Why are SIPs so much stronger?

SIPs structural characteristics are similar to a steel I-beam. The skins act like the flanges of an I-beam, and the rigid core provides the web of the I-beam configuration. This composite assembly yields stiffness, strength, and predictable performance. Not only do test results show SIP panels to be between two to seven times stronger than traditional framing, but also natural disasters have proven it time and again. Homes built with SIPs withstood the Great Hanshin (Kobe, Japan) and North Ridge earthquakes, as well as Hurricane Andrew.