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Kingspan GreenGuard XFP38 Fanfold Underlayment

Best choice ⅜” Thick XPS Underlayment with Premium Facers

Configured in fanfolded bundles 4’ x 50’ with cut-n-fold hinges which improves its ability to lay flat. It is lightweight, easy to cut, and install.

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Premium level ¼” XPS fanfold with reflective facer and cut-and-fold hinges

GreenGuard XFP14 Fanfold Underlayment

Premium level ¼” XPS fanfold with reflective facer and cut-and-fold hinges
Premium choice underlayment ¼” thick XPS; best facers, cut-and-fold hinges
Premium level ⅜” XPS fanfold with our best facers, cut-and-fold hinges

GreenGuard XP14 Fanfold Underlayment

Premium choice underlayment ¼” thick XPS; best facers, cut-and-fold hinges

GreenGuard XP38 Fanfold Underlayment

Premium level ⅜” XPS fanfold with our best facers, cut-and-fold hinges
Kingspan GreenGuard XFP38 fanfold underlayment on a transparent background

GreenGuard XFP38 Fanfold Underlayment

Premium choice ⅜” (0.375) thick closed-cell extruded polystyrene (XPS) fanfold underlayment with reflective surface on one side for added energy efficiency for use in replacement siding operations; designed to be used as a “leveling board”, adding insulation and moisture protection in installation of new vinyl siding over old siding. It is configured in fanfolded bundles 4’ x 50’ with cut-n-fold hinges which improves its ability to lay flat. It is lightweight, easy to cut, and install.

Product Highlights

  • Reflective surface on one side for added energy efficiency

  • Kingspan's top-of-the-line facer on the other side

  • Lay flat cut-and-fold hinges

  • Perforated to allow moisture vapor to escape

  • Explore GreenGuard