with length 3 feet, height 4 feet, and hypotenuse 5 feet.
In a large room, a 6:8: 10-foot triangle can be used. To
establish this triangle, you can either use a chalk line or
draw the line along a straightedge.
With the centerlines established, make a trial layout
of tile along the center lines. Measure the distance
between the wall and last tile. If the distance is less than
2 inches or more than 8 inches, move the centerline half
the width of the tile (4 1/2 inches for a 9 by 9 tile) closer
to the wall. This adjustment eliminates the need to install
border tiles that are too narrow. (As you will learn
shortly, border tiles are installed as a separate
operation-after the main area has been tiled.) Check
the layout along the other center line in the same way.
Since the original center line is moved exactly half the
tile size, the border tile will remain uniform on opposite
sides of the room. After establishing the layout, you are
now ready to spread the adhesive.
SPREADING ADHESIVE.— Before you spread
the adhesive, reclean the floor surface. Using a notched
trowel, spread the adhesive over one-quarter of the total
area bringing the spread up to the chalk line but not
covering it. Be sure the depth of the adhesive is the depth
recommended by the manufacturer.
The spread of adhesive is very important. If it is too
thin, the tile will not adhere properly. If too heavy, the
adhesive will bleed between the joints.
Figure 6-10.—Layout of a border tile.
Allow the adhesive to take an initial set before a
single tile is laid. The time required will vary from a
minimum of 15 minutes to a much longer time,
depending on the type of adhesive used. Test the surface
with your thumb. It should feel slightly tacky but should
not stick to your thumb.
LAYING THE TILE.— Start laying the tile at the
center of the room. Make sure the edges of the tile align
with the chalk line. If the chalk line is partially covered
with the adhesive, snap a new one or tack down a thin,
straight strip of wood to act as a guide in placing the tile.
Table 6-1.—Estimating Adhesive for Floor Tile
6-6
