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The recommended adhesive for attaching foam insulation to concrete is typically polyurethane adhesive. This type of adhesive is specifically designed to bond various materials and provides strong adhesion to both foam and concrete surfaces. Polyurethane adhesives are moisture-resistant and can expand slightly upon curing, which helps to fill gaps and create a strong bond.

While latex adhesive may generally be used for lighter applications, it does not offer the same strength and bonding capabilities necessary for securely attaching foam insulation in outdoor or high-stress environments. Silicone adhesive is more suited for applications needing flexibility and weather resistance but may not adhere as effectively to foam insulation compared to polyurethane options. Epoxy adhesive offers strong bonding but is more commonly used in demanding structural applications, which may not be as practical or necessary for standard foam insulation attachment to concrete.

Therefore, polyurethane adhesive stands out as the most suitable choice, as it combines the necessary strength, adaptability, and compatibility with both concrete and foam insulation materials.