GreenGuard XP38_XFP38 Siding Underlayment

  GreenGuard XP Series
  Fanfold Underlayment

For the best fanfold siding underlayment available, choose the GreenGuard 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.

Product Information

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

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.

GreenGuard XP14 Siding Underlayment_Product Sheet_US_CA_IMG

GreenGuard XP14 Siding Underlayment Product Sheet

GreenGuard XP38 Siding Underlayment_Product Sheet_US_CA_IMG

GreenGuard XP38 Siding Underlayment Product Sheet

GreenGuard Fanfold Underlayment Standard Installation Guide

GreenGuard Fanfold Underlayment Standard Installation Guide

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GreenGuard XP-Series Siding Underlayment Technical Bulletin #17

GreenGuard XP-Series Siding Underlayment Technical Bulletin

GreenGuard Siding Underlayment, Sheathing & Roofing Cover Board Safety Data Sheet

GreenGuard Siding Underlayment, Sheathing & Roofing Cover Board Safety Data Sheet

GreenGuard XP Series Fanfold Underlayment Products

Do you need assistance selecting the right product?

Our teams are dedicated to helping make the process as easy as possible and ensure you get the right materials for your needs.

Contact Us

Kingspan Insulation North America

Head Office & Sales Office – North America

Kingspan Insulation LLC

2100 Riveredge Parkway, Suite 175

Atlanta, Georgia

USA

30328

Call: 1 800 241 4402

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