Which of the following is NOT a place where joiners can be used?

The option indicating the mid-span areas as a place where joiners can be used is not correct. Joiners are typically employed in specific structural contexts where they can effectively distribute loads and provide stability to the overall framework.

In mid-span areas, the structural integrity and load-bearing capacity are generally critical, and using joiners in these locations could compromise the safety and strength of the framework. Typically, joiners are utilized in locations where they can provide support, such as in end bays or adjacent ledger areas, where they can help connect and stabilize different elements of the structure effectively. Therefore, the choice of mid-span areas does not align with the conventional applications of joiners in construction, making it the correct answer in this context.