Originally Posted by
Travis Grubbs
Does every house have to have shear walls?
*Should have*, yes (not 'shall'). In many areas of the country, though, they barely have any diagonal bracing.
Are they only required when indicated in the plans?
Tough question when answered as asked
, you will find them shown on the plans, and those are required, now for the other part of your question, are all shear walls which are required shown on the plans - hopefully.
When are multiple foundation anchor / hold down systems required?
When using mud sills, is another system also required?
Those answers all depend on the engineering - go with what is shown where on the plans.