GreenGuard XP Series Fanfold Underlayment 0.25″ x 4′ x 50′

XP Series Fanfold Underlayment- Reflective Facer 1-Side

Superior stiffness for the smoothest finish
Plastic facers on both sides enhance durability
Available with a reflective coating that qualifies as a radiant barrier

SKU: 50461 Category: Fanfold

Description

The extruded polystyrene (XPS) foam offers superior stiffness, so your siding job has the smoothest finish possible. The underlayment is extra durable, thanks to flexible plastic facers on both sides. Plus it’s perforated to allow moisture vapor to escape. The cut-and-fold hinge design ensures it lays flat. A perforated reflective facer that can enhance thermal performance is also available.

Kingspan GreenGuard® XP14 Siding Underlayment comprises ¼” thick closed-cell polystyrene (XPS) with perforated capsheets on both sides. It is configured in fanfolded bundles 4’ x 50’ with
cut-n-fold hinges. It is lightweight and easy to cut and install. It is designed to be used as a “leveling board”, added insulation and added moisture protection in installation of new vinyl siding over old siding. It is available with a reflective surface on one side, Kingspan GreenGuard® XFP14 Siding Underlayment, for added energy efficiency. Superior Stiffness for the Smoothest
Finish Panel rigidity, water-resistance, durability, easy cutting and excellent lay-flat properties make this product the very best fanfold siding underlayment.

Product Data Table

Typical Physical Properties
Property	Test Method	XP14	XFP14	XP38	XFP38
R-value¹ (°F.ft².hr / Btu)¹	ASTM C 518 (@75°F Mean Temperature)	1.0	3.0	1.5	3.6
Water Vapor Permeance (perm)	ASTM E 96 Procedure A	1.7	1.7	1.3	1.3
Water Absorption (max,% by Volume)	ASTM C 272	2.0	2.0	2.0	2.0
Compressive Strength (psi @ 10% deflection)	ASTM D 1621	12	12	14	14
Fire Characteristics² Flame Spread Smoke Developed	ASTM E 84/UL 723	25 250	25 250	10 45-140	10 45-140

Dimensions / Packaging
	XP14	XFP14	XP38	XFP38
Length³	50′	50′	50′	50′
Width³	4′	4′	4′	4′
Nominal Thickness	1/4″	1/4″	3/8″	3/8″
Square Feet/Pallet	9,000	9,000	6,000	6,000