Abstract: A curtain wall construction designed for glazing from the inside of the building, with the rubber gasket on the outside of the building, using a T-shaped gasket which fits into an outside facing groove formed in horizontal and vertical members assembled to make a frame for a wall panel, the relative dimensions of the frame and the gasket being such that the gasket may be first installed in the grooves, the wall panel may then be set in place resting against the gasket, and a panel clamping device attached from the inside to clamp the panel against the gasket and also cover the horizontal and vertical members to present a smooth inside appearance.