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XP Series Fanfold Underlayment

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 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.

Typical Physical Properties

Property

Test Method

XP14
XFP14
XP38
XFP38
R-Value
(°F-ft²-h/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 Development
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


1 Specimens were aged and tested in accordance with FTC Rule (16 CFR, Part 460). The R-values shown for GreenGuard®-FP1450, GreenGuard®-XFP14, GreenGuard®-FP38, and GreenGuard®-XFP38 are system R-values calculated in accordance with the “ASHRAE Handbook of Fundamentals” using a ½” uniform, parallel dead air space. The R-values of these products installed without the benefit of a dead air space are 1.0 (GreenGuard®-FP1450 and GreenGuard®-XFP14) and 1.5 (GreenGuard®-XFP38).

2 These numerical flame spread and smoke ratings are not intended to reflect hazards presented by these materials under actual fire conditions (core data).

3 These dimensions apply to each fanfold bundle.


Disclaimer

Residential Applications

Residential Products

Give your homes energy-efficient, water managed walls with GreenGuard.

Our business is to help you build the most protected and durable walls possible. That’s why our residential line is filled with products that help block water and air infiltration and add insulating power. Installing continuous insulation on the wall exterior using our extruded polystyrene (XPS) sheathings and siding underlayments helps eliminate thermal breaks that result from using wood framing and sheathing. And our building wraps block air infiltration and serve as an essential component of water managed walls. When you use GreenGuard products, the result is better energy efficiency and durability for every home you build.

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