You mean those building code manuals I have on my shelf in SI units
don't exist? The oldest is from 1976 - it even has a code change based
on research I did in university in 1975.
The fact that lumber is still made to the old dimensions only shows that
converting to metric doesn't require conversion of all materials to new
Most of my tape measures have both.
Carpenters will tend to use english measures for construction, but there
will be times where they will need metric.
Basic construction materials are still (mostly) english measures. Plywood
thicknesses are sometimes given as metric, depending on supplier/purpose.
Cabinet grade plywoods etc (especially that sourced from overseas) are often
"Official" publications & standards (eg: building code, electrical etc) are
officially metric, will give metric as the base/official specification, but
will often include english measure equivalents. If there's a conflict, metric
Eg: roof sheathing/span table specifications are given officially in metric with
english equivalents using "english" spec'd materials.
Other "fields" are more firmly entrenched in metric. Eg: surveying, transport
and measures, containers, etc.
Generally speaking, a DIY or tradesperson's work is almost entirely english
But once you get into manufacturing, especially those export related (except
construction lumber or liquid fuels to the US ;-), metric takes over almost
Chris Lewis, Una confibula non set est
It\'s not just anyone who gets a Starship Cruiser class named after them.
Am Samstag, 11. März 2006 22:25:32 UTC-5 schrieb snipped-for-privacy@UNLISTED.com:
Mark this are questions only an american can ask. Guess how any development
country goes along very well in metric.
You have to give up a 2x4 what is not a 2x4 either. or rediculus nails and
screw sizes where have only one purpuse "teach the biggest BS ever".
The whole world do not have this problems you are pointing here.
There is one way only. Change regardless to metric and dump everything you
know or have done so far in Imperial. But imedieattly.
Why, because Imperial is a one way DEAD END Road !!!!!
As sooner you turn as better . The way back on track is horribel but just g
ets worse every day PERIOD. Forgett about this flickering lightat the end o
f this dead end Imerial Road, go out of that tunnel and back into the sun.
Other countries are ahead in construction methods by 30 to 80 years !!! gue
s why ? Because a 2nd grader can do there better math then any engineer in
imperial US Add 5/32 + 19/64 + 3/8 in 4 seonds ohh for example add 0,
5 + 1.6 + 0,9 (numbers are not conversions) make the test your self with
is faster? I bet you lost GRADE F sorry
On 1/1/2014 3:54 PM, firstname.lastname@example.org wrote:
Not really if you look at US manufacturers' spec's, they're in English
units with metric equivalents...
Example from Georgia-Pacific current datasheet --
Available Types & Sizes (Sized for 4' x 8')
Length (Minimum) 7'-11 7⁄8" (2.435 m)
Width (Minimum) 3'-11 7⁄8" (1.216 m)
Building Code Performance Categories, Panel Thickness
• 1/4 CAT, 0.234" (5.94 mm)
• 11/32 CAT, 0.328" (8.33 mm)
• 15/32 CAT, 0.453" (11.50 mm)
• 19/32 CAT, 0.578" (14.68 mm)
• 23/32 CAT, 0.703" (17.85 mm)
Length/Width Tolerance +0, –1⁄16" (+0, –1.6 mm), based on 4' or 8' value
Straightness Tolerance ±1⁄16" (±1.6 mm)
Squareness Tolerance ±1⁄8" (±3.2 mm)
NB that the thicknesses are actually 1/64" under the nominal, rounded to
three decimal places. That is, nominal 3/4" is now in a 23/32" category
but the actual dimension is shaved yet another 1/64".
23/32 --> 0.71875
32*0.703 --> 22.496 --> 22.5/32 --> 0.703125 --> *25.4 = 17.859375
OTOH, 19/32*25.4 --> 18.25625, way too far over to be just rounding.
AFAIK this is pretty much what all US construction ply is.
Now when get to foreign hardwood ply and the like there's no telling
which it follows depending on point of origin.
On 01/01/2014 03:54 PM, email@example.com wrote:
When I was in 7th grade around 1962 the teacher told us we better learn
the Metric system because the whole US would be using it by 1970 and
we'd be left in the dust if we did not know it.
The US will be using Whitworth before it goes Metric.
I actually have a few Whitworth "spanners" ...have no idea where they
Well, you're a couple of years older than I, but it was the same thing
in our school in '62. I did learn the metric system (use it daily)
but also see no reason to change everything else. Particularly in the
age of calculators, it's incredibly easy to convert between the two in
the few cases where it's necessary.
You funnin' us, right? ;-) The US is already metric. The inch is
On 01/01/2014 06:08 PM, firstname.lastname@example.org wrote:
I live in the US but just happened to recall that wrenches are
"spanners" over there. I owned a TR-3 for many years and though I used
"regular" English tools with it...there may have been a few Whitworth
bolts on it.
However...metric really is easier as you do not need to calculate what
size is smaller 9mm or 10mm for example
Canada went through this all many years ago. While Canada is officially
metric, we all work with both systems. Adding to the complexity, we had a
different gallon and pint than the US. We used the Imperial measurement,
while the US had its own. Temperature is given on the Canadian news in
Celsius, but we easily convert to Fahrenheit in our heads when we watch US
news. I buy a length of 4 inch PVC plastic pipe with the size of 100mm
printed on its side. Regular threaded pipe is known as nominal 3/4 inch
size. I buy a pound of meat in the stores and get just under one half
kilogram. You learn to work both ways and use the system that fits best the
job at hand. As a former graphic designer/typesetter and have rulers that
are in points, picas and fractions of an inch that most people don't use
such as 1/10", 1/6", and others -- again I use whatever works best and
Don't sweat it, it all works out in the end.
We (Aus) changed back in the 70s with much the same results as Canada
except we dont have a recalcitrant neighbor so the general public take
up has been more complete. Weather Temperature is almost universaly
accepted in Celcius.
Anything a bit mechanical is a different story.
We have Whitworth bolts in inch diameters and mm lengths sometimes.
In fact maintenance of anything has to stick to its original sizes
whatever that may be..
Timber has all changed but I have little or no experience.
Ordinary Pipe was British standard pipe before and now 1inch pipe is 25
mm without any change because the inch was inside and the outside was
very approxomate anyway The tread is tapered.
Tyres are on 15 inch rims and 195 mm wide for example:-Z
Of course anything scientific has been metric CGS and latter MKS
systems for ever.
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