Multi-material sheathing system with sustained thermal insulation performance

A sheathing system to externally envelope at least a portion of a building structure, the system comprising:

• a first structural layer having a first surface and a second surface opposite the first surface;
• a second structural layer having a fifth surface and a sixth surface opposite the fifth surface;
• an insulation layer having a third surface and a fourth surface opposite the third surface, the third surface of the insulation layer being at least partially secured to the second surface of the first structural layer and the fifth surface of the second structural layer being at least partially secured to the fourth surface of the insulation layer, the insulation layer being formed from a foamable composition comprising:
• a) a polymer matrix composition;
• and
• b) a blowing agent composition comprising 3 wt. % or less of a fluorinated alkene and at least 1.5 wt. % CO2, based on a total weight of the foamable composition;
• and
• a barrier coating present on each surface of the insulation layer in a total amount between 3 g/m2 and 225 g/m2, the barrier coating being formed from a barrier coating composition comprising a semi-crystalline polymer and at least one wetting agent, the barrier coating composition having a surface tension no greater than 10 mN/m above a surface energy of the polymer foam and a viscosity between 50 cP and 175 cP at 30% solids or less,
• wherein the sheathing system has an 180-day R/in value of at least 4.8 and a compressive strength between 10 and 110 psi, measured in accordance with ASTM C578.