Platforms for gas turbine engines are described. The platforms include a flow structure having a gaspath surface and a non-gaspath surface with a front end, a rear end, a first edge, and a second edge. A platform connector extends from the flow structure. A first layer forms a part of the gaspath surface and is a non-continuous layer terminating at the ends and the edges. A second layer forms a part of the platform connector and is a non-continuous layer terminating at the ends and the edges. The second layer contacts the first layer proximate the first and second edges. A third layer defines an internal void and is a continuous layer arranged between the first layer and the second layer and defines a part of the flow structure and a part of the platform connector.