Kingspan Insulation
Kingspan Group

Q Series Fanfold Underlayment

Q Series Fanfold Underlayment header

When every penny counts, you can rely on the performance of our most economical fanfold siding 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. These products are also perforated to allow potentially harmful moisture vapor to escape so that it does not become trapped in the wall.

TYPICAL PHYSICAL PROPERTIES
Property Test Method Q250 Q350
Thermal Resistance, R-Value1
(oF-ft2-h/Btu)
ASTM C 518
(@ 75oF Mean Temperature)
0.9 1.1
Water Vapor Transmission Rate
(perm)
ASTM E 96
Desiccant Method
1.7 1.3
Water Absorption
(% by Volume)
ASTM C 272 2.0 2.0
Fire Characteristics2
Flame Spread
Smoke Developed
ASTM E 84/ UL 723
25
250

10
45-140
DIMENSIONS / PACKAGING
Q250 Q350
Width 48 in. 48 in.
Length 48 ft. 48 ft.
Square Feet / Pallet 9,000 9,000

1 Specimens were aged and tested in accordance with FTC Rule (16 CFR, Part 460) and ASTM C 578.

2 These numerical flame spread and smoke ratings are not intended to reflect hazards presented by this material under actual fire conditions.