UNDER SLAB APPLICATIONS SlabShield insulation was designed specifically for use under concrete slabs. We have also designed a thinner version of SlabShield for lightweight concrete applications. Both products give you a vapor barrier and significant thermal performance in one user friendly product. The products have a layer of closed cell polyethylene foam applied to both sides of a reflective layer. The closed cell foam is a vapor barrier and protects the aluminum from the chemical reaction that would occur with uncured concrete. All you need to apply SlabShield is a razor knife and tape (Tape is necessary for a complete vapor barrier to be achieved). Simply roll the product to the desired length and cut. Compare that to working with 4' x 8' board insulation and you'll soon see the time savings of working with SlabShield. Another difference between SlabShield and the foam boards is its ability to mold itself to the contours of your grade. SlabShield is flexible enough to adjust to the high and low areas helping to create a stronger finished concrete pour. SlabShield also does not crack or crumble when faced with the normal abuses the job site throws at it.