A Structural Insulated Panel (SIP) consists of rigid insulation sandwiched between an outer skin, typically oriented strand board (OSB). The finished panels can be used for floors, roofs, and external walls. Insulation, sheathing, and structure are all provided in one panel.

Features of SIPs

SIPs buildings are superior to conventional frame, or "stick-built", construction in the following ways:

• Up to 50% Savings in Heating/Cooling Costs. The studs of a conventional wall create a "thermal bridge" between the exterior and interior wall, conducting heat from side to the other. This lowers the insulating value (or R-value) of the whole wall. SIPs to not have this thermal bridge. Furthermore, SIPs create a much more airtight frame. This means SIP homes require smaller heating/cooling systems.
• Less construction time and on-site waste. SIP panels are pre-manufactured in a fabrication facility, and can be cut to size (including door and window openings ) before being shipped. Compared to stick-built construction, SIPs achieve a 65% reduction in site labor and a significant reduction in on-site waste. This means reduced construction costs and a lockable shell sooner.
• Green product. In addition to the lower energy costs, OSB is made from fast-growing tree species and there is higher utilization of the wood than with board lumber.
• SIP construction is stronger. SIPs have significantly improved strength; typically twice that of conventional walls.
• Improved air quality. SIPs form an airtight shell that allows better control through the ventilation system. These homes are ideal for those with respiratory issues or chemical sensitivities.
• Addresses shortage of quality lumber. SIP homes require much less dimensional lumber as the panels provide most of the structure.

For More Information on SIPs

The Structural Insulated Panel Association (SIPA) has a great FAQ on SIPs

Also, a couple books we can recommend (click on the images to go to SIPA website to purchase):

                               

In the 2007 supplement to the 2006 International Residential Code, a prescriptive method was added for using SIPs as walls. This was the result of a combined effort of SIPA and the Partnership for Advancing Housing Technology (PATH). Click the image below for this section of the IRC: