Kingspan Insulation
Kingspan Group

PB4 Waterproofing Protection Board

PB4 Waterproofing Protection Board header

After the waterproofing membrane is applied to the foundation, protect it from damage during backfilling with PB4 Waterproofing Protection Board. This durable extruded polystyrene (XPS) board has the compressive strength and impact resistance to withstand even the toughest load pressures. Its dense, closed-cell construction and tough plastic capsheets resist both moisture absorption and decomposition from long-term exposure to chemicals in the soil.

Typical Physical Properties 
Property Test Method PB4
Thermal Resistance, R-Value1
(ºF-ft²-h/Btu)
ASTM C 518
(@ 75ºF Mean Temperature)
1.0
Thermal Conductivity
(Btu-in/hr-ft²-ºF)
ASTM C 518
(@ 75ºF Mean Temp., k)
.025
Water Vapor Permeance
(perm)
ASTM E 96
(Procedure A)
0.6
Water Absorption
(Max.% by Volume)
ASTM C 272 0.4
Compressive Strength
(psi @ 10% Deflection)
ASTM D 1621 16
Fire Characteristics2
Flame Spread
Smoke Developed
ASTM E 84/UL 723
25
250
Max Recommended
Use Temp. (ºF)
165
Weight
(lbs./1,000 sq.ft.)
80
DIMENSIONS / PACKAGING
Thickness (Nominal) 1/4"
Bundle Dimensions 4' x 50'
Square Feet/Bundle 200
Bundles/Pallet 45
Square Feet/Pallet 9,000

1 pecimens were aged and tested in accordance with FTC Rule (16 CFR, Part 460).

2 These numerical flame spread and smoke ratings are not intended to reflect hazards presented by this material under actual fire conditions (foam only). See UL Classification Certificate A184.