| CPC E04F 13/0866 (2013.01) | 10 Claims |

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1. A building system comprising:
a plurality of support members located in a plenary space of an interior building space, each support member comprising a support surface;
a plurality of first building panels located below the plenary space and secured directly to the support surface of the plurality of support members, each of the plurality of first building panels comprising a non-porous body, each of the first building panels comprising a first major surface opposite a second major surface and a side surface extending between the first major surface and the second major surface; and
a plurality of second building panels secured directly to the plurality of first building panels by an adhesive and a plurality of first mechanical fasteners, each of the plurality of the second building panels comprising a porous body, each of the second building panels comprising a first major surface opposite a second major surface and a side surface extending between the first major surface and the second major surface;
wherein the second major surface of the plurality of first building panels faces the support surface of the plurality of support members; and
wherein the second major surface of the plurality of the second building panels faces the first major surface of the plurality of first building panels.
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