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P Series Fanfold Underlayment

When you need fundamental performance in an extruded polystyrene (XPS) siding underlayment, choose the P Series. Flexible plastic facers on both sides enhance durability, while an optional reflective facer enhances thermal performance. Both types of facers are perforated to allow moisture vapor to escape. A cut-and-fold hinge design ensures the underlayment lays flat.

Typical Physical Properties

Property

Test Method

P1450
FP1450
R-Value1
(°F-ft²-h/Btu)
ASTM C 518
(@75°F Mean Temperature) 
1.0
3.0
Water Vapor Permanence
(perm)
ASTM E 96
Procedure A
1.7
1.7
Water Absorption
(Max. % by Volume)
ASTM C 272
2.0
2.0
Compressive Strength
(psi @ 10% deflection)
ASTM D 1621
12
12
Fire Characteristics2
Flame Spread
Smoke Development		ASTM
E 84/UL 723
25
250
25
250


Dimensions / Packaging

P1450
FP1450
Length3
50'
50'
Width3
4'
4'
Nominal Thickness
1/4"
1/4"
Square Feet/Pallet
9,000
9,000


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 fanfolded 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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