The measured properties of building materials and their composites sometimes reflect the conditions to which they have been exposed while being prepared for test. Conditioning these materials to saw standard reference state my be used to minimize such effects.

A methodology for establishing conditioning requirements for building materials and composites is presented and its use illustrated by applying it to two building composites.

The composites to which the methodology is applied are: I) gypsum wallboard and 2) a structural sandwich wall panel.

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