reinforced with one layer of reinforcement, with the uncut edges lapped the
width of one mesh and the cut ends and edges lapped not less than 50 mm 2
inches. Laps shall be tied together with 1.3 mm 18 gauge wire every 250 mm
10 inches along the finished edges and every 150 mm 6 inches along the cut
ends and edges. The reinforcement shall be supported and secured in the
centers of concrete fills. The mesh shall be continuous; except where
expansion joints occur, mesh shall be cut and discontinued across such
joints. Reinforced concrete fill shall be provided under the setting-bed
where the distance between the under-floor surface and the finished tile
floor surface is 50 mm 2 inches or greater, and shall be of such thickness
that the mortar setting-bed over the concrete fill shall be not less nor
more than the thickness required in the specified TCA Hdbk methods.
3.5
INSTALLATION OF CONDUCTIVE FLOORING
Conductive ceramic mosaic tile floors shall be installed in accordance with
ANSI A108.1.
3.6
INSTALLATION OF MARBLE THRESHOLDS
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NOTE: Where the top of tile floors will occur at a
different elevation from the top of finished floors
in adjoining spaces, provision for marble thresholds
or saddles will be edited appropriately.
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Thresholds shall be installed where indicated in a manner similar to that
of the ceramic tile floor. Thresholds shall be the full width of the
opening. Head joints at ends shall not exceed 6 mm 1/4 inch in width and
shall be grouted full as specified for ceramic tile.
3.7
TESTING
Electrical resistance tests shall be performed on conductive flooring in
the presence of the Contracting Officer by a technician experienced in such
work and a copy of the test results shall be furnished. Test procedures,
testing apparatus, and test results shall be in accordance with the
provisions for Conductive Flooring in NFPA 99.
3.8
EXPANSION JOINTS
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Note: Expansion-joint details will be indicated on
the drawings. Details as provided in TM 5-805-6
will be used as applicable. Location of expansion
joints should, insofar as practical, be located
outside the areas of tile finishes.
**************************************************************************
Joints shall be formed as indicated and sealed as specified in Section 07920
JOINT SEALANTS.
3.8.1
Walls
Expansion joints shall be provided at control joints in backing material.
Wherever backing material changes, an expansion joint shall be installed to
separate the different materials.
SECTION 09310
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