
What are SIPs made from? Structural insulated panels (or SIPs for short), are made from a layer of polymer foam sandwiched between two rigid panels. The foam layer can be made from either expanded polystyrene foam (EPS), extruded polystyrene foam (XPS) or polyurethane foam.
Full Answer
What are SIPs and how do they work?
What are SIPs? Structural insulated panels (SIPs) are a high-performance building system for residential and light commercial construction. The panels consist of an insulating foam core sandwiched between two structural facings, typically oriented strand board (OSB).
What is a single insulated panel (SIP)?
The innovative panels consist of an insulating foam core sandwiched between two structural facings, typically oriented strand board (OSB). SIPs are precisely manufactured under factory controlled conditions and fit nearly any building design. The result is a building system to be proud of.
What is a sip board made of?
The board can be sheet metal, plywood, cement, magnesium oxide board (MgO) or oriented strand board (OSB), and the core can either be expanded polystyrene foam (EPS), extruded polystyrene foam (XPS), polyisocyanurate foam, polyurethane foam, or be composite honeycomb (HSC). SIPs share the same structural properties as an I-beam or I-column.
What are the processing methods for SIP panels?
There are two main processing methods which correspond to the materials used for the SIP core. When manufacturing a panel with a polystyrene core both pressure and heat are required to ensure the bonding glue has penetrated and set completely.

How do you make SIP panels?
0:352:45EZ - Sips - Structural Insulated Panels - YouTubeYouTubeStart of suggested clipEnd of suggested clipAnd easy easy sips our 4-foot wide wall height blocks of 6 and 3/4 inch thick styrofoam Bank. ThemMoreAnd easy easy sips our 4-foot wide wall height blocks of 6 and 3/4 inch thick styrofoam Bank. Them together for super insulated green wall panels built right on the jobsite.
How are SIP panels joined together?
0:152:25How are SIP panels joined together? - YouTubeYouTubeStart of suggested clipEnd of suggested clipIt's a hook hopefully you can see that it's a hook that's operated with a keyway here. And as theseMoreIt's a hook hopefully you can see that it's a hook that's operated with a keyway here. And as these go together the cam lock is activated.
What are SIPs made out of?
Structural insulated panels (SIPs) are a high-performance building system for residential and light commercial construction. The panels consist of an insulating foam core sandwiched between two structural facings, typically oriented strand board (OSB).
Are SIPs cheaper to build with?
How much more will it cost to build with SIPs? If you are building a high performance building, SIPs will cost less than any equivalent system. If you are looking to build at the cheapest up front cost to minimum building standards, SIPs will cost between 3%-7% more than a stick framed home.
How long will a SIPs house last?
How Long do SIPs Builds Last? Structural insulated panels have an estimated lifespan of 60+ years, while some of the first instances of SIPs builds are now 90 years old, they've only been in more common usage for the last three decades.
Do SIPs have studs?
Although Thermocore SIPs do not use studs, they're designed with the same construction principles found in steel I-beams, making them two to three times stronger than today's stick built walls. The foam core and the two skins form an I-beam matrix that is extremely strong and lightweight.
What happens if SIP panels get wet?
When exposed to moisture, SIPs panels with OSB or plywood facings may form unhealthy mold that can diminish the air quality of a home or building.
Can you make your own SIP panels?
If you can build with sticks, you can build with RAY-CORE SIPs ®. Uses standard framing practices, no special plans, no expensive engineering, no specialized builders, no costly cranes. "Easy-peasy"!
Can SIPs panels get wet?
If the panels do get wet, it is important to ensure that they are allowed to dry. Panels should not be tightly wrapped in plastic, instead they should be loosely covered to promote the movement of air and drying.
Are SIPs cheaper than stick framing?
SIPs versus Stick Framing: Building with SIPs Costs Less in Long Term. Stick framing has been the go-to construction method for almost two centuries. Over this time, there have been many changes and improvements in building methodology as well as construction materials used for framing and insulation.
Are SIPs cheaper than brick?
As a result, a 10% difference in prices for this element of a build will influence the overall price by 1.5-2.5%. Because SIPs walls are built off-site and then quickly erected on site, this element of the project is significantly faster than relying on bricklayers to build walls using masonry blocks.
Are SIP homes worth it?
SIPs are definitely worth the investment. The improved indoor air quality decreased energy costs, and lower labor needs all add to the long-term value of choosing to build with SIPs. You can reduce construction on labor cost. In the long run, this would be a significant investment.
What is a SIP panel?
Structural insulated panels (SIPs) are a high-performance building system for residential and light commercial construction. The panels consist of an insulating foam core sandwiched between two structural facings, typically oriented strand board (OSB). SIPs are manufactured under factory controlled conditions and can be fabricated to fit nearly any building design. The result is a building system that is extremely strong, energy-efficient and cost-effective. Building with SIPs will save you time, money and labor.
What is SIP in construction?
SIPs are manufactured under factory controlled conditions and can be fabricated to fit nearly any building design. The result is a building system that is extremely strong, energy-efficient and cost-effective. Building with SIPs will save you time, money and labor.
Why is SIP important?
A SIP home or commercial building allows better control over indoor air quality because the airtight building envelope limits incoming air to controlled ventilation which filters out contaminants and allergens.
Is SIP insulation energy efficient?
SIPs are known to be about 50% more energy-efficient than traditional timber framing. A SIP building envelope has minimal thermal bridging and delivers excellent airtightness, which lends itself ideally to LEED and net-zero-ready building standards. Healthier Air Quality.
Does SIP insulation cause mold?
The SIP envelope doesn't have the voids or thermal bridging of conventional stick framing that can cause condensation leading to potentially hazardous mold, mildew or rot. SIPs are highly energy-efficient and therefore contribute positively to the environment by reducing CO2 levels.
Are SIPs expensive?
The cost of building with structural insulation panels SIPs generally costs about the same as construction with a wooden frame. Lower costs are also due to reduced construction time (a single storey home can be built in 5 days) and less material wastage from the job.
Is Pirmax and SIPs the same thing?
Pirmax insulation (PIR) is a closed cell polyisocyanurate foam core panel which is light weight, making it easy to handle and can be fixed to any substrate and application. It is available in varying thicknesses and R-values.
Applications of Pirmax and SIPs
Pirmax insulation has wide range of applications and can be used in both residential and commercial settings. Specifically, Pirmax insulation can be used for insulating roofs, internal and external wall cavities, ceilings, underfloor area, and air-conditioning ducts in commercial and residential settings.
Where were SIPs made?
The Forest Products Laboratory in Madison, Wisconsin introduced the idea of what is now known as Structural Insulated Panels (SIPs) in 1935. The Laboratory's prototype panels consisted of framing members, plywood and hardboard sheathing, and insulation.
What is structural insulation panel?
Structural Insulated Panels are an option for part of the enclosure assembly that can help achieve these goals. SIPs do an impressive job of slowing down the transfer of heat, air, and vapor through the assembly. They also dramatically reduce the drying potential of the enclosure, lessening its ability to recover from inadvertent water intrusion. Such an airtight assembly with great thermal resistance can result in a high-performance and durable enclosure if detailed and built correctly, or it can result in the rapid rot and decay of a building's primary structure if detailed or built incorrectly. Reference Building Science Corporation's Building Science Insight BSI-028: Energy Flow Across Enclosures.
Who made the first foam core insulation?
Frank Lloyd Wright used a form of structural insulated panels in the Usonian homes built in the 1930's and 1940's. In 1952, Alden B. Dow created the first foam core SIPs which were being mass-produced by the 1960's. (Morley)
Can SIPs be used as shear walls?
SIPs panels are acceptable to use as shear walls in all seismic design categories. A structural engineer should determine if a secondary structural system is required based on the design loads. To date, the tallest structure constructed exclusively of SIPs is four stories.
When were SIP panels used?
SIP systems were used by Woods Constructors of Santa Paula, California in their homes and apartments from 1965 until 1984.
What is SIP insulation?
The rigid insulation core of the SIP acts as a web, while the sheathing fulfills the function of the flanges. SIPs combine several components of conventional building, such as studs and joists, insulation, vapor barrier and air barrier.
How long do the three pieces of polyurethane stay in the clamping device?
The three pieces must stay in the clamping device until the glue has cured. When manufacturing a panel with a polyurethane core pressure and heat are both generated from the expansion of the foam during the foaming process. The skins are set in a large clamping device which functions as a mold.
How long does a SIP cure?
The SIP is left in the mold/press to cure slightly and when removed will continue to cure for several days. Until recently, both of these processes required a factory setting.
What can be used to replace OSB?
Other materials can be used in replacement of OSB, such as plywood, pressure-treated plywood for below-grade foundation walls, steel, aluminum, cement board such as Hardiebacker, and even exotic materials like stainless steel, fiber-reinforced plastic, and magnesium oxide.
How tall is a roof panel?
Typical U.S. height for panels is eight or nine feet (2.44 to 2.75 m). Panels come in widths ranging from 4 to 12 inches thick and a rough cost is $4–$6/ft 2 in the U.S.
When was the footing form for modular homes invented?
This work was the basis for John Thomas Woods, Paul Flather Woods, John David Woods, and Frederick Thomas Woods when they used a similar concept to patent the Footing Form for Modular homes (US Patent #4817353) issued on April 4, 1989.
What is SIP panel?
SIP panels are the easiest method to reach standards for Air Infiltration, R-Values and Continuous Insulation while significantly reducing time and labor.
What is a SIP?
What Are SIPs? Structural insulated panels (SIPs) are a high-performance building system for residential and light commercial construction. SIPs are the preferred choice for builders who have a passion for their craft and want to leave a legacy with their quality work.
RAYCORE Utilizes Proven Framing Practices
RAYCORE SIP roof panels and wall panels combine three labor tasks into one smart panel system. This system utilizes conventional proven building materials: premium Douglas fir members, state-of-the-art high R-value closed cell polyurethane foam, and a foil radiant vapor barrier.
Can I Build With RAY-CORE SIPs Panels?
Although some basic framing knowledge and experience will be required, if you can frame with sticks, you can frame with RAY-CORE SIPs ® . No special training, special plans, expensive engineering, special tools are required. RAY-CORE SIPs Panels exceed or meet all building codes and are considered by officials as standard framing.
Very Affordable - How Your Panels Could Be Free!
On average it will cost about $1350.00 more on a 1500 sq foot home to use RAYCORE's SIP wall panels than sticks and fiberglass or cellulose. This small investment will pay you back in less than three years and save you money throughout your life.
How strong are SIPs?
SIPs structures can withstand harsh weather conditions and extreme climates because when complete, they form a monolithic shell that is seven times stronger than traditional timber frame structures. Beyond providing great structural strength, the monolithic shell gives buildings a solid and robust feel and makes them less susceptible to shifting.
Why are SIPs good for energy?
Buildings with SIPs construction have great energy efficiency because this material is an excellent thermal insulator. 2. Insulating Foam Core. Being an excellent thermal insulator is largely due to the included insulating foam core, an airtight construction, and an energy-conserving ventilation system.
Why are SIPs green?
Also, the great insulation it provides helps keep the energy consumption of buildings low , which is great for the environment.
Why is ventilation important in SIPs?
Since SIPs are typically airtight, special attention must be accorded to ventilation in buildings with this kind of construction because adequate air circulation is critical to a healthy living space.
What are the disadvantages of SIPs?
One of the main disadvantages of SIPs buildings is that they are prone to moisture damage. This is mainly because the composition of SIPs panels includes wood, which is susceptible to rot, mildew, or mold.
Why use panel offcuts?
To further reduce the waste and minimize the environmental impact, some manufacturers go the extra mile of using panel offcuts to make spline connections while others recycle materials wherever possible. Minimal waste isn’t just great for the environment; it also means a lower cost of construction waste disposal. 8.
Do SIPs require bricklayers?
Additionally, SIPs structures don’t require bricklayers to build the inner leaf of a structure – a common process with conventional building systems. Ultimately, SIPs construction is less labor-intensive than many, if not all, traditional construction methods. 12. Ease of Construction in Sites With Difficult Access.

Introduction
Description
- Structural insulated panels are composed of an insulated foam core between two rigid board sheathing materials. The foam core is generally one of the following: expanded polystyrene (EPS), extruded polystyrene (XPS), and polyurethane foam (PUR). With EPS and XPS foam, the assembly is pressure laminated together. With PUR and PIR, the liquid foam is...
Lessons Learned
- The Juneau, Alaska Roof Reports that have been published (see publications list below) described evidence that interior air infiltration thought the joints in the SIP roof panels indicated premature deterioration of the top of the OSB skin of the roof panel joints. The general conclusion the building science team reported was that the moisture damage was due to evidence of the lack o…
Emerging Issues
- SIPA recently completed Technical Bulletin 008, Wall Aspect Ratios for SIPs, which provides the necessary data for compliance with the IRC and IBC requirements. SIPA and APA (The Engineered Wood Association) recently completed tests to measure the effect of moisture exposure on the structural strength of the panels. Findings are published in Technical Bulletin 009of the Structur…
Relevant Codes and Standards
- APA Structural Insulated Panels Product Guide, APA, The Engineered Wood Association
- ANSI/APA PRS 610.1 Standard for Performance Rated SIPs in Wall Applications
- ASTM Standard has been proposed to address limit state design.
- International Residential Code Section R610: Structural Insulated Panel Wall Construction
Additional Resources
- Details
1. APA CAD Details for Structural Insulated Panels 2. International Residential Code: Section R610 Structural Insulated Panel Wall Construction Figures 3. Structural Insulated Panel Association, SIPs Construction Details - Publications
1. Analysis of the Seismic Performance of SIPs , Federation of American Scientists. 2. BSI-028: Energy Flow Across Enclosuresby Lstiburek, J. 2009. 3. Builder's Guide to Structural Insulated Panels (SIPs) for all Climatesby Lstiburek, J. Somerville, MA: Building Science Press, 2008. 4. Bu…