How to Choose the Right SIP Manufacturer
There are more than 40 active SIP manufacturers in North America. Picking the wrong one affects your project for decades. Joe Pasma, PE breaks down the five things that actually predict manufacturer performance -- and the red flags he has seen in 40 years of being inside the plants.
By Joe Pasma, PE | PGS Consulting LLC, Licensed Professional Engineer | 40+ Years in SIP Engineering, Manufacturing, and Forensic Analysis
LAST UPDATED: JUNE, 2026
Key Takeaways
There are roughly 40 to 45 active Structural Insulated Panel (SIP) manufacturers in North America -- and they are not all the same.
The right manufacturer for your project depends on five things: core type, code compliance, manufacturing quality, engineering support, and project fit.
A current third-party compliance report like an ICC-ES evaluation report or CCMC report is the clearest indicator that a manufacturer's panels have been independently tested and verified to comply with the intent of the building codes.
SIPA membership is voluntary. It is a useful indicator of industry engagement, but it does not tell you whether a manufacturer's panels will perform on your specific project.
The most common mistake is choosing a SIP manufacturer based on price or proximity alone -- without asking the questions that actually predict performance.
An independent SIP engineer who has been inside the plants and reviewed the code reports can compress your evaluation process significantly.
There are more than 40 active Structural Insulated Panel (SIP) manufacturers in North America. A complete, verified list of those manufacturers is available on the PGS Consulting SIP Manufacturers resource page.
But knowing who makes SIPs and knowing which one is right for your project are two very different things.
Choosing a SIP manufacturer is not like ordering lumber. You are not picking a commodity off a price sheet. You are choosing a building system -- one that affects structural performance, energy efficiency, code compliance, and long-term durability. That decision follows the building for its entire life.
After 40 years working in SIP engineering, manufacturing, and forensic analysis, Joe Pasma, PE has seen what separates good manufacturer decisions from expensive ones. This article breaks it down into a clear, practical framework -- five steps, plain language, no engineering degree required.
Not All SIP Manufacturers Are the Same -- Here Is What to Look For
On the surface, most SIP manufacturers look similar. Websites show clean panels, finished homes, and lists of specs. It is hard to tell from a homepage whether a manufacturer runs a tight production line or a loose one.
The differences that actually matter are not necessarily visible on a spec sheet:
How consistent is the bond between the core and the facing?
What does their quality control process actually look like?
Do they have the engineering resources to support your specific project?
What happens when something does not go as planned in the field?
What type of panels are supplied? Blanks, Prefabricated, Ready To Assemble (RTA)?
What types of facer is supplied?
These are not questions a website answers. They are questions you either know how to ask -- or you don't find out until there is a problem.
Step 1: Start With Core Type & Facers
The first filter is the insulation core. Most SIP manufacturers specialize in one or two core types, and the core type you need is partly determined before you even call a manufacturer.
EPS (Expanded Polystyrene)
The most widely used SIP core. Cost-effective, dimensionally stable, and broadly recognized in building codes. R-value holds steady over the life of the building. Most first-time SIP builders work with EPS.
Best for: Residential and light commercial, budget-conscious projects, broad code compliance.
GPS (Graphite Polystyrene)
EPS with graphite added. Higher R-value per inch than standard EPS. Installs exactly like EPS -- no new tools or processes. Used on projects targeting higher performance or net-zero certification.
Best for: High-performance residential, energy-intensive climate zones, green certification projects.
PUR / PIR
PUR / PIR (Polyurethane-Based)
Highest initial R-value per inch. Thermal performance drifts over time -- long-term aged R-values are lower than the initial rating. EPS and GPS do not drift.
Best for: Commercial, cold storage, projects with tight space constraints and high performance requirements.
OSB (Oriented Strand Board)
The most common facing, offering strong structural performance and large panel sizes.
Best for: Most residential and commercial SIP roof, wall, and floor applications. Large-scale panelized construction
MGO (Magnesium Oxide Faced)
Uses MgO board in place of traditional OSB facing. Different fire resistance and moisture characteristics. Growing category for non-combustibility requirements or enhanced durability.
Best for: Fire-sensitive projects, specific moisture environments, applications where OSB facing is not acceptable.
Once you know which core type fits your project, the list of manufacturers worth evaluating gets much shorter. Most manufacturers produce EPS panels. Fewer produce GPS. PUR/PIR and MgO-faced systems come from a smaller subset of producers.
For a deeper look at how R-values and thermal performance work across core types, the SIP R-Value and Energy Performance guide covers the details without the engineering jargon.
Step 2: Check the Code Report
Once you have a short list based on core type, the next filter is code compliance.
An ICC-ES evaluation report (used in the U.S.) or CCMC report (used in Canada) is a third-party document confirming that a manufacturer's panels have been independently tested and evaluated against specific code requirements. It is the most reliable external signal you have.
A current code report tells you three things:
The panels have been tested by someone other than the manufacturer.
The system meets defined structural and thermal performance criteria.
You have documentation to bring to your building department without a fight.
If a manufacturer does not have a current code report, that does not automatically disqualify them -- but the burden of demonstrating compliance shifts to the builder, the engineer, or the project team. That burden has a cost. For a full breakdown of how SIP code compliance works, the SIP Building Codes and Compliance guide is worth reading before you start any project.
Step 3: Ask About Manufacturing Quality
A code report tells you the system was tested. It does not tell you whether the plant you are ordering from is running well this month.
SIP performance starts on the factory floor. Bond quality between the core and the facing, adhesive consistency, dimensional accuracy, and how panels are handled and stored before shipping -- these are not things you can assess from a website or a brochure.
The manufacturers that perform consistently over the long term tend to share a few characteristics: defined quality control checkpoints during production (not just at final inspection), consistent adhesive application that does not vary by shift or operator, dimensional tolerances that are tracked and enforced, and clear documentation that travels with the panels to the jobsite.
You cannot fully evaluate this from the outside. But you can ask about it directly -- and the quality of the answer tells you a lot.
Questions Worth Asking Before You Commit
- Do you have a current ICC-ES evaluation report or CCMC report? If yes, ask for the report number and check it yourself at icc-es.org.
- What is your quality control process during production? A manufacturer with a real QC system can describe it in plain terms. One that can't is telling you something.
- What dimensional tolerances do you hold? Tight tolerances matter on projects with complex geometries or engineered connections.
- What engineering support do you provide for my project? This means project-specific support, not just a generic installation manual.
- What happens if panels arrive with damage or don't match the drawings? How a manufacturer handles problems tells you more than how they describe their normal process.
- Have you produced panels for projects similar to mine? Climate zone, building type, and structural loads all affect whether a given manufacturer is a good fit.
Step 4: Evaluate Engineering Support
A SIP manufacturer is not just a panel supplier. The best ones function as a technical partner on your project -- providing layout drawings, connection details, sequencing guidance, and support when field questions come up.
What good engineering support actually looks like: panel layout drawings specific to your project (not generic templates), connection details that align with your structural loads and spans, a clear point of contact for field questions during installation, and documentation your installer can actually use on site -- not a 60-page technical manual.
What it does not look like: a general installation guide and a phone number, recommendations to "consult a local engineer" for every question, or slow response times when the crew is waiting on an answer.
The level of engineering support varies widely across manufacturers. Some have in-house engineering teams with decades of SIP-specific experience. Others have limited technical resources and rely on the builder to fill the gaps. Knowing which you are working with before the job starts matters. For a clear picture of what proper SIP installation documentation looks like, the SIP Installation Guide is a useful reference.
Step 5: Match the Manufacturer to Your Project
There is no universally best SIP manufacturer. The right choice is the one that fits your specific project -- not the one with the most polished website or the biggest name in the industry.
Climate zone. A manufacturer that is ideal for a cold-climate residential project in Minnesota may not be the right fit for a commercial build in coastal Florida. Core type, panel thickness, and sealing systems all interact with climate.
Building type. Residential single-family, multi-family, light commercial, and agricultural builds all have different structural and code requirements. Not every manufacturer's system is evaluated for every application.
Installation team experience. If your crew has never installed SIPs, a manufacturer with strong field support and detailed installation documentation is worth more than one that assumes you already know what you are doing.
Project size and timeline. A small regional manufacturer may be a perfect fit for a custom home and completely wrong for a 50-unit development on a tight schedule. Production capacity and lead times are real constraints.
Your code jurisdiction. Some evaluation reports cover specific building types or climate zones. Verify that a manufacturer's code report actually covers your jurisdiction and project type before assuming it does.
Red Flags Joe Has Actually Seen
After 40 years inside SIP plants and on SIP jobsites, a few patterns show up consistently when manufacturer selection goes wrong.
Choosing on price alone. Panel cost is one line item in a full project budget. The cost of a bad manufacturer decision -- in field repairs, schedule delays, code compliance battles, and long-term performance problems -- is a much bigger number. The SIP Cost Guide breaks down how to think about SIP costs across the full project, not just the panel line.
Taking spec sheets at face value. Manufacturers publish the performance numbers their systems achieve under test conditions. Whether those numbers translate to consistent field performance depends on manufacturing quality and installation precision -- neither of which appears on a spec sheet.
Assuming SIPA membership means quality. SIPA membership is voluntary. Several long-standing, well-regarded manufacturers are not SIPA members. Several SIPA members have had well-documented performance issues. Membership is a useful data point, not a quality guarantee.
Skipping the code report check. The most common oversight. A manufacturer tells you their panels are code-compliant. You believe them. Later, the building department asks for documentation and the project stalls. A simple check at icc-es.org takes five minutes and prevents a serious problem.
Not asking about manufacturing consistency. Two panels from the same manufacturer can perform very differently if production quality is not tightly controlled. Bond failures, dimensional variation, and adhesive inconsistency are not visible when the panels arrive -- they show up later in the building's performance and longevity. The SIP Problems and Failures guide covers what these failures actually look like and what drives them.
Have Questions About a SIP Manufacturer?
Joe Pasma, PE has worked with manufacturers, builders, and design teams across North America for more than 40 years. He has been inside the plants, reviewed the code reports, and seen what separates consistent performers from inconsistent ones.
Contact Joe →Frequently Asked Questions About SIP Manufacturers
How many SIP manufacturers are there in North America?
There are roughly 40 to 45 active Structural Insulated Panel manufacturers in North America, spanning the United States, Canada, and Mexico. This includes companies producing EPS, GPS, PUR/PIR, and MgO-based SIP systems. A full verified list is available on the PGS SIP Manufacturers page.
Is SIPA membership a reliable indicator of manufacturer quality?
Not on its own. SIPA membership is voluntary, and several long-standing, well-regarded manufacturers are not members. A current ICC-ES evaluation report or CCMC report is a more reliable indicator of independent third-party verification than membership status alone.
What is an ICC-ES evaluation report and why does it matter?
An ICC-ES evaluation report is a third-party document confirming that a manufacturer's panels have been independently tested and evaluated against specific code requirements. If a manufacturer does not have a current report, the burden of demonstrating compliance falls on the builder, engineer, or project team -- and that burden has a real cost.
Can I choose a SIP manufacturer based on price alone?
Panel cost is one line item in a full project budget. The cost of a poor manufacturer decision -- field repairs, schedule delays, code compliance problems, long-term performance issues -- is typically far larger than the initial savings. Price is worth comparing after you have narrowed the field using code compliance, core type, and engineering support.
What is the difference between EPS, GPS, and PUR/PIR SIPs?
EPS is the most common and cost-effective core -- stable R-value, widely code-recognized. GPS adds graphite to boost R-value per inch without changing the installation process. PUR/PIR offers the highest initial R-value but experiences thermal drift over time, meaning long-term performance is lower than the initial rating. EPS and GPS do not drift. For a full breakdown, see the SIP R-Value and Energy Performance guide.
Does the right SIP manufacturer depend on my climate zone?
Yes, directly. Core type, panel thickness, and sealing system requirements all interact with climate. A manufacturer ideal for a cold-climate project in Minnesota may not be the right fit for a coastal build in Florida. Matching the manufacturer to your climate zone -- and verifying that their code report covers your jurisdiction -- is part of the evaluation process.
How do I evaluate a SIP manufacturer I have never worked with before?
Start with three questions: Do they have a current code report? What does their quality control process look like in production? What engineering support do they provide for your specific project type? Working with an independent SIP consultant who has direct manufacturing experience can compress the evaluation considerably and surface things a website or sales call will not reveal.
What are the most common SIP manufacturer problems Joe Pasma has seen?
The most consistent ones: choosing on price without checking the code report, taking spec sheet performance numbers at face value without understanding manufacturing consistency, assuming SIPA membership indicates quality, and not asking the right questions about what happens when something goes wrong in the field. The SIP Problems and Failures guide covers what these issues look like when they surface in a building.
About the Author
Joe Pasma, PE is a licensed professional engineer with more than 40 years of experience working with Structural Insulated Panels and advanced building systems. His background includes structural engineering, manufacturing operations, installation oversight, and forensic investigation.
Through PGS Consulting LLC, Joe works with manufacturers, builders, architects, building owners, and project teams to improve technical systems, reduce risk, and strengthen building performance.