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GreenGuard Siding Insulation

GreenGuard is the nation’s leading brand of siding underlayments. Made of extruded polystyrene (XPS), our underlayments provide superior moisture resistance and are perforated to allow moisture vapor to escape. They do not absorb water, are not a food source for mold, and are not subject to moisture-related damage and deterioration. They also retain their insulating properties over time. All of our underlayments are designed to lay flat, giving siding a smooth, even finish. Plus they are lightweight and durable, so they cut easily without crumbling.

XP14 and XP38 Fanfold Insulation

For use in Replacement Siding Operations to Provide a Level Surface Over Old Siding, Add Insulation and Weather Protection

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 Value
Kingspan
GreenGuard
XP14 Siding
Underlayment
Kingspan
GreenGuard
XP38 Siding
Underlayment
Nominal Thickness (in) 1/4 3/8
Nominal Width (ft) 4 4
Nominal Length (ft) 50 50
Water Absorption
(Max. % by Volume)
ASTM C 272 2.0 2.0
Water Vapor
Permeance (perm)
ASTM E 96
(Desiccant Method)
1.7 1.7
Thermal
Thermal Resistance, R-Value1
(ºF-ft²-h/Btu per in thick)
ASTM C 518
(@ 75ºF Mean
Temperature)
1.0 1.5
Fire & Smoke
Flame Spread2
Smoke Developed2
ASTM E 84/UL 723 25
250
25
250
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