PL300 adhesive has been suggested to me by an energy auditor.
Here's what I found on the product:
PL 300® Foam Board Adhesive
PL 300 provides dependable adhesion of foam to all types of surfaces, including wood, fiberglass panels, concrete, brick, metal and drywall. It is compatible with foam board insulation. It permanently joins the foam to the substrate without compromising the insulation value of the foam.
• Foam board compatible
• Bonds foam insulation to most common surfaces
• Works on foundation insulation
• Excellent for polystyrene and polyurethane molding and millwork