in the mix, nor sealers or curing compounds applied
without specific approval of mortar and grout
manufacturer. Slabs should have steel trowel and
fine broom finish and be free of laitance. In case
of any question on condition of slab, it should be
tested for bondability with a Dillon Dynamometer and
show a tensile bond of not less than 300 psi. These
requirements should be incorporated in Section 03300
CAST-IN-PLACE STRUCTURAL CONCRETE
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Before tile is applied, test structural floor for levelness or uniformity
of slope by water. Fill, level, and retest areas as required to meet
tolerances specified in Section A-3 of ANSI A108.1 and retest. When
specified levelness or uniformity of slope is obtained, prepare floors for
setting bed in accordance with ANSI A108.1. Free floors of sealers,
coatings, oil, dirt, and dust. Prepare floors before application of resin
mortar in accordance with printed instructions and recommendations of the
mortar manufacturer.
3.2
INSTALLATION
Except where specified otherwise herein, apply materials in accordance with
manufacturer's printed instructions, including recommended safety
requirements.
3.2.1
Setting Bed
Using a plain (not serrated) trowel, apply a continuous setting bed of
chemical-resistant mortar, not less than 3 mm 1/8 inch thick. Apply only
over a floor area that can be tiled during "open time" of mortar. Place
tile into setting bed and tap lightly to a true plane. Level tile as it is
placed. Maintain uniform tile joints of 6 mm 1/4 inch minimum and 10 mm 3/8
inch maximum width. Allow the setting bed to cure sufficiently to anchor
tile in place, but not less than 24 hours, at a floor temperature of not
less than 16 degrees C 60 degrees F. When furan setting bed is used, first
install a glass reinforced asphalt membrane. With flatback or serrated
back tile use trowel with 6 mm 1/4 inch square notches on 13 mm 1/2 inch
centers.
3.2.2
Tile Joints
After the setting bed has cured, fill tile joints with chemical-resistant
grout. Spread grout on surface of tile and work it into the open joints
with a trowel. Fill joints flush with top surfaces of tile. Remove excess
grout with one pass of a trowel or squeegee pulled diagonally across joints
in order to prevent imperfect filling and low joints. Immediately fill
voids, pinholes, and depressions with additional grout. Protect completed
joints from dampness. Permit grout to harden for not less than 72 hours.
Flush cure joints with tile edges; contour depression shall not exceed 1.2
mm for 6 mm 3/64 inch for 1/4 inch wide joints or 2 mm for 10 mm 1/16 inch
for 3/8 inch wide joints. Sealants for expansion joints provided by the
grout manufacturer shall be compatible with grout and setting mortars.
Completely fill joints with no back up foam or rope. Install joints maximum
6000 mm 20 feet on center above slab around room peripheries and columns
but not at drains.
SECTION 09330
Page 8
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