Specification

PRODUCT DATA SHEET
FANFOLD
Foam Residing Board
Description
FANFOLD foam residing board is a thin perforated, extruded
polystyrene foam board faced on one side with a plastic film
facer and combines proven XPS foam technology with a
unique design to enhance the application of new or
replacement siding.
Features
• Closed –cell, rigid, lightweight foam board
• Smooth, even backing surface for fast and easy installation
• Large piece coverage and minimal joints installation reduces
drafts, increased thermal comfort and energy efficiency
• Perforated construction provides air infiltration and liquid water
resistance while permitting easy water vapor transmission
• Polystyrene core and plastic film skin provides a tough,
durable product
• Crush folded hinge at 24-inch intervals to ease handling
and application at the job site
Applications
FANFOLD foam residing board is generally intended for
application as a backer board for residing applications
where it provides a flat uniform surface for the application of
new siding products during remodeling for use in residential
and commercial exterior wall construction.
Installation Instructions
• FANFOLD foam residing board lightweight bundles
can be cut to fit with a common utility knife, thus saving
labor costs
• The faced side of the product shall be exposed to
exterior weathering
• The new siding material should be installed as soon as
possible after FANFOLD foam residing board installation
• FANFOLD foam residing boards should avoid prolonged
exposure to sunlight
Warnings and Precautions
Like many construction materials, FANFOLD foam residing
board is combustible. Do not expose the product to open
flame during shipping, storage, installation or use. This
product should be installed in accordance with applicable
building codes.
Physical Properties
Property Test Method
¼"
FANFOLD
3
⁄8"
FANFOLD
½"
FANFOLD
R-Value
1
(ft
2
•hr•F/Btu)
ASTM C 518
(Modified)
1.0 1.5 2.5
Water Absorption, % by
vol., max
ASTM C 272 2.0 2.0 2.0
Water Vapor
Permeance, perms, min
ASTM E 96
(Procedure A)
1.0 1.0 1.0
Compressive Strength,
psi, min
ASTM D 1621
(Modified)
8 8 31.5
Flame Spread
ASTM E 84/
UL 723
10 10 10
Smoke Development
ASTM E 84/
UL 723
165 200-350 450-500
Maximum Service
Temperature, °F
165 165 165
Product Availability
Thickness Size
Weight
(lbs)
Edges
Pallet
Bundle
Fanfold
Underlayment Board
¼" 4' x 50' 11 Square 48 Units
⅜" 4' x 50' 15 Square 33 Units
½" 4' x 24' 20 Square 48 Units