Dow THERMAX for Buildings - Manual (Page 2)

2. Install Clip Strip over long edge
of insulation board.
3. Offset board and fasten through
first layer, penetrating 1" into
framing members (i.e., girts or
purlins) with corrosion-resistant
fasteners and poly washers.
Each board should span at least
three framing members. The
maximum span is 5' for a 1"
thick board (Contact Dow
Customer Information Group for
additional thickness spannabili-
ty). Fasteners should be spaced
12" on center in three rows of
five fasteners per 48" board
width (Figure 2).
4. Slide next insulation board into
Clip Strip flange and fasten
through first layer into framing
members (Figure 3).
Note: In all of the installation
methods, it is important to seal
the wall-to-ceiling junction.
Dow offers a FROTH-PAK™
Foam Insulation product to help
provide this sealing option.
METHOD B
THERMAX™ Metal Building Board,
THERMAX™ Light Duty, THERMAX™
Heavy Duty, THERMAX™ Heavy Duty
Plus** or THERMAX™ White Finish
insulation with shiplap edge:
1. Apply a compatible construc-
tion-grade sealant to shiplap
edge, following sealant manu-
facturer instructions.
2. Offset insulation board and fas-
ten through first layer, penetrat-
ing 1" into framing members (i.e.,
girts or purlins) with corrosion-
resistant fasteners and poly
washers. Each board should
span at least three framing
members. The maximum span
is 5' for a 1" thick board
(Contact Dow Customer
Information Group for additional
thickness spannability).
Fasteners should be spaced 12"
on center in three rows of five
fasteners per 48" board width
(Figure 2).
3. Fit next board firmly into the
sealant-lined shiplap edge and
fasten.
4. Center THERMAX™ White
Foil Tape over dry, clean edge
joint and apply tape (Figure 1).
5. Use a squeegee or stiff bristle
brush to press the tape firmly to
the joint. Cut tape with a knife.
Do not tear tape.
METHOD C
THERMAX™ Metal Building Board,
THERMAX™ Light Duty, THERMAX™
Heavy Duty, THERMAX™ Heavy Duty
Plus** or THERMAX™ White Finish
insulation with square edge:
1. Offset insulation board a mini-
mum of 6" in both directions
and fasten through the first
layer, penetrating 1" into framing
members (i.e., girts or purlins)
with corrosion-resistant fasten-
ers and poly washers. Each
board should span at least three
framing members. The maxi-
mum span is 5' for a 1" thick
board (Contact Dow Customer
Information Group for additional
thickness spannability).
Fasteners should be spaced 12"
on center in three rows of five
fasteners per 48" board width
(Figure 2).
Note: If applied above the
purlin, lay THERMAX™ Sheathing
over the layer of insulation board
with a minimum offset of 6" in
both directions and fasten.
2. Center THERMAX™ White Foil
Tape over dry, clean edge joints
and apply tape (Figure 1).
3. Use a squeegee or stiff bristle
brush to press the tape firmly to
the joint. Cut tape with a knife.
Do not tear tape.
NOTICE: No freedom from infringement of any patent owned by Dow or others is to be inferred. Because use conditions and applicable laws may differ from one location to another and may change with time, Customer is
responsible for determining whether products and the information in this document are appropriate for Customer's use and for ensuring that Customer's workplace and disposal practices are in compliance with applicable
laws and other government enactments. The product shown in this literature may not be available for sale and/or available in all geographies where Dow is represented. The claims made may not have been approved for use
in all countries. Dow assumes no obligation or liability for the information in this document. References to “Dow” or the “Company” mean the Dow legal entity selling the products to Customer unless otherwise expressly
noted. NO WARRANTIES ARE GIVEN; ALL IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE ARE EXPRESSLY EXCLUDED.
CAUTION: This product is combustible and shall only be used as specified by the local building code with respect to flame spread classification and to the use of a suitable thermal barrier. For more information, consult
MSDS, call Dow at 1-866-583-BLUE (2583) or contact your local building inspector. In an emergency, call 1-989-636-4400.
FROTH-PAK™ Polyurethane Spray Foam contains isocyanate, hydrofluorocarbon blowing agent and polyol. Read the instructions and Material Safety Data Sheets carefully before use. Wear protective clothing (including
long sleeves), gloves, goggles or safety glasses, and proper respiratory protection. Supplied air or an approved air-purifying respirator equipped with an organic vapor sorbent and a P100 particulate filter may be required to
maintain exposure levels below ACGIH, OSHA, WEEL or other applicable limits. Provide adequate ventilation. Contents under pressure.
WARNING: Rigid foam insulation does not constitute a working walkable surface or qualify as a fall protection product.
Building and/or construction practices unrelated to building materials could greatly affect moisture and the potential for mold formation. No material supplier including Dow can give assurance that mold will not develop in
any specific system.
Printed in U.S.A. ®™Trademark of The Dow Chemical Company (“Dow”) or an affiliated company of Dow
**THERMAX™ Heavy Duty Plus Insulation is designed for use on walls only.
Form No. 179-04338X-0713MCK
MCKAY219243
I N S T A L L A T I O N I N F O R M A T I O N . C O M M E R C I A L . E N E R G Y - E F F I C I E N T S O L U T I O N S
www.dowbuildingsolutions.com Technical Information
1-866-583-BLUE (2583)
Sales Information
1-800-232-2436
IN THE U.S.
THE DOW CHEMICAL COMPANY
200 Larkin
Midland, MI 48674
Ask your Dow representative
about R-Detector Life Cycle
Energy Analysis Software.
Figure 3
BOARD THICKNESS, FASTENER
INCHES LENGTH, INCHES
1/2 to 5/8 1-7/16
3/4 to 1 1-7/8
1-1/8 to 1-1/2 2-3/8
1-5/8 to 2 3
2-1/4 3-1/4
2-1/2 3-1/2
3 4
Note: Fastener length based on one layer of THERMAX™
insulation. For the two-layer system, add board thickness
of second layer to fastener length recommendation.
TABLE 2: RECOMMENDED
FASTENER LENGTHS
Shiplap Edge
Note: Space fasteners 12" o.c. for wood, metal
or concrete attachment.
Figure 2: Fastening Pattern
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