Choosing the right adhesive for foam insulation boards can significantly impact energy efficiency and project durability. Polyurethane adhesive glue stands out as the top choice for most foam insulation applications due to its superior bonding strength, moisture resistance, and versatility across various environmental conditions.

Key Takeaways

• Polyurethane (PU) adhesives offer the strongest and most durable bond for foam insulation boards
• Different foam types require specific adhesive formulations for optimal performance
• Temperature and moisture conditions significantly impact adhesive selection and performance
• Proper application techniques ensure maximum bond strength and energy efficiency
• Consider health and environmental factors when selecting foam insulation adhesives

Understanding Foam Insulation Boards and Their Adhesive Requirements

Foam insulation boards have become increasingly popular in construction and renovation projects due to their exceptional thermal properties. These lightweight, rigid panels provide excellent insulation value and are relatively easy to install. However, their effectiveness largely depends on proper installation, which includes using the right adhesive.

Different types of foam insulation boards exist in the market, including expanded polystyrene (EPS), extruded polystyrene (XPS), polyisocyanurate (polyiso), and phenolic foam boards. Each type has unique properties that influence adhesive compatibility. For instance, some foams are more sensitive to solvent-based adhesives that might dissolve or damage their structure.

When selecting an adhesive for foam insulation board, several factors come into play: adhesive strength, temperature resistance, moisture resistance, cure time, and compatibility with both the foam material and the substrate. The right adhesive ensures longevity and maximizes the insulation's energy-saving capabilities.

According to the Department of Energy, properly installed insulation with appropriate adhesives can reduce energy costs by up to 20% while providing a more comfortable living environment. This makes the choice of adhesive for foam insulation board a crucial decision in any insulation project.

Types of Adhesives for Foam Insulation Boards

The market offers various adhesive options for foam insulation boards, each with distinct characteristics suitable for different applications. Understanding these options helps in making informed decisions for specific insulation projects.

Polyurethane (PU) Adhesives

Polyurethane adhesive stands as the premier choice for most foam insulation applications. PU glue creates extremely strong bonds with foam materials and various substrates. Once cured, polyurethane adhesive glue forms a water-resistant and durable connection that maintains its integrity even under harsh conditions.

One of the remarkable properties of polyurethane pu glue is its expanding nature during curing, which fills gaps and creates an airtight seal—enhancing the insulation's effectiveness. This expansion capability makes it particularly suitable for uneven surfaces or when working with slightly warped insulation boards.

Research from the Adhesive and Sealant Council indicates that polyurethane adhesive glue maintains its bond strength in temperatures ranging from -40°F to 200°F (-40°C to 93°C), making it suitable for all climate zones. This versatility explains why it's often the first recommendation when discussing how to glue foam insulation effectively.

Construction Adhesives

Construction adhesives, particularly those labeled specifically for foam, offer another solution for installing insulation boards. These adhesives typically come in caulk tubes and provide strong initial tack, allowing boards to grip quickly to vertical surfaces without mechanical fasteners during cure time.

Many construction adhesives for foam are modified versions of other adhesive types, often incorporating properties that make them more suitable for foam materials. Some premium construction adhesives include cement mixer putty putty components that improve their grab and filling properties when working with uneven surfaces.

While effective for many applications, construction adhesives generally don't offer the same level of temperature resistance or moisture protection as polyurethane options. However, they remain popular for interior applications where extreme conditions aren't a concern.

Epoxy Adhesives

Epoxy-based adhesives provide exceptional bond strength and chemical resistance for foam insulation applications. They form rigid bonds that resist both heat and cold extremely well, making them suitable for demanding environments.

Epoxies typically come in two-part systems that require mixing before application. While this adds a step to the installation process, it allows for chemical curing that isn't dependent on air exposure, unlike some other adhesives. This makes epoxies ideal for large-scale applications where quick, consistent curing is beneficial.

According to a study by the Building Science Corporation, epoxy adhesives maintain their structural integrity even in high-humidity environments, making them excellent choices for basement insulation projects or regions with significant moisture concerns.

Acrylic Adhesives

Water-based acrylic adhesives offer an environmentally friendly option for securing foam insulation boards. With low VOC emissions and minimal odor, they're preferred for indoor projects where air quality is a concern.

Acrylic adhesives provide good initial grab and create a flexible bond that can accommodate minor movement between the insulation and substrate. This flexibility can be advantageous in structures that experience thermal expansion and contraction. However, they typically don't match the ultimate strength of polyurethane or epoxy options.

The Environmental Protection Agency has recognized certain acrylic adhesive formulations in their Safer Choice program, highlighting products that perform well while using ingredients that are safer for human health and the environment.

Matching Adhesives to Specific Foam Types

Different insulation foam materials have unique chemical compositions and physical properties that affect their compatibility with various adhesives. Matching the correct adhesive to your specific foam type is crucial for optimal performance.

EPS (Expanded Polystyrene) Foam

EPS foam, commonly known as white foam or beadboard, requires careful adhesive selection because solvents in some adhesives can dissolve or damage its structure. When looking to glue foam insulation of the EPS variety, water-based and solvent-free adhesives are typically recommended.

Modified acrylic adhesives work well with EPS, as do specifically formulated polyurethane pu glue products designed to be compatible with polystyrene foams. Construction adhesives labeled "foam safe" or "foam board adhesive" are generally suitable for EPS applications as well.

Research from the EPS Industry Alliance indicates that properly bonded EPS insulation maintains its R-value (insulation effectiveness) for the life of the building, making appropriate adhesive selection an important long-term investment.

XPS (Extruded Polystyrene) Foam

XPS foam, often recognized by its blue, pink, or green color, has a denser, more closed-cell structure than EPS. This makes it less susceptible to damage from adhesive solvents, but proper adhesive selection remains important.

For XPS boards, polyurethane adhesive glue typically provides excellent results, creating strong bonds with both the foam and common building substrates. Many manufacturers specifically recommend PU adhesives when installing XPS foam boards in foundation walls or exterior insulation applications.

According to the Extruded Polystyrene Foam Association, XPS boards bonded with appropriate adhesives can maintain performance even after repeated freeze-thaw cycles, making them excellent for below-grade applications where moisture management is critical.

Polyiso (Polyisocyanurate) Foam

Polyiso insulation boards, known for their high R-value per inch, are compatible with a broader range of adhesives due to their foil or fiberglass facings that protect the foam core. These facings also provide an excellent surface for adhesive bonding.

Both polyurethane adhesive glue and construction adhesives work well with polyiso boards. In commercial roofing applications, specialized polyurethane adhesives are often used to bond polyiso insulation to various roof decks and membrane materials.

The Polyisocyanurate Insulation Manufacturers Association notes that properly installed polyiso with appropriate adhesives can contribute significantly to building energy efficiency and reduce the overall carbon footprint of structures.

Phenolic Foam

Phenolic foam insulation, while less common than other types, offers exceptional fire resistance and thermal performance. It requires specialized adhesive considerations due to its unique chemistry.

Manufacturers of phenolic foam typically recommend specific adhesive systems designed for compatibility with their products. In many cases, two-component pu adhesive glue systems are preferred for their chemical compatibility and performance characteristics with phenolic foams.

Research from the Building Research Establishment (BRE) shows that phenolic foam insulation properly installed with compatible adhesives maintains its exceptional thermal performance over decades of service life.

Performance Factors in Foam Insulation Adhesives

Beyond basic compatibility, several performance factors should influence your adhesive selection for foam insulation boards. These factors directly impact the long-term effectiveness of your insulation system.

Temperature Resistance

Adhesives used for foam insulation must withstand the temperature ranges expected in their application environment. This includes both extreme seasonal variations and temperatures during installation.

High-performance polyurethane glue typically maintains its bond integrity from -40°F to well above 200°F (-40°C to 93°C), making it suitable for most climate zones. Other adhesives may have more limited temperature ranges, potentially leading to bond failure in extreme conditions.

The International Building Code specifies that insulation systems must maintain their integrity under expected temperature conditions, making temperature resistance a compliance issue in many jurisdictions. The Oak Ridge National Laboratory has conducted extensive testing showing that adhesive selection significantly impacts thermal bridging and overall insulation system performance across temperature ranges.

Moisture Resistance

Moisture exposure, whether from exterior weather, interior condensation, or ground sources, can compromise adhesive bonds if improper products are selected. Water-resistant formulations are essential for many insulation applications.

Glue PU formulations offer excellent moisture resistance once cured, creating waterproof bonds that protect the insulation system. This makes polyurethane adhesives particularly valuable for below-grade applications, exterior insulation, and areas with high humidity levels.

According to a study by the Building Science Corporation, moisture-resistant adhesives used to secure foam insulation in crawl spaces can significantly reduce relative humidity levels throughout the home, improving overall energy efficiency and indoor air quality.

Cure Time and Working Time

Different adhesives offer varying cure times and working times, which affect installation efficiency and project timelines. Fast-setting formulations might be preferred for quick installations, while longer working times allow for adjustments during positioning.

Typically, polyurethane adhesive glue products offer initial grab within minutes and achieve full cure within 24 hours. Construction adhesives often provide stronger initial tack but might require longer complete curing times. Understanding these timeframes helps plan installation schedules effectively.

The Adhesive and Sealant Council reports that temperature and humidity significantly impact cure times, with some adhesives curing up to 50% faster in warm, humid conditions compared to cool, dry environments. Professional installers often adjust their adhesive selection based on ambient conditions to maintain productivity.

Gap Filling Capability

Substrates for foam insulation are rarely perfectly flat, making an adhesive's ability to fill irregular surfaces crucial for creating a continuous thermal barrier. Adhesives with gap-filling properties ensure full contact between the insulation and the substrate.

Expanding polyurethane pu glue excels in this regard, as its expansion properties fill voids and create an airtight seal. This expansion actually improves the overall thermal performance of the insulation system by eliminating air gaps that could otherwise allow thermal bridging.

Research from the National Renewable Energy Laboratory demonstrates that proper gap filling with appropriate adhesives can improve effective R-value of insulation systems by up to 15% compared to installations with partial contact between insulation and substrates.

Application Techniques for Optimal Results

Even the best adhesive for foam insulation board won't perform properly without correct application techniques. Following these best practices ensures maximum bond strength and insulation effectiveness.

Surface Preparation

Proper surface preparation is crucial for adhesive performance. Both the substrate and the insulation board surfaces must be clean, dry, and free of dust, grease, or loose materials that might interfere with adhesion.

For concrete or masonry substrates, removing efflorescence (white powdery deposits) is essential before applying adhesive. For wood or metal substrates, removing any rust, loose paint, or oils will significantly improve bond strength. Some substrates might benefit from primers designed to enhance adhesion with specific foam types.

According to the Spray Polyurethane Foam Alliance, surface preparation accounts for approximately 80% of an adhesive's ultimate bond strength, making it the most critical step in the installation process. Professional installers often use HEPA vacuums and specialized cleaners to ensure optimal bonding surfaces.

Application Patterns

The pattern used when applying adhesive for foam insulation board affects both bond strength and thermal performance. Different patterns are recommended for various applications and board sizes.

For vertical applications, such as walls, a serpentine or S-pattern of continuous polyurethane adhesive glue beads typically provides excellent hold while allowing for some adjustment during placement. For ceiling applications, a more comprehensive coverage pattern might be necessary to counter gravity's effects.

Here are some common application patterns:

• Perimeter and dab pattern: Adhesive around the board edges with additional spots in the center
• Serpentine pattern: Continuous wavy lines across the board
• Grid pattern: Perpendicular lines forming squares
• Full spread: Complete coverage for maximum bond (typically used with trowel-applied adhesives)

The Department of Energy's Building America program research shows that proper adhesive patterns can significantly reduce thermal bridging and air infiltration compared to mechanical fastener-only installation methods.

Temperature and Environmental Considerations During Application

Ambient conditions during installation significantly impact adhesive performance. Most adhesives have specific temperature ranges for optimal application, typically between 40°F and 100°F (4°C and 38°C).

Humidity levels also affect cure times and bond strength, particularly with moisture-cured adhesives like many PU adhesive glue formulations. In extremely dry conditions, misting surfaces lightly with water can actually improve curing for moisture-cured polyurethanes.

The Building Science Corporation recommends avoiding installation during extreme temperature conditions and planning work during moderate temperature periods when possible. Some professional installers use temporary climate control measures when working in adverse conditions to ensure proper adhesive performance.

Combining Adhesives with Mechanical Fasteners

While high-performance adhesives like polyurethane adhesive glue can often support foam boards without additional support, many installation specifications call for combination systems using both adhesives and mechanical fasteners.

This belt-and-suspenders approach provides redundancy and can be particularly important in high-wind zones, seismic regions, or for ceiling applications where failure consequences would be significant.

Typical recommendations include:

• Using adhesive as the primary attachment method for continuous thermal performance
• Adding mechanical fasteners at specified intervals as secondary support
• Ensuring fasteners are appropriate for the specific foam type to prevent compression damage
• Using fastener caps or plates to distribute pressure across the foam surface

The International Code Council's building codes often specify minimum attachment requirements that may include both adhesive and mechanical fasteners, particularly for exterior insulation applications in high-wind regions.

Special Considerations for Different Applications

Different insulation applications present unique challenges that influence adhesive selection and application techniques. Understanding these special considerations ensures optimal performance in each scenario.

Interior Wall Insulation

When installing foam insulation on interior walls, considerations include indoor air quality, noise during installation, and compatibility with interior finishes that will cover the insulation.

Low-VOC adhesives are preferable for interior applications to minimize occupant exposure to potentially harmful emissions during curing. Construction adhesives and water-based alternatives often provide this benefit while maintaining adequate bond strength for vertical applications.

For retrofitting existing walls, rebond foam products with specialized adhesives can provide additional soundproofing benefits while improving thermal performance. The Silent Home Project research shows that properly adhered interior foam insulation can reduce sound transmission by up to 70% compared to uninsulated walls.

Exterior Insulation and Finish Systems (EIFS)

EIFS applications require adhesives that can withstand weather exposure, temperature cycling, and potential moisture intrusion. These systems typically use expanded polystyrene (EPS) insulation boards attached to exterior wall surfaces.

Modified polymer cement mixer putty putty formulations are common in EIFS applications, providing excellent adhesion to both the substrate and the foam insulation. These specialized formulations combine the workability of cement-based products with enhanced flexibility from polymer additives.

According to the EIFS Industry Members Association, proper adhesive application in EIFS systems is crucial for long-term performance, with manufacturer-specified adhesives and application patterns being essential for warranty coverage and system integrity.

Roof and Attic Insulation

Roof and attic insulation applications present unique challenges due to temperature extremes, potential moisture exposure, and gravity effects for overhead installation. Adhesives for these applications must provide exceptional holding power and durability.

High-strength polyurethane adhesive glue is frequently specified for roof applications, often combined with mechanical fasteners for guaranteed long-term performance. Low-rise expanding foam adhesives specifically formulated for roofing applications provide excellent wind uplift resistance.

The National Roofing Contractors Association cites research showing that properly adhered foam insulation in roof systems can extend roof membrane life by moderating temperature fluctuations and reducing thermal stress on the entire system.

Below-Grade and Foundation Insulation

Insulating foundations and below-grade walls requires adhesives with excellent moisture resistance and compatibility with damp conditions. These applications also frequently involve bonding to concrete or masonry surfaces.

Specialized polyurethane glue formulations designed for damp environments perform exceptionally well in these applications. Some formulations actually use moisture to accelerate the curing process, making them ideal for slightly damp foundation walls.

For insulating basement interiors, look for adhesives that maintain flexibility to accommodate foundation movement while providing long-term moisture resistance. The Building Science Corporation research indicates that properly adhered below-grade insulation can reduce basement humidity levels by up to 40% while improving overall energy efficiency.

Health and Environmental Considerations

As with any building material, health and environmental factors are increasingly important considerations when selecting adhesives for foam insulation. Understanding these aspects helps make informed choices that balance performance with health and sustainability concerns.

VOC Emissions and Indoor Air Quality

Volatile Organic Compounds (VOCs) in adhesives can impact indoor air quality during and after installation. Many traditional adhesives contain solvents that release VOCs as they cure, potentially affecting occupant health.

Low-VOC and zero-VOC alternatives have become increasingly available across adhesive categories. Water-based acrylic adhesives typically offer the lowest emissions, while some polyurethane adhesive glue formulations now provide low-VOC options without sacrificing performance.

The Environmental Protection Agency's Indoor airPLUS program recommends using low-VOC adhesives for all interior applications to maintain healthy indoor air quality. Many green building certification programs like LEED and WELL Building Standard award points for using low-emission adhesive products.

Sustainability and Life-Cycle Assessment

The environmental impact of adhesives extends beyond emissions to include raw materials, manufacturing processes, and end-of-life considerations. Bio-based alternatives to traditional petroleum-derived adhesives are gaining market share.

When evaluating sustainability, consider:

• Renewable content percentage in the adhesive formulation
• Manufacturing energy requirements
• Packaging waste and recyclability
• Expected service life (longer-lasting installations have lower lifetime impact)
• End-of-life scenarios for the insulation system

The Athena Sustainable Materials Institute notes that while adhesives represent a small percentage of a building's material mass, their contribution to energy efficiency through proper insulation installation can significantly reduce the building's lifetime environmental impact.

Safety During Installation

Installer safety is another important consideration when selecting adhesives. Some products require specific protective equipment and ventilation during application.

Isocyanates in some polyurethane adhesive glue products require appropriate respiratory protection during application. Water-based alternatives typically pose fewer respiratory concerns but may require different handling practices.

The Occupational Safety and Health Administration (OSHA) provides specific guidelines for working with various adhesive types, and manufacturer safety data sheets (SDS) contain essential information about proper handling, exposure limits, and required protective equipment.

Troubleshooting Common Adhesive Issues

Even with careful product selection and application, adhesive issues can sometimes arise. Knowing how to identify and address these problems helps ensure successful foam insulation installation.

Poor Initial Bond

If foam boards aren't adhering properly during installation, several factors could be responsible:

• Inadequate surface preparation
• Improper adhesive for the substrate or foam type
• Application outside of recommended temperature range
• Insufficient adhesive quantity
• Exceeded open time (applied too long before joining surfaces)

The solution typically involves reassessing surface conditions and adhesive selection. In some cases, using a primer or surface conditioner can dramatically improve initial bond strength, particularly on problematic surfaces like dusty concrete or certain metals.

Bond Failure Over Time

If previously secure foam boards begin to detach, investigate these potential causes:

• Moisture intrusion affecting the adhesive bond
• Temperature extremes beyond the adhesive's performance range
• Structural movement exceeding the adhesive's flexibility
• Chemical exposure degrading the adhesive
• UV exposure (for exterior applications without proper covering)

Remediation typically involves removing affected boards, addressing the underlying cause, and reinstalling with appropriate adhesive systems for the conditions. In severe cases, combining adhesives with mechanical fasteners might be necessary to prevent recurrence.

Foam Damage from Incompatible Adhesives

When adhesives damage foam boards—typically evidenced by melting, cratering, or discoloration—it indicates chemical incompatibility. This is particularly common with solvent-based adhesives applied to polystyrene foams.

Always test adhesives on a small foam sample before full application if compatibility is uncertain. If damage occurs, switch to foam-safe alternatives specifically formulated for your insulation type. Manufacturers often provide compatibility charts for their foam products.

Professional Tips for Selecting and Using Foam Insulation Adhesives

Drawing from professional experience, these tips can help ensure successful selection and application of adhesives for foam insulation boards.

Consult Manufacturer Recommendations

Both foam insulation and adhesive manufacturers provide specific recommendations for their products. These guidelines represent tested compatibility and performance and should be your first reference point.

Many manufacturers offer technical support hotlines where experts can provide specific recommendations for challenging applications or unusual conditions. Manufacturer-approved systems often come with warranty protection that might not apply when using alternative products.

Test Before Full Application

When using an adhesive for the first time or in demanding conditions, conducting small-scale tests can prevent costly failures. Apply the adhesive to test sections under similar conditions to your full installation.

Allow the test assembly to cure completely, then evaluate bond strength and any potential foam damage. This small investment of time can provide valuable insights into expected performance and identify potential issues before they affect the entire project.

Consider System Compatibility

Foam insulation doesn't exist in isolation but is part of a larger building system that may include air barriers, vapor retarders, exterior finishes, and fire protection elements. Adhesive selection should account for compatibility with these adjacent materials and systems.

For example, some adhesives may interact negatively with certain vapor barrier materials or interfere with the performance of intumescent fire protection coatings. Always consider the entire assembly when selecting adhesives for specific applications.

Factor in Life-Cycle Costs

While premium adhesives like high-performance polyurethane pu glue may have higher initial costs, they often prove economical when considering the entire lifespan of the insulation system.

Factor in these considerations when evaluating adhesive costs:

• Installation labor savings from easier application or faster cure times
• Reduced callbacks or repairs from more reliable bonds
• Energy savings from better thermal performance due to complete adhesion
• Extended service life of the entire insulation system

The Building Owners and Managers Association cites research showing that while premium construction materials may increase initial costs by 2-5%, they often reduce lifetime operational costs by 10-20% through improved energy efficiency and reduced maintenance.

Conclusion: Selecting the Best Adhesive for Your Foam Insulation Project

Choosing the right adhesive for foam insulation board involves balancing multiple factors including the specific foam type, installation environment, performance requirements, and health considerations. While polyurethane adhesive glue remains the market leader for most applications due to its exceptional strength and versatility, other options provide valuable alternatives for specific situations.

For general-purpose foam insulation board installation in typical building environments, premium polyurethane glue offers the most reliable performance. For interior applications where air quality is a priority, low-VOC construction adhesives or acrylic-based alternatives provide good performance with reduced emissions.

Remember that even the best adhesive performs poorly if improperly applied. Following manufacturer guidelines for surface preparation, application patterns, and curing conditions remains essential for any successful insulation project.

As building energy codes continue to tighten and high-performance buildings become the norm rather than the exception, the role of proper insulation installation—including appropriate adhesive selection—will only grow in importance. Investing time in understanding and selecting the right adhesive pays dividends through improved energy efficiency, building durability, and occupant comfort.

Frequently Asked Questions

What is the strongest adhesive for foam insulation boards?

Polyurethane-based adhesives typically provide the strongest bond for foam insulation boards. These polyurethane adhesive glue products create chemical bonds with the foam and substrate while expanding to fill gaps and irregularities. For extremely demanding applications, two-component polyurethane systems offer maximum strength and durability.

Can I use regular construction adhesive for foam board insulation?

Regular construction adhesives can be used for some foam board applications, but you must ensure they're compatible with your specific foam type. Many standard construction adhesives contain solvents that can damage polystyrene foams. Look for products specifically labeled as "foam-safe" or "foam board adhesive" to avoid damaging your insulation.

How do I adhere foam insulation to a concrete wall?

For concrete walls, first ensure the surface is clean, dry, and free of dust or loose material. Apply a high-quality polyurethane adhesive glue in a continuous serpentine pattern or perimeter-and-dab pattern to the back of the foam board. Press the board firmly against the concrete surface and hold in place momentarily until initial grab is achieved. For below-grade applications, use moisture-resistant formulations specifically designed for basement environments.

What adhesive works best for exterior foam insulation?

For exterior applications, weather-resistant polyurethane pu glue formulations provide excellent performance. These adhesives resist moisture, temperature cycling, and UV exposure when covered by appropriate finishing systems. For EIFS applications, manufacturer-specified adhesives (often cement-based with polymer modifications) are crucial for system warranty and performance.

How much adhesive do I need for foam insulation boards?

Coverage rates vary by product and application pattern, but typically one 28-32 oz tube of adhesive covers approximately 32-50 square feet of foam board when applied in a serpentine pattern. For perimeter-and-dab applications, coverage may extend to 60-70 square feet per tube. Always check manufacturer specifications for your specific product and follow recommended application patterns for optimal performance.

Is spray foam adhesive good for insulation boards?

Aerosol spray foam adhesives can be convenient for small projects or detail work, but generally lack the strength and durability of professional-grade tube or cartridge adhesives for large-scale insulation board installation. While they offer quick initial tack, their long-term bond strength and temperature resistance are typically inferior to professional polyurethane adhesive glue products.

How long does adhesive take to set when installing foam board?

Initial grab typically occurs within 5-30 minutes depending on the adhesive type and environmental conditions. Full cure times range from 24 hours for most polyurethane formulations to 7 days for some construction adhesives. Temperature and humidity significantly impact cure times—colder temperatures generally extend both initial set and full cure periods.

Can I use Gorilla Glue for foam insulation?

Gorilla Glue is a brand of polyurethane adhesive that can work for some foam insulation applications. However, its expansion rate may be higher than adhesives specifically formulated for foam insulation boards. While suitable for small repairs or limited applications, professional-grade glue pu products designed specifically for insulation typically provide more predictable results for full-scale installations.

# The Best Adhesive for Foam Insulation Board: Professional Guide for Strong, Durable Bonds

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