Aluminum is an ideal material for sub framing system. Water regularly drains and evaporate through the cavity. Cladding attachment systems therefore require solutions with a high corrosion resistance. This is especially significant in an open-joint configuration where the openings are larger in order to achieve pressure equalization. Aluminum is corrosion free and particularly durable. Fire safe material are also essential as the cavity create and air gap potentially allowing fire to spread. It is critical to use firesafe materials such as aluminum not only to conform with building codes but also to stay on the safe side. Aluminum is also light easy to work with but sturdy enough and does not deteriorate over time.