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Kiefer Built ContractingKIEFER BUILT CONTRACTINGCustom Homes · Northern Colorado
Kiefer Built home under construction using structural insulated panels

SIPs 101: The Shell Changes Everything

Structural insulated panels combine structure and insulation in one engineered assembly, reducing the gaps and thermal bridges that limit conventional framing.

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~15×1

Tighter in Oak Ridge blower-door testing

≈ R-142

Reported SIP whole-wall performance

140+ mph3

Simulated wind-load testing

A wall performs as a whole wall, not a row of insulation cavities.

A structural insulated panel bonds a rigid foam core between structural skins. Using that assembly for the shell can replace many separate framing and insulation steps with a continuous plane whose airtightness and whole-wall performance can be tested directly.

Compare the assembly, not the insulation label. by Kiefer Built Contracting

Compare the assembly, not the insulation label.

Oak Ridge blower-door testing found approximately 90% less leakage in a SIP test room than in an equivalent stick-framed room with fiberglass insulation. Industry technical data, informed by whole-wall research, reports roughly R-14 for a SIP wall versus R-9.5 for standard 2×4 framing after the framing itself is accounted for.12

Continuous insulation

Fewer leakage paths

Whole-wall performance

Swipe to compare

Comparison of standard construction and Kiefer Built SIP construction
MeasureStandard Stick-FrameKiefer Built SIP
Air leakage, blower-door testedBaseline~15× tighter1
Whole-wall insulation value≈ R-9.5≈ R-142
Tested wind resistanceCode-required assembly140+ mph simulated loads3
Use the system where it fits the project. by Kiefer Built Contracting

Use the system where it fits the project.

SIPs are not a finish upgrade; they are an early structural and envelope decision. The useful question is whether their airtightness, continuous insulation, erection sequence, and tested wind performance match the site, design, budget, and long-term goals of a particular home.31

Project-specific engineering

Envelope-first planning

Documented tradeoffs

Research behind the page

Sources & Citations

  1. Christian, Jeff, and T.W. Petrie, Heating and Blower Door Tests of the Rooms for the SIPA/Reiker Project, Oak Ridge National Laboratory, 2002. Blower-door testing found a structural-insulated-panel test room to have approximately 90% less air leakage — roughly fifteen times tighter — than an equivalent stick-framed room with fiberglass insulation.
  2. Industry testing dataStructural Insulated Panel Association (SIPA) and SIP manufacturer technical data, including Oak Ridge National Laboratory whole-wall R-value research. Industry testing and field data cited at 40–60% greater energy efficiency versus comparable stick-frame construction, and whole-wall performance of roughly R-14 for SIP walls versus roughly R-9.5 for standard 2×4 framing.
  3. Industry testing dataSIPA-conducted missile-impact and high-wind testing, evaluated alongside APA – The Engineered Wood Association. SIP wall assemblies withstood simulated wind loads of 140+ mph and debris impact without structural failure.

Citations 1, 2, and 6–13 draw on independent government, national laboratory, and public agency data. Citations 3–5 reflect structural insulated panel industry testing and manufacturer field data, cited here by source rather than represented as independent research.

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