Does it matter if the joist spacing is 16" or 24" o.c. for the blocking?

No. For lateral stability of floor joists and rafters, blocking requirements are based on the d/b ratio. See WFCM 3.3.1.4 and 3.5.1.3.

The following FAQ is based on the presentation of STD311 - Part 2 of the 2012 WFCM Webinar Series: Wind Load Distribution on Buildings - Load Paths.

What is the difference between a collar tie and a rafter tie?
What is a dropped header?
Can the WFCM be used to design for wind Exposure D?
Are staples acceptable as alternate fastening per ESR 1539 Table 27 for roof sheathing?
What load combinations are taken into account in the 2015 WFCM?
Why is rafter slope limited to 12:12?
Are there any examples illustrating roof connections to raised heel trusses?
How do you resolve the diaphragm shear loads for sloped roofs?
Does it matter if the joist spacing is 16" or 24" o.c. for the blocking?
If you use a rafter strap over the top of the rafter at the peak can you eliminate the collar ties in the upper one third?
What is the maximum roof pitch angle, beyond which the sloped roof can no longer be considered an effective resistive diaphragm element for transfer of lateral loads?
If multiple connectors are used, are their capacities additive?
What is the limit on height of studs in design of perforated or segmented shear wall design?
If the corner walls from both directions are used as shear walls, can we use one hold-down for one direction only?
Can you eliminate the collar tie with the use of a mechanical connection over or at the ridge beam?
I noticed that MWFRS coefficients are used. That's ok for walls, but I typically use C&C coefficients for truss anchorages. How does WFCM address this?
Does the rafter to top plate uplift connector put the top plate into cross grain bending?
Is roof diaphragm blocking required at the top plate to transfer shear from the diaphragm boundary?
For diaphragm blocking, does the number of joist bays blocked depend on the spacing of the joists or rafters (e.g., 16" or 24" o.c.)?
Are there specific design requirements in the WFCM for the nail head, diameter, and length for different types of sheathing?
If a rafter strap is used at the peak can collar ties be eliminated?
Should an interior shear wall on the top floor extend through the attic to the underside of the roof?
Are there excel spreadsheets or other calculators available based on the WFCM?
Are portal frames covered in the WFCM?
What is Mean Roof Height (MRH) and does WFCM impose a limit on it?
Can wind exposures vary around a structure?
What's the definition of Exposure B, C, and D?
What is the difference between the envelope procedure and directional procedure and which approach is used in the WFCM?
How does the WFCM address floor plan offsets that result from wall extensions and recesses?
Where can I find information on conventional wood frame construction?
What force should the vertical members next to wall openings (chords) be designed for in perforated shear walls? Is it the same as the end chords?
What resources are available for wood construction in high seismic areas and why build with wood in earthquake-prone areas?
What is the difference between the perforated shear wall method and the segmented shear wall method?
What is the maximum shear wall aspect ratio for various wood wall assemblies?
How do I calculate a capacity for lumber sheathing or heavy timber decking diaphragms?
Are there deflection limits for cantilevers?
What are the design manuals for wood construction in high wind areas?
What is splicing and how does it affect the structure?