PO Box 5997
401 Bellevue Rd,
Newark, DE 19713
V 302-455-9733
F 302-454-9021
www.ptmmanufacturing.com
[email protected]
ISO 9000 compliant
1 of 17
Raw Material
PO Box 5997
401 Bellevue Rd,
Newark, DE 19713
V 302-455-9733
F 302-454-9021
Manufactured from 4×8-foot sheets
Fiber-reinforced 1-mil aluminumfaced polyisocyanurate panels
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0.032 embossed aluminum
ISO 9000 compliant
Other patterns and stainless
steel are available
Necessary supplies are
included with every job
2 of 17
Shop Fabrication
Fabricating in the workshop promotes safety and better QC than trying to make the parts in the field. Panels are dry fit
before final assembly to ensure correct alignment and fit.
PO Box 5997
401 Bellevue Rd,
Newark, DE 19713
V 302-455-9733
F 302-454-9021
www.ptmmanufacturing.com
[email protected]
ISO 9000 compliant
3 of 17
Shapes of the Pieces
Top
Sides
Bottom
PO Box 5997
401 Bellevue Rd,
Newark, DE 19713
V 302-455-9733
F 302-454-9021
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Assembled
The pieces fit together in shiplap joints. The joints don’t
leak, come apart, or weaken the system.
ISO 9000 compliant
4 of 17
Fitting to the Ductwork
PO Box 5997
401 Bellevue Rd,
Newark, DE 19713
V 302-455-9733
F 302-454-9021
www.ptmmanufacturing.com
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To ensure accuracy,
detailed measurements are
taken directly from the
existing ductwork.
Techna-Duc
Ductwork
ISO 9000 compliant
Techna-Duc is fabricated to be ½ inch larger all
around than the ductwork it protects, adding a
significant improvement to system efficiency
Typical ½" Air Space
5 of 17
Sealed Interlocks
Aluminum cladding
protects the insulation,
assures a strong, tight fit
for the panels, and
prevents water infiltration
PO Box 5997
401 Bellevue Rd,
Newark, DE 19713
V 302-455-9733
F 302-454-9021
www.ptmmanufacturing.com
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ISO 9000 compliant
Bottom and side protection
6 of 17
TDC Joints
In the field, installers measure the location of the joint, cut out the notch in the Techna-Duc, then seal the exposed
surfaces, creating a weather-tight groove that completely covers the TDC joint and still provides insulation.
PO Box 5997
401 Bellevue Rd,
Newark, DE 19713
V 302-455-9733
F 302-454-9021
www.ptmmanufacturing.com
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The groove is created in the field
to exactly match any joint location, even at a joint
ISO 9000 compliant
7 of 17
Ponding Prevention
On large ducts, a slight arch created by a strip of insulation keeps water from ponding on the duct
without causing a leak-prone seam along the top.
PO Box 5997
401 Bellevue Rd,
Newark, DE 19713
V 302-455-9733
F 302-454-9021
www.ptmmanufacturing.com
[email protected]
ISO 9000 compliant
8 of 17
Triple Seal System
Sealant on the shiplap
Butyl tape over the butt joints
Caulk around the bands
PO Box 5997
401 Bellevue Rd,
Newark, DE 19713
V 302-455-9733
F 302-454-9021
www.ptmmanufacturing.com
[email protected]
Stainless steel weather-seal screws
Sealant and butyl stay flexible and
sticky; caulk remains flexible with a
tough, dry finish. The aluminum band
is a fourth level of protection.
ISO 9000 compliant
9 of 17
Access Doors
PO Box 5997
401 Bellevue Rd,
Newark, DE 19713
V 302-455-9733
F 302-454-9021
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Access doors for any purpose can be
installed on any flat surface in the system
ISO 9000 compliant
10 of 17
Inspection Plugs, Flashing
PO Box 5997
401 Bellevue Rd,
Newark, DE 19713
V 302-455-9733
F 302-454-9021
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Connections to walls and
units are sealed with
expanding foam, butyl tape,
flashing, and UL 181 silicone.
They are included in the 20year warranty.
ISO 9000 compliant
Inspection plugs allow access to the interior without
compromising the Techna-Duc seal
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Support on the roof
PO Box 5997
401 Bellevue Rd,
Newark, DE 19713
V 302-455-9733
F 302-454-9021
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Standard
Extra wind protection
ISO 9000 compliant
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Maximizing Cost Effectiveness
Keeping duct walls below the 39-inch threshold reduces cost by simplifying fabrication
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Example 2
Example 1
PO Box 5997
401 Bellevue Rd,
Newark, DE 19713
V 302-455-9733
F 302-454-9021
ISO 9000 compliant
Prices are for comparison only, and do not include installation, delivery, or other variables
Example 1
$9.82
minus Example 2
$7.27
Analysis
equals square foot savings
$2.55
or % savings
26%
13 of 17
Analysis
Annualized cost/sf
Energy Analysis
Units
Techna-Duc
$30
Bare Sheet
Metal
Inches
2
0
2
Installed Insulation Thickness
Inches
2
0
1.125
Installed R-value
US
R-16
0
R-3.9
Installed R-value wet
US
R-16
0
0.05
Cooling Loss
BTU × ft2 ×1 hr
55,251
1,782,876
828,767
Total Cooling Loss
BTU × ft2 ×1 hr
55,251
1,782,876
828,767
MBTU ×1 year
Cost of total BTU loss
$8 × MBTU
% loss compared to TechnaDuc
%
242
7809
3630
$1936
$62,472
$29,040
3127%
1400%
CASE STUDY
Project:
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Sheet Metal w/ R-4.2
FG wrap, wet
Insulation Thickness
Annual Cooling Loss
PO Box 5997
401 Bellevue Rd,
Newark, DE 19713
V 302-455-9733
F 302-454-9021
$25
$20
$15
$10
Insulate 35000 square feet of roof top HVAC duct work
Spec. Comparison: 2" Thick Iso Board covered with EPDM vs. Techna-Duc Panel System
$5
Labor Cost:
$
EPDM and Iso Board: $
Total Square Feet:
Material Cost:
$
182,000
Labor Cost:
Material Cost
TECHNA-DUC:
5.25 sf
35000
Total Square Feet:
183,750
$
$
62,920
10.00 sf
35000
Material Cost:
$
350,000
Total Job Cost
Labor Cost:
Material Cost:
$
$
182,000
183,750
Labor Cost:
Material Cost:
$
$
62,920
350,000
Project Cost:
$
365,750
Project Cost:
$
412,920
Installed Cost/SF:
$
10.45
Installed Cost/SF:
$
11.80
Fiberglass and Mastic
Year 20
Year 16
Year 12
$Year 8
35000
288
121
968
65
Year 4
Total Square Feet:
Productivity SF/Day:
Man Days Required:
Manhours (Days x 8):
Cost per Manhour:
$
TECHNA-DUC
Installation Labor
35000
Total Square Feet:
100
Productivity SF/Day:
350
Man Days Required:
2800
Manhours (Days x 8):
65
Cost per Manhour:
$
Installed Cost
per SF
2" Iso Board and EPDM
TECHNA-DUC
ISO 9000 compliant
Cost does not include energy savings, nor
maintenance, which is zero for Techna-Duc,
but can be considerable for fiberglass/mastic
depending on the maintenance and
replacement schedule
14 of 17
Performance Specification
Part 1—GENERAL
Scope
This specification covers material, fabrication, and installation of an
interlocking four-piece insulation panel system for exterior
rectangular ductwork.
Purpose
A. Standardize material and design requirements.
B.
Provide alternate insulation system.
Part 2—PRODUCTS
Insulation
A. Material. Insulation material applied shall be a glass reinforced
polyisocyanurate foam insulation encased in 1.25 mil aluminum foil
facers.
B.
Thickness. Insulation material shall be ½" thicker than required to
cover duct supports and connection flanges. As a minimum, the
overall insulation system shall be 1½" thick.
C.
Note: Polyisocyanurate of this required thickness does not meet the
25/20 fire code standards and should not be used for interior
applications without proper approval from site fire safety personnel.
Weather Barrier
A. Weather barrier shall be fabricated of embossed aluminum
sheeting, 0.032" in thickness.
Vapor Barrier
A. For purposes of sealing longitudinal and circumferential joints from
vapor migration, a non-setting vapor barrier bedding compound
joint sealant shall be utilized.
Caulking Compound
A. At weather barrier abutment locations, an industrial grade RTV
caulk shall be utilized, where applicable.
Putty
A. Seams in weather barrier shall be covered and sealed with a ¾"wide
by 1/8" thick butyl compound putty.
Part 3—FABRICATION
Sizing
A.
Panel system shall be sized to provide a top and side
panel overlap equal to the thickness of the insulation
being applied.
Part 5—INSTALLATION
Shop Fabrication
A. Where feasible all general fabrication shall be performed in
the shop and be based off of issued project drawing or direct
field measurements.
Lamination
A.
Insulation shall be laminated to the weather barrier
and sized to allow for sufficient overlap as indicated in
section 2.1 above. Insulation shall be adhered utilizing
appropriate contact cement.
Field Fabrication
A. Field fabrication should be limited to routing and sealing of
the insulation panels to allow for duct angle, supports, gauges
or other duct related necessities.
Insulation Joints
A.
Each panel will be constructed so that all vertical and
horizontal insulation seams will have an interlocking
and overlapping shiplap style joint to provide a
thermal seal and allow for no direct heat transmission.
The overlap shall be a minimum of ½" thick material.
B.
Part 4—STORAGE
On Site
A.
Materials shall be stored on site in a dry environment.
Only dry insulation materials shall be installed.
B.
Material shall be stored in such a way as to prevent
breakage of or damage to the insulation panel system.
C.
In stored inside, materials shall be stored in an area
fitted with sprinklers or other location approved by site
safety personnel.
PO Box 5997
401 Bellevue Rd,
Newark, DE 19713
V 302-455-9733
F 302-454-9021
www.ptmmanufacturing.com
[email protected]
All routed areas shall be resealed with appropriate foil faced
cast tape. No insulation material shall be exposed to the
environment.
Installation
A. Interlocking panel system shall be fitted into place on the
rectangular ductwork. Prior to fitting, a minimum of a 3/8"
bead of joint sealant shall be applied at each joint to serve as a
vapor barrier.
B.
Material shall be fitted so that the vapor barrier seal is
continuous and does not allow for water vapor infiltration.
C.
Once fitted, the panel system shall be fastened together with
#10 self-tapping, stainless steel, and vapor seal screws on a
maximum of 12" on center. For duct wider than 48", a bottom
fastener should be utilized.
Weather Proofing
A. At all circumferential joints, a ¾" wide by 1/8" thick butyl
compound putty shall be rolled onto the joint using a laminate
roller sized to overlap the tape.
B.
The butyl compound shall be covered with a 3" wide aluminum
cap fabricated from the same metal as the jacketing material.
All seams of the aluminum cap shall be sealed with a 3/8" bead
of RTV caulk, colored to match the panel system.
ISO 9000 compliant
All Specifications and material are subject to change without notice
as new and better products are used.
Screws
A. Screws utilized to fasten panel system together shall be #10½" selftapping, stainless steel, weather seal washer screws.
Contact Cement
A. Contact cement shall be utilized for laminating insulation material
to the
Tape
A. Cast tape used for sealing insulation edges shall be a minimum
thickness of 1.25 mil. weather barrier sheeting.
15 of 17
Submittal Sheet
Description
Techna-Duc® is a pre-manufactured panel
system for insulating exterior ductwork. It is
manufactured as four-piece interlocking
panels whose exact configuration varies to
match the shape of the ductwork. The
interlocking panels are fabricated from
polyisocyanurate insulation, laminated in two
Layers, which provide an installed R-16. The
insulation is jacketed with .032" embossed
aluminum and sealed with vapor barrier
compound. All joints interlock to insure an airtight seal. Panels are secured with #10 selftapping stainless screws with weather-seal
washers.
Recommended Uses
Techna-Duc® is for use on exterior rectangular
ductwork. The interlocking panels provide a
weather-tight seal and preserve thermal
insulation value.
Advantages
Techna-Duc® is a shop-fabricated panel system
built from drawings or field measurements
and installed with minimum field alterations.
The interlocking panels are made from
polyisocyanurate insulation, which does not
promote the growth of mold or mildew. The
panels are laminated for ease of installation
over TDC joints. The interlocking panels
prevent air penetration, intrusion of water,
and water vapor.
Quick Spec
Techna-Duc® panels are numbered per shop
drawings for ease of installation. The panels
are rigid enough to avoid sagging and
withstand weathering. These unique features
enable us to provide a 20-year limited
warranty.
Warranty
Techna-Duc® is backed by a limited 20-year
warranty. No other duct insulation system
offers the consumer this level of confidence.
Insulation Physical properties
Foil-Faced
Board
Density, pcf
(kg/m3)
H2O Vapor
transmission
permeance, in
perms
Water absorption
ASTM
D-1622
Result
E-96
Nominal
2 pcf (32)
< 0.03
C-209 (24 hrs)
< 0.3%
Flexural strength in
psi (kPa)
Operating temp
range F (C)
C-203
> 40 psi (276)
2"-thick system R
C-236/C-518
R-16
½"-thick system R
C-236/C-518
R-6.1
-100° – +250° (73° – 121°)
System R-value is the sum of the stabilized R-value plus
additional R-value calculated when the aluminum foil
surface is installed next to a non-ventilated 3/4" air
space (R-value = 2.8). All values from the ASHRAE
Fundamentals Hbk.
Outdoor Rectangular Duct Installation
1. Pre-manufactured panel system consisting of
four-piece interlocking sets.
PO Box 5997
401 Bellevue Rd,
Newark, DE 19713
V 302-455-9733
F 302-454-9021
www.ptmmanufacturing.com
[email protected]
2. The interlocking panels shall be constructed of
Dow Thermax polyisocyanurate insulation,
ASTM D-1622, nominal 2 pcf; water vapor
transmission as permeance less than 0.03, per
ASTM E-96; water absorption less than 0.3% (24
Hours), per ASTM C-209; flexural strength more
than 40 psi, per ASTM C-203.
3. Operating temperature range of -100o F to +250o
F.
4. Insulation shall be laminated in two layers to
provide an installed system value of R-16 at 2"
thickness, per ASTM C-236/C-518.
5. The insulation shall be clad with 0.032"-thick
embossed aluminum and sealed with vapor
barrier compound. All joints shall interlock to
ensure a thermal seal with no pass-through
seams.
ISO 9000 compliant
6. Panels shall be secured with #10 self-tapping
stainless steel screws with weather-seal washers.
7. Manufacturers: Techna-Duc Insulation System
as made by PTM Manufacturing, LLC, Newark,
Delaware.
16 of 17
Related Products
PO Box 5997
401 Bellevue Rd,
Newark, DE 19713
V 302-455-9733
F 302-454-9021
www.ptmmanufacturing.com
[email protected]
ISO 9000 compliant
17 of 17