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PREFINISHED PLASTIC LAMINATE CASEWORK Section 12304 15-1207 noted. At concealed locations, provide tops on all wall -hung and tall cabinets utilizing melamine on both faces. At locations where the tops of wall hung or tall cabinets are visible, provide tops on all wall -hung and tall cabinets utilizing Exposed Vertical Surface HPL exterior face and melamine on interior face. Fabricate bottoms, tops and frames of lock joint glued and screwed, or dowelled and glued construction to end panel construction. Simple butted not permitted. Tops and sides of tall units and wall -hung cabinets shall be 3/4 -inch thick particleboard core. Bottoms of upper cabinets shall be constructed of same materials as required for shelving in these specifications. Tall cabinets and base cabinets, fronts and sides shall be 3/4 -inch thick particleboard core. Cabinet backs shall be finished in semi - exposed material and be a minimum of %-inch thick. Dowel and screw partitions and boxed shelves into top framing, bottoms or ends, as applicable. Middle shelf of tall cabinets, 5'-0" or greater in height, shall be fixed. At top of counter height units, provide 3/4 -inch plywood boxed subframe, mortised and tenoned, glued and screwed, for concealed attachment of countertop and for cabinet rigidity. Provide toe space on floor -mounted units. For tall units and wall -mounted cabinets, include 5/8 inch x 3 inch concealed wood strips full length at top and bottom, for screw or bolt anchorage to wall to conform to pull requirements of Title 24. B. Cabinet Bases: If casework manufacturer chooses to use cabinet bases, they shall be 4 - inches standard height. Fabricate completely out of %-inch plywood (particle board cabinet bases and components will not be accepted) in continuous lengths to insure straight and level installation of Cabinet Bodies. Freestanding cabinets shall have cabinet ends running directly to the floor. Anchorage fasteners to be neatly installed through the back and anchor strip at the top and bottom, and middle at tall cabinets. C. Drawers: Fabricate and assemble drawer boxes with subfront and back glued and screwed into tenons at drawer sides. Extend bottom into dados with glue and screws at all 4 edges, using 1/4 inch materials matching the sides and backs. Install 2 -drawer guides for each drawer with positive closing and stop device to prevent inadvertent removal. Drawer boxes to be full height of drawer opening. Attach drawer front to subfront with #8x1" P.H.W.S. Closing Stops to be provided at the rear of both drawer sides, unless such is built into the slides to prevent the drawer front from impacting the cabinet body. D. Doors: Hang face -mounted over cabinet, pairs parallel with proper clearance at pull edges. Install hardware. Clearance Tolerances: Develop 1/8 inch maximum reveals. E. Countertops: 1. Securely glue Exposed Horizontal Surfaces HPL to Particleboard Core at 15 psi minimum pressure. Apply in accordance with glue manufacturer's directions. Apply backing sheet to underside of tops using same adhesive and method as for face sheet. 2. Furnish countertops in the longest possible lengths. Butt joints within the length of the countertop shall be neat and watertight. Tops, which require field joints shall be glued and joined using joint fasteners (4 -minimum) let into underside of top. Cut holes for sinks where occur and seal unfinished edges of hole to make waterproof. Make joints neat, flush and watertight. 3. Round all projecting or outside corners of all tops (including wall caps) with a 4 -inch minimum radius, or clip 45 degree angle corner. 4. Support clear spans of countertops using specified countertop brace at 3'-0" O.C. maximum spacing. Fasten to wall using largest diameter fastener that is compatible