M2
92 mm metal stud sizes, which are often
Ex, custom cabinets are to be built
fixed.
to a width that converts to 508 mm.
500 would be the probable choice,
Examples: bathroom stall widths,
and would be permitted if this were
bathroom component mounting heights,
not a code or exact required
concrete wall thickness, window
dimension.
dimensions, base plate sizes, parking
stall widths, cabinet widths, counter
Codes and Standards
heights, slab thickness, door louver
and window sizes, ductwork sizes, shelf
About 90 % of codes and standards
spacing, railing heights and on center
needed by us to do design are
dimensions, landscape installation
available today in metric.
dimensions, etc.
Many not in metric are being
Critics have indicated this is not
converted now.
always possible, which we know. But
increments of 100 and 50 mm should now
Codes and standards have not
become the baseline for project design,
hindered renovation or new
with 10 and 5 mm increments used only
construction designs in metric to
as required.
date.
Simple Mathematical Rounding shall not
Documents listed below are now being
be used.
extensively used in metric design
projects of every sort.
Ex, A design dimension simply converted
to 3658 mm.
For codes or standards not in
metric, rounding techniques have
Professional Rounding shown below,
been proven sufficient.
takes simple mathematical rounding,
adds professional judgment.
The missing component to full metric
conversion in United States
Step 1. Convert The Dimension
construction is the implementation
Mathematically A pavement width in some
of metric design projects in the
codes becomes 914 mm.
federal, state, local and private
design communities.
Step 2. Select A Replacement Dimension
(Use Rachet)
Only this full implementation will
1000 would be the preferred
create the need to continually
replacement.
improve metric codes and standards.
950 would be used only with
These are sample documents where
900 would offend the code and could
most of the text, or the entire
not be used.
text, contain SI/english or pure SI
data.
For non code dimensions, smaller
dimensions in increments of 100 might
AASHTO Standard Specs. for
be selected.
Structural Supports for Highway
Signs, Luminaires, and Traffic
14
Previous Page
