  I pick an anchor that can handle the forces.  If I can't get the nails to work alone, I have been placing blocking between the trusses to help transfer the load.  My next question is how big the heel depth can be before I have to provide blocking, if the nails and anchor both work?  In other words, how big can the heel depth be before I have to start considering weak axis bending of the truss and the flipping of the trusses onto their sides?

Zachary Goswick