An up-tight surface covering system for attaching a facing of a panel member to a support structure comprises an adjustable hanger bracket for attaching a grid member to the support structure and a clip for attaching the panel member to the grid member. The adjustable hanger bracket comprises an arm rotatably attached to a support. The arm includes a first section extending substantially parallel to the support and a second section extending substantially perpendicular to the support. The second section has at least one slot for receiving a mechanical fixing member. The clip comprises a main body portion having an attachment member extending from a substantial center thereof. The main body portion has engagement members extending from opposing sides of the main body portion and substantially perpendicular thereto. The engaging members have abutment members extending from side surfaces thereof substantially perpendicular to the main body portion and the engaging members.