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Flatness Tolerance |
The
finished terrazzo floor shall not vary more
than plus or minus 1/4 inch in a ten foot span.
Often times, a perfectly acceptable terrazzo
floor in a large area with one or more window
walls will appear to have variations greater
than the above tolerance. The optical illusion
is further magnified if the floor has a high
polish.
It is important to realize that Monolithic
and Thin-set Terrazzo toppings are a veneer
and will automatically follow the contour of
the concrete subfloor. Therefore, it is mandatory
that the concrete subfloor have the same tolerance
of plus or minus 1/4 inch in a ten foot span.
When corrections to nonconforming concrete
subfloors are necessary, they are the responsibility
of the concrete contractor but the materials
used shall be approved by the Terrazzo contractor.
MONOLITHIC AND THIN-SET
TERRAZZO: Divider strip spacing is
dictated by the concrete joint locations.
It is essential that the structural engineer
design concrete control joints to prevent
random cracking. General guidelines for concrete
joints in accordance with ACI 302.1 R.89.
Rectangle shaped concrete panels should not
be longer than 1-1/2 times the width. Two
angle type divider strips placed back to
back over such joints is a requirement, with
the same width through the Terrazzo topping
that appears in the substrate. It may be
necessary to place a temporary wood strip
between the divider strips, remove the wood
once the Terrazzo floor has been finished
and caulk the void with a flexible sealant.
All divider strips used in a monolithic or
thin set Terrazzo floor system have no function
other than aesthetics, unless placed over a
break in the substrate. It is normal to use
divider strips for design or color changes. |
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