\* \* \* \* \* \* \* \* \* \*

READ AND **REMOVE THIS PAGE** BEFORE PLACING

THE SPECIFICATION SECTION IN THE CONTRACT

\* \* \* \* \* \* \* \* \* \*

[DIVISION 15: MECHANICAL]{.underline}

SECTION 15290 ‑ DUCTWORK INSULATION

USE: Furnishing and installing ductwork insulation.

**NOTES TO SPECIFIER:**

A. Options within paragraphs are identified by enclosure in brackets;
blank spaces enclosed by brackets \[\_\_\_\_\_\] provide for information
to be inserted, as appropriate, to individual projects.

B. **TO AVOID CONFLICTING REQUIREMENTS AND COSTLY MISTAKES,** the
specifier must edit (delete, substitute or add to the text). The
remaining paragraphs must be renumbered.

C. DELETE FOR FINAL COPY: Notes to the Specifier, located between lines
of asterisks; all \[brackets\], [underlining]{.underline}, **boldface**,
and *italics*, within the paragraphs; and this page. (Open Reveal Codes
\[alt F3\] to do this accurately.)

D. [To Edit "(Footer B)":]{.underline} (Corel 8). **ENTIRE FOOTER SHOULD
BE BOLDED.** Click in the footer and delete the "Project Name (ftr B)"
text and replace it with the **Name of the Project (upper and lower
case)**. Replace date with current MM/YY (WITHOUT BRACKETS).

E. The Guide Specifications are intended to be continuously reviewed and
revised. User's technical comments are appreciated. Also, other related
or similar specification that are written "from scratch" that could
benefit others, or other questions can be sent to NSTC A/E Group, ST
110, or call (303) 987-6868.

**DRAWING DATA REQUIRED:**

**REQUIRED SPEC MODIFICATIONS:**

[GENERAL NOTES]{.underline}

A. Whenever entire articles, paragraphs or subparagraphs are not
applicable, the articles, paragraphs or subparagraphs should be deleted;
when necessary, reletter or renumber articles, paragraphs or
subparagraphs.

B. THIS GUIDE IS NOT INTENDED AS A SUBSTITUTE FOR READING THE ENTIRE
SECTION.

[TECHNICAL NOTES]{.underline}

A. 1.1A: Select applicable words.

B. 1.1B: Select or add applicable specification sections. Do not list
specification sections from Division 15.

C. 1.2: Select or add applicable references.

D. 1.3A: Select applicable specification section.

E. 1.3B: Insert number of copies of the manufacturer\'s description data
required. Normally 5 copies are required. Distribution after review is
normally 1 copy to the COR, 3 copies to the Contractor, and 1 copy to
the project file.

F. 1.3C: Insert number of copies of the manufacturer\'s installation
instructions required. Normally 5 copies are required. Distribution
after review is normally 1 copy to the COR, 3 copies to the Contractor,
and 1 copy to the project file.

G. 1.3D: Insert number of copies of the manufacturer\'s maintenance
instructions required. Normally 5 copies are required. Distribution
after review is normally 1 copy to the COR, 3 copies to the Contractor,
and 1 copy to the project file.

H. 1.3E: Insert number of copies of shop drawings required. Normally 5
copies are required. Distribution after review is normally 1 copy to the
COR, 3 copies to the Contractor, and 1 copy to the project file.

I. 1.3F: Insert number of copies of Certificates of Conformance
required. Normally 3 copies are required. Distribution after review is
normally 1 copy to the COR, 1 copy to the Contractor, and 1 copy to the
project file.

J. 2.1A: Select applicable reference.

K. 2.2A2: Select applicable words.

L. 2.2A3: Select applicable words.

M. 3.2B: Select applicable phrases.

N. 3.2B2: Insert correct specification page number.

O. 3.2D: Select applicable specification section.

P. 3.4A: Select or add applicable insulation thickness.

Q. 4.1 and 4.2: When a \"lump sum\" Contract is used, delete the title
PART 4: MEASUREMENT AND PAYMENT, and both articles from this section.
Measurement and payment will be addressed in Part 4 of Section 01010
-Summary of Work.

**REVISIONS OF THIS SECTION:**

CSI format, editorial changes: 12/01

Metric:

Technical Update: 12/90

SECTION 15290

DUCTWORK INSULATION

[PART 1: GENERAL]{.underline}

1.1 SUMMARY:

A. Section Includes: \[Furnishing\] \[and\] \[Installing\] \[thermal\]
\[and\] \[acoustical\] insulation for ductwork.

1.2 REFERENCES:

A. Adhesive and Sealant Council:

ASC A‑7001A‑1971 Adhesive for Duct Liners

B. American Society for Testing and Materials:

ASTM C 423‑89 Test Method for Sound Absorption and Sound Absorption
Coefficients by the Reverberation Room Method

ASTM C 553‑70 Mineral Fiber Blanket and Felt Insulation

ASTM C 612‑83 Mineral Fiber Block and Board Thermal Insulation
(Industrial Type) (R 1977)

ASTM C 916‑85 Adhesives for Duct Thermal Insulation

ASTM E 84‑REV A-89 Test Methods for Surface Burning Characteristics of
Building Material

ASTM E 795‑83 Practices for Mounting Test Specimens During Sound
Absorption Tests

C. Federal Specifications:

Fed. Spec. HH‑B‑100B Barrier Material Vapor (For Pipe, Duct, and
Equipment Thermal, Insulation)

Fed. Spec. HH‑I‑545B Insulation, Thermal and Acoustical (Mineral Fiber,
Duct Lining Material)

Fed. Spec. L‑T‑80B Tape, Pressure Sensitive Adhesive (Aluminum Backed)

D. Military Specifications:

Mil. Spec. C‑19565C Coating Compounds, Thermal Insulation, Fire and
Water‑Resistant, Vapor Barrier

E. National Fire Protection Association:

NFPA 90A‑89 Installation of Air Conditioning and Ventilating Systems

NFPA 255‑84 Standard Method of Test of Surface Burning Characteristics
of Building Materials

F. ab Sheet Metal and Air Conditioning Contractors\' National
Association, Inc.:

SMACNA 1985 HVAC Duct Construction Standards ‑ Metal and Flexible

G. Underwriter\'s Laboratories, Inc.:

UL 181‑81 Factory-Made Air Ducts and Connectors

1.3 SUBMITTALS:

A. General: Submittals shall be according to \[Section 01300 ‑
Submittals.\] \[and\] \[Section 01365 - Certificates of Conformance.\]

B. Manufacturer\'s Literature: Submit \[[ ]{.underline}\] copies of the
manufacturer\'s descriptive data for the \[thermal\] \[and\]
\[acoustical\] insulation to be used on this project.

C. Installation Instructions: Submit \[[ ]{.underline}\] copies of the
manufacturer\'s installation instructions for \[thermal\] \[and\]
\[acoustical\] insulation to be used on this project.

D. Maintenance Instructions: Submit \[[ ]{.underline}\] copies of the
manufacturer\'s maintenance instructions for the \[thermal\] \[and\]
\[acoustical\] insulation to be used on this project.

E. Shop Drawings: Submit \[[ ]{.underline}\] copies of shop drawings for
the ductwork insulation to be used on this project. Shop drawings shall
indicate the thickness of the material to be used on this project. \[A
bill of materials shall be furnished with the shop drawings.\] \[Include
a schedule showing the location of \[[ ]{.underline}.\] Drawings shall
be \[same\] \[larger\] scale as the full size Contract Drawings.

F. Certificates of Conformance: Submit \[\_\_\_\_\] copies of written
certification from the supplier of the Contractor-furnished ductwork
insulation to be used on this project that it conforms to the
requirements of this specification section.

1.4 QUALITY ASSURANCE:

A. Labeling Requirements: Every package or standard container of
insulation, jackets, cements, adhesives, and coatings shall have the
manufacturer\'s stamp or label attached giving name of manufacturer,
brand, and description of material. Insulation packages and containers
shall be marked \"asbestos‑free.\"

1.5 PROJECT/SITE CONDITIONS:

A. Temperatures: Perform work at ambient and equivalent temperatures as
recommended by the adhesive manufacturer.

[PART 2: PRODUCTS]{.underline}

2.1 GENERAL:

A. Fire Resistance: Insulation, adhesive, vapor‑barrier materials, and
other accessories, except as specified herein, shall be noncombustible.
The materials shall not have a flame‑spread rating more than 25 and a
smoke‑developed rating not more than 50 according to \[NFPA 255\] \[ASTM
E 84\].

1\. Material Tests: Underwriters\' Laboratories, Inc. (UL) label or
satisfactory certified test report from an approved testing laboratory
will be required to indicate that fire hazard ratings for materials
proposed for use do not exceed those specified. Flame‑proofing
treatments subject to deterioration due to effects of moisture or high
humidity are not acceptable.

2.2 MATERIALS:

A. Duct Insulation:

1\. General: Temperature ranges and densities shall be as specified.
Insulation shall be \"asbestos‑free.\"

2\. Flexible Mineral‑Fiber Blanket: Shall meet the requirements of
\[ASTM C 553, Type I (flexible resilient), Class B‑5 (up to 400 degrees
F), 2.0 pcf nominal\].

3\. Rigid Mineral‑Fiber: Shall meet the requirements of \[ASTM C 612,
block and board type, \[Class 2 (up to 400 degrees F), 12 pcf (avg.)
max.\] \[Class 4 (up to 1000 degrees F), 12 pcf (avg.) max.\] \[or\]
\[Class 5 (up to 1800 degrees F), 20 pcf (avg.) max.\].

4\. Duct Liner: Shall meet the requirements of Fed. Spec. HH‑I‑545, Type
II up to 250 degrees F and 6000 ft/min.

5\. Acoustical Duct Lining:

a\. Air friction correction factor shall not exceed 1.1 at 1,200 ft/min.

b\. Shall be specifically manufactured for the application, and shall
conform to the requirements of Fed. Spec. HH‑I‑545, Type I.
Manufacturer\'s rated velocity (UL Standard 181, Erosion Test) shall be
at least 4,000 ft/min.

c\. Linings exposed to average duct velocities of 2,000 ft/min and less
shall have an average density of 1‑1/2 pcf and a minimum thickness of
one inch. Linings shall be installed according to SMACNA \"HVAC Duct
Construction Standards ‑ Metal and Flexible.\"

d\. Linings exposed to average duct velocities above 2,000 ft/min shall
have a minimum compressed density of 3 pcf and a minimum thickness of
one inch and shall be installed according to SMACNA \"HVAC Duct
Construction Standards ‑ Metal and Flexible.\"

B. Adhesives, Sealants, and Compounds:

1\. General: Shall be compatible with materials to which applied and
suitable for the service.

2\. Vapor Barrier and Jacket Adhesive: Shall meet the requirements of
ASTM C 916.

3\. Lagging Adhesive: Shall meet the requirements of ASTM C 916.

4\. Vapor Barrier Coating: Shall meet the requirements of Mil. Spec.
C‑19565, Type II (indoor only above 60 degrees F).

5\. Duct Liner Adhesive: Shall meet the requirements of ASC A‑7001A.

C. Accessories:

1\. Fasteners: Shall be anchor pins or mechanical fasteners recommended
by the insulation manufacturer.

2\. Aluminum‑Foil‑Backed Pressure‑Sensitive Adhesive Tape: Shall meet
the requirements of Fed. Spec. L‑T‑80, 50 degrees F max. and limited to
use on insulation with factory‑applied jacket with aluminum foil facing.

3\. Steel Parts: Shall be zinc coated or cadmium plated.

2.3 FABRICATION:

A. General: Where duct lining is indicated on the drawings, metal
ductwork shall be increased in each dimension to accommodate the
thickness of the material. Finished dimension inside lining shall be the
same as those shown on the drawing.

B. Sound Absorption Coefficients: Shall be tested according to ASTM C
423 and ASTM E 795 mounting with 24 gauge sheet metal backing and based
on 1‑1/2 pcf density as follows:

THICKNESS FREQUENCY

1 inch 0.23 0.54 0.68 0.84 0.92 0.89

2 inches 0.44 0.77 0.96 0.99 0.99 0.99

[PART 3: EXECUTION]{.underline}

3.01 PREPARATION:

A. Surface Preparation: Do not apply insulation until surfaces to be
covered have been leak tested, have had rust and scale removed, and have
been cleaned, dried, and inspected.

3.2 APPLICATION:

A. General: Insulation shall be clean and dry when installed and kept
dry during finish application. Install materials neatly with smooth and
even surfaces with jackets drawn tight and smoothly cemented down on
longitudinal and end laps. Scrap pieces shall not be used where a
full‑length section will fit. Surface finishes shall be extended to
protect all surfaces, ends, and raw edges of insulation. Coatings and
adhesives shall be applied at the manufacturer\'s recommended coverage
per gallon.

B. Ducts, Plenums, and Casings: Insulate heating, ventilating, and air
conditioning, supply and return, from the outside air intake to the room
outlets. Insulate flexible runouts, plenums, casings, and air handlers.
\[Insulate concealed evaporative cooling ductwork to the outlets.\]
\[Install rigid insulation on exposed ducts in inside and outside
locations.\] Where indicated, provide rigid insulation lining inside
ducts. Use flexible blanket insulation on concealed interior ducts and
on exposed round or oval ducts. Insulation shall be continuous through
walls and floors except at fire dampers.

1\. When insulation is Not Required: Do not insulate fibrous glass ducts
with heat transmission coefficients (\"U\") not over 0.25 BTU/sq ft/hr
per degree at 70 degrees F mean temperature, unless otherwise indicated.
Do not insulate factory‑insulated ducts, plenums, casings, fibrous glass
ducts, and mixing and filter boxes.

2\. Acoustically Lined Ducts: Provide additional external insulation on
ducts with acoustical lining when lining thickness is less than that
required in Table 1 (page \[[8]{.underline}\]) for the duct operating
temperature.

3\. Access Plates and Doors: On internally insulated ducts, plenums, and
casings, continue insulation on access plates and doors. On externally
insulated ducts, plenums, and casings, provide insulation‑filled hollow
steel panels and doors for access openings larger than 4 sq ft; where
high operating temperatures present a hazard to personnel; or where
moisture condensation on low temperature systems is a problem. Bevel
insulation around access plates and doors.

4\. Rigid Insulation: Secure rigid insulation by impaling over pins or
anchors located not more than 3 inches from edge of boards and spaced
not more than 18‑inch centers and secured with washers and clips.
Spot‑weld anchor pins or attach with a waterproof adhesive especially
designed for use on metal surfaces. Apply insulation with joints lightly
butted. Where vapor barrier is specified, joints, breaks, punctures, and
voids shall be filled with vapor barrier coating compound and covered
with vapor seal material identical to that surrounding. Neatly bevel
insulation around nameplates and access plates and doors. Each pin or
anchor shall be capable of supporting a 20‑pound load. Protruding ends
of clips shall be cut off flush after clips are secured and sealed with
aluminum‑backed pressure sensitive tape and coated with silicone
adhesive.

5\. Flexible Blanket Insulation: Apply tightly and smoothly to duct.
Seal joints of insulation with 4‑inch wide waterproof bonding adhesive
tape. In addition to adhesive tape, secure flexible insulation on the
bottom of rectangular, horizontal, and sloping ducts with wire or
outward clinch staples.

6\. Insulation Thickness: Except where indicated or specified otherwise,
use 2‑inch thick rigid or flexible blanket insulation on ducts, plenums,
and casings with operating temperatures 200 degrees F or less.

C. Insulation Vapor Barrier Covering: Shall meet the requirements of
Fed. Spec. HH‑B‑100, Type I vapor barrier covering for ducts. Vapor
barrier surfaces shall be suitable for painting.

1\. Exposed Ducts in Indoor Locations: Insulation shall have
factory‑applied jacket with or without integral vapor‑barrier, as
required by the service. Where use of factory‑applied jacket would
result in wrinkles or fishmouths, apply the following finishes; where
vapor barrier is not required, apply two coats of ASTM C 916, Class 1,
lagging adhesive with glass cloth or tape embedded between coats; where
vapor barrier is required, apply two coats of Mil. Spec. C‑19565, Type
II, vapor‑barrier coating with glass cloth or tape embedded between
coats. Overlap glass cloth or tape 2 inches at joints. Where regular and
irregular shapes occur, use factory‑applied jackets and other finishes
specified above in combinations.

2\. Concealed Ducts When Vapor‑Barrier is Not Required: Apply no
additional finish.

3\. Concealed Ducts When Vapor Barrier is Required: Insulation shall be
factory applied and meet the requirements of Fed. Spec. HH‑B‑100, Type
I, vapor‑barrier covering. Where use of factory‑applied covering would
result in wrinkles or fishmouths, apply two 1/8‑inch thick coats of Mil.
Spec. C‑19565, Type II, vapor‑barrier coating with glass cloth or tape
embedded between coats. Glass cloth or tape shall overlap 2 inches at
joints. Where regular or irregular shapes occur, factory‑applied jackets
and vapor‑barrier coatings may be used in combination.

4\. Outside Locations: Finish insulation with two coats of
manufacturer\'s recommended vapor‑barrier and weatherproof coating
troweled or sprayed in place to a total wet thickness of 1/4 inch,
reinforced between coats with openweave glass cloth. After second layer
of mastic has dried, coat and seal with a layer of asphalt‑aluminum
sealer brushed in place.

D. Painting: Painting shall be according to \[Section 09910 ‑ Exterior
Painting.\] \[and\] \[Section 09920 - Interior Painting.\]

3.3 FIELD QUALITY CONTROL:

A. Inspection: Installation will be inspected progressively by the
Contracting Officer for compliance with requirements.

B. Testing: Ductwork and equipment shall have been tested by the
Contractor and approved by the Contracting Officer prior to installing
the covering.

3.4 SCHEDULES:

A. Insulation Schedule: Listed below is a schedule of the insulation
thickness to be adhered to unless otherwise noted on the drawings:

TABLE 1

INSULATION THICKNESS

Duct Type Thickness (inch)

Combustion Air Duct 2

Emergency Generator Exhaust Pipe and Muffler 2

(Inside Building)

Evaporative Condenser Intake and Exhaust Ducts 1

Exhaust Ducts within 10\' of Exterior Walls or 1

Openings or from Fan Discharge (whichever is

least)

Outside Air Intake Ducts 2

Plenums (Heating Systems) 2

Rectangular Supply Ducts (Heating Systems) 2

Rectangular Supply Ducts 2

(Systems with Cooling Coils)

Round Supply Ducts (Heating Systems) 2

Round Supply Ducts 2

(Systems with Cooling Coils)

Ventilation Equipment Casings 1

[PART 4: MEASUREMENT AND PAYMENT]{.underline}

4.1 METHOD OF MEASUREMENT:

A. Units: The work described in this section will not be measured for
payment.

4.2 BASIS OF PAYMENT:

A. Payment: No direct payment for the work described under this section
will be made. The Contractor shall include consideration for this item
in the bid price for other items of the Contract.

END OF SECTION