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SIP Spec

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Scott:

In terms of specification, the SIPA report departs from the ICC-ES model
of qualification in that the panels are "performance rated," similar to
structural sheathing or performance rated wood I-joists.  The values in
Table 1 of the report are all that needs to be known to specified or
classify the structural performance of the panel.  In other words, an
engineer could design using the values in Table 1 (or other values), and
simply specify these values in the design documents.  However, at this
point in time, few people would understand the meaning of the
performance values.

Currently only one "grade" of panel exists. But in the future, it is
very likely that multiple grades will exist.  At this point the limits
of use in the design guide are obvious--no other SIP manufacturer
specifies SIPs in this manner.  But this will change, I am currently
working with other SIP mfg's on establishing similar engineering data.
Whether this information will end up in ICC-ES reports is yet to be
seen.  ICC-ES AC04 does permit an "engineering" option in lieu of just
providing test data.

With respect to quality assurance, the engineering approach permits
pooling of all the test data--this wasn't possible before.  Using the
pooled data, true statistical confidence intervals can be established,
which permits the use of statistical process control in the production
facility.

--Eric
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