For the best fanfold siding underlayment available, choose the XP Series. The extruded polystyrene (XPS) foam offers superior stiffness, so your siding job has the smoothest finish possible. The underlayment is extra durable, thanks to the flexible plastic facers. The perforated reflective facer enhances thermal performance while allowing moisture vapor to escape. And, the cut-and-fold hinge design ensures it lays flat.
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