Sash balances shall be a spiral type, and easily adjustable to counter balance weight of sash. The vent jambs of the movable sash and meeting rail shall be weather-stripped with fin seal pile. Unless otherwise specified, all windows shall be factory glazed with conventional SSB, or DSB clear glass. The glass in the prime unit shall be bedded with a type of material that shall have a firm elasticity and shall not become brittle during glazed units service life. The glazing bead shall be of extruded rigid vinyl.
Thermal panels are marine glazed with soft vinyl.
Fastening together, or mulling, of multiple windows shall be with manufacturer's standard T lock mull and face cover. Windows shall be installed in a locked position, plumb and level, with non-corrosive aluminum or galvanized nails. Sill shall be adequately supported along its entire length. A non-hardening mastic compatible with aluminum shall be provided by the window installer and applied in sufficient quantity to provide a watertight seal between window and surrounding construction. Slope, or degree of sill will not be less than 15 degrees to assure proper water shed.