What method should be used to support a two-plank cantilever using putlog clips and putlog couplers?

The most effective method to support a two-plank cantilever using putlog clips and putlog couplers is to ensure that the transoms underneath the cantilever extend to support another ledger. This approach is crucial because transoms act as horizontal supports that distribute the load from the cantilevered planks. By extending these transoms, you provide an additional layer of support which helps to effectively manage and stabilize the weight on the cantilever, reducing the risk of overloading and potential collapse.

Supporting another ledger with the extended transoms creates a more integrated framework that enhances the overall stability and safety of the scaffolding structure. This addition ensures that the cantilever does not function in isolation, but rather as part of a well-supported system, allowing for safe work practices and adherence to engineering principles in scaffolding.

Using additional braces, switching to heavier putlogs, or increasing spacing between transoms may not address the specific issue of cantilever support as effectively as extending the transoms will. While these methods may have their merits in different scenarios, the extension of transoms directly adds necessary support for the cantilevered section, making it the most appropriate choice in this context.