Thermax White Finish Insulation installation instructions

THERMAX

™

White Finish Insulation

Owners of agricultural buildings that house
animals, produce or equipment know that
controlling the indoor temperature and
humidity is a smart way to protect their
investment. Easy-to-install THERMAX

™

White

Finish Insulation offers thermal and moisture
protection that can be used as an exposed
interior finish and insulation on walls and
roofs. THERMAX

™

White Finish boards

consist of a core of glass fiber-reinforced
polyisocyanurate foam. The front has a
durable nominal 1.25 mil embossed white
acryliccoated aluminum facer that can be
pressure-washed, while the back side is faced
with 1.25 mil smooth aluminum.

There are three methods that can be used to
install THERMAX

™

White Finish Insulation.

Each system is outlined here.

GENERAL INFORMATION

• THERMAX

™

White Finish Insulation must be

kept dry at all times. Protect it from moisture
both in storage and during installation.

• With its tough, embossed white acrylic-

coated surface, THERMAX

™

White Finish

Insulation can be pressurewashed at 800
psi (3’ distance) using 15 degree spray tip.

• Install THERMAX

™

White Finish Insulation

with the white acryliccoated side exposed.

• THERMAX

™

White Finish board joints

must be sealed with THERMAX

™

White

Foil Tape. Before applying tape, wipe the
application area with a damp cloth to
remove foam dust. Allow surface to air dry.

• Use a squeegee or soft paint roller

to press the tape firmly to the joint.
Cut tape with a knife or scissors. Do
not tear tape. Taping serves as a
protection against moisture penetration
and gives the exterior of the boards a

continuous surface.

• End-joint gaps greater than 1/8” should

be filled with spray foam such as GREAT
STUFF PRO

™

Gaps & Cracks Insulating

Foam Sealant or equivalent to keep a
continuous air infiltration barrier and to
help ensure maximum thermal efficiency
across the board joints. To increase the
moisture effectiveness of the board joints,
apply THERMAX

™

White Foil Tape over the

sprayed board joints.

• There are two ways to cut THERMAX

™

White Finish Insulation boards. One way

is to use a straight edge and a utility knife,
making sure to cut all the way through
the facing. Or, THERMAX

™

White Finish

boards may be cut with a small handsaw.

SECUREMENT

Install a minimum 1” THERMAX

™

White

Finish Insulation board perpendicular to
framing, spanning at least three framing
members. Penetrate separate wood and
metal framing 1” with a corrosionresistant
fastener and poly washer, such as QUIK Cap.

When fastening to metal, Buildex Multi-

Diameter Insulation Teks or equivalent (with
minimum 1-1/4” poly washers) are advised.

INSTALLATION
Good System

Leave square edge joints untreated. Tape the
back side of the joint with THERMAX

™

White

Foil Tape (Figure 1).

FIGURE 1

Materials Checklist

• Utility knife or small handsaw
• Straight edge
• Measuring tape
• Pencil
• Construction-grade sealant
• THERMAX

™

White Foil Tape

• Squeegee or soft paint roller
• Hammer, pneumatic fastener or

screwdriver

• PVC Clip Strips
• Fasteners and poly washers

(such as QUIK Cap Washer-Plastic

Round or Buildex Multi-Diameter

Insulation Teks)

• Polyisocyanurate-compatible

polyurethane spray sealant, such as

GREAT STUFF PRO

™

Gaps & Cracks

Insulating Foam Sealant*

• Safety glasses

I N S TA L L G U I d E | United States | R E S I d E N T I A L

How do you cut Thermax insulation?

There are two ways to cut Thermax™ Sheathing. One way is to use a straight edge and a utility knife, making sure to cut all the way through the facing. Make sure the surface backing is safe to cut on. Or, Thermax™ Sheathing may be cut with a small handsaw.