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Materials & Specificationsaka: SIPaka: structural panel

Structural Insulated Panel

In Plain English

A panel that combines structure and insulation in one unit, used for walls and roofs to build very energy-efficient buildings.

Definition

A structural insulated panel (SIP) is a high-performance building panel consisting of a rigid foam insulation core sandwiched between two structural facing boards, typically OSB. SIPs serve as walls, roofs, and floors simultaneously providing structure, insulation, and an air barrier. Buildings using SIPs are extremely energy efficient and can be erected quickly.

Why It Matters in Bidding

SIPs shift cost from the field to the factory, so a bid built around them trades higher panel and shipping costs for reduced framing labor and a faster, more predictable erection schedule. Estimators must account for engineered shop drawings, crane and crew requirements, and longer lead times, because the savings only materialize if site logistics and trade coordination are planned correctly.

Example

A GC bidding an energy-efficient lodge prices a SIP shell and shows the owner that the premium panel cost is partly offset by cutting two weeks of framing labor and eliminating separate insulation and air-barrier scopes.

Related Terms

Oriented Strand BoardFoam InsulationRigid InsulationComposite Material

Frequently Asked Questions

SIP bids front-load cost into engineered panels and shipping while sharply reducing field framing and insulation labor. Estimators must include shop drawings, crane time, a trained crew, and longer procurement lead times. The combined structure, insulation, and air barrier in one product also collapses what would be several separate trade line items.
They can, but rarely on material cost alone. Savings come from faster erection, lower framing labor, fewer trade handoffs, and tighter energy performance that may reduce HVAC sizing. The net depends on building geometry, openings, and site access. Complex designs with many cuts erode the labor advantage and raise waste.
Because a SIP serves as structure, insulation, and air barrier at once, a panel package typically covers what would otherwise be framing, sheathing, cavity insulation, and air sealing. Estimators should still scope penetrations, electrical chases, connecting lumber, sealing tapes, and interior and exterior finishes, which are not part of the panel itself.

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