It isn't metric at all. Mike was just caught dishing out his usual bullshit
again and is trying to backpeddle.
"dpb" wrote in message
If it were a mis-measurement, sure, but in this case it isn't a mistake,
it's a deliberate compensation.
It's the _correct_
measurement for laying out so that the span will work
correctly for 8-ft sheets, a most common dimension for sheathing,
subflooring, etc., etc., etc.
If the truss/rafter/joist system is adequate on 19.67" centers, it's
certainly adequate on a _closer_
spacing since that shortens the
distance between them and thereby decreases the deflections, etc. from
what would be (a few percent at most so not enough to make any practical
difference, but it _is_
the conservative direction).
On 10/31/2011 12:22 PM, Han wrote:
> A difference of .47" is more than 1 cm, the width of a pinky nail, and
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