The FEMA Homebuilder's Guide to Coastal Construction Fact Sheet #24 is a nice three page printout you can give to builders, preferably before they install the ledger board and siding.

It's not as if there is a great materials cost or that it takes that much longer to do it right. I installed a deck ledger once following these guidelines and it cost approximately $60 more in materials and took about an extra 15 minutes over doing it the substandard way.

Corn Walker