What Are SIPs?
SIPs are made by bonding a sheet material — OSB, plywood, steel, or fiber-cement — onto both sides of an expanded polystyrene (EPS) foam core. By themselves, these materials are not strong enough to supportloads, but once they’re made into panels they can be used for structural elements like walls, roofs, and floors.
The most common panels consist of OSB over EPS. Raw SIP panels are produced in factories and then cut to size in fabrication plants, or sometimes on site.
Mistakes and changes sometimes force the crew to alter panels in the field. Simply use an electric SIP groove hot knife tool to neatly remove the foam so there will be room for a block spline.