Kingspan GreenGuard® PB4 Waterproofing Protection Board is a dense, closed cell extruded polystyrene (XPS) board designed to protect waterproofing membranes from damage during backfilling. It's tough plastic facers resist moisture absorption and decomposition — keeping your foundation waterproofing intact for the long term.
Product Highlights
- Protects Waterproofing Membranes — Shields applied membranes from backfill damage during foundation work.
- Dense Closed-Cell Construction — Resists moisture absorption and decomposition over time.
- Easy to Handle & Cut — No loose foam beads, clean cuts and easy site handling.
- Convenient Bundle Size — Comes in a 4 ft x 50 ft fanfold bundle for efficient coverage.
Product Specifications
| Property | Test Method | Result |
|---|---|---|
| General | ||
| Thickness (in) | 1/4 | |
| Nominal Bundle Dimensions (ft) | 4 x 50 fanfold | |
| Water Absorption, Max. (% by volume) | ASTM D2842 | 1.18 |
| Recommended Service Temp., Max. (°F) | 165 | |
| Weight (lb./1000 ft²) | 79 | |
| Thermal | ||
| Thermal Resistance, R-value (°F·ft²·hr/Btu) @ 75°F Mean Temp. | ASTM C518 | 1.0 |
| Fire & Smoke | ||
| Flame Spread | ASTM E84 / UL 723 | 40 |
| Smoke Development | ASTM E84 / UL 723 | 400 |
Documents & Resources
Frequently Asked Questions
How do I install XPS on my basement wall?
- Glue the board to the concrete wall using a minimum of 5 large sections of adhesive — 4 corners and one center. Apply pressure until the glue holds. Compatible adhesives are listed in TB11. Kingspan recommends Loctite Power Grab Adhesive.
- Alternatively, fasten the board with 5 Plasti-Grip PMF Anchors from TRUFAST.
- Apply common spray foam along the top and bottom edges to create an airtight seal.
- XPS must be covered by a code-approved thermal barrier such as drywall in occupied spaces.
What is the R-Value of Kingspan vacuum insulation panels?
Kingspan OPTIM-R vacuum insulation panels have a design R-value of R-28 — up to five times better than commonly used insulation materials at the same thickness.
Why choose vacuum insulation panels (VIPs) over standard insulation?
VIPs deliver the thinnest possible insulation solution without sacrificing performance — up to five times better than conventional materials. Ideal for retrofits, shallow walls, or any build where space is at a premium.
Where can phenolic insulation be used?
Kingspan phenolic insulation can be used in a wide range of ceiling and wall applications. See our technical brochures for full details.
What is the R-value of phenolic insulation?
Kingspan Kooltherm phenolic insulation achieves an R-value of up to R-7.4 per inch.