Siding Underlayment

XPS Siding Underlayment

GreenGuard is the nation’s leading brand of siding fanfolds/underlayments. Made of extruded polystyrene (XPS), our underlayments provide superior moisture resistance and are perforated to allow moisture vapor to escape. They have high water resistance and are not a food source for mold. 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.

GreenGuard Siding Underlayment Products

GreenGuard XP14 / XFP14 Fanfold Underlayment

For the best fanfold siding underlayment available, choose the XP Series. The extruded polystyrene (XPS) foam offers superior stiffness, to help make your siding job have the smoothest finish possible.

GreenGuard XP38 / XFP38 Fanfold Underlayment

For the best fanfold siding underlayment available, choose the XP Series. The extruded polystyrene (XPS) foam offers superior stiffness, to help make your siding job have the smoothest finish possible.

GreenGuard Q250 / FQ250 Fanfold Underlayment

The Q-Series products have an extruded polystyrene foam (XPS) core with high-impact polystyrene capsheets on both sides, which make it one of the most durable products currently available.

GreenGuard Q350 / FQ350 Fanfold Underlayment

The Q-Series products have an extruded polystyrene foam (XPS) core with high-impact polystyrene capsheets on both sides, which make it one of the most durable products currently available.

GreenGuard XPS Residing Board

With its extruded polystyrene (XPS) construction, Kingspan GreenGuard XPS Residing Board has high water resistance and is not a food source for mold, and is not subject to moisture-related damage and deterioration.

GreenGuard P Series Fanfold Underlayment

Kingspan GreenGuard P1450 Siding Underlayment comprises 1⁄4” thick closed-cell polystyrene (XPS) with perforated capsheets on both sides.