HomeMy WebLinkAbout23 07 13 - Duct InsulationBEARDSLEY DESIGN ASSOCIATES
CORNELL – NCP DUCT INSULATION
STANDARD SPECIFICATIONS 23 07 13 –PAGE 1 OF 7
NOVEMBER 2, 2012
SECTION 230713 DUCT INSULATION
PART 1 GENERAL
1.1 SUBMITTALS
A. Product Data: Provide for each type of product indicated. Include thermal
conductivity, water0vapor permeance thickness, and jackets (both factory0
and field0applied if any).
1.2 QUALITY ASSURANCE
A. Installer Qualifications: Skilled mechanics who have successfully completed
an apprenticeship program or another craft training program certified by the
Department of Labor, Bureau of Apprenticeship and Training.
PART 2 PRODUCTS
2.1 INSULATION THICKNESS AND TYPES
A. All supply and return ductwork in non0conditioned spaces shall be insulated
as follows:
1. Exposed Ductwork: 1.50inches rigid fiberglass board, 3.0 pounds per
cubic foot density, to a minimum R0value of 5, complete with a factory
applied reinforced aluminum foil vapor barrier, suitably anchored and
sealed at all points.
2. Concealed Ductwork: 1.50inches fiberglass blanket, 0.75 pounds per
cubic foot density, to a minimum R0value of 5, complete with a factory
applied vapor barrier, suitably anchored and sealed at all points
B. The use of flexible elastomeric insulation on ductwork is permitted as an
acceptable alternative to fiberglass. Insulation shall be adhered to 100% of
the duct surface area.
C. Preferred Manuafacturers
1. Johns Manville
2. Knauf
3. Owens Corning
4. Armacell, LLC
2.2 ADHESIVES
A. Materials shall be compatible with insulation materials, jackets, and
substrates and for bonding insulation to itself and to surfaces to be insulated
unless otherwise indicated.
B. Flexible Elastomeric Adhesive: Comply with MIL0A024179A, Type II, Class I.
BEARDSLEY DESIGN ASSOCIATES
CORNELL – NCP DUCT INSULATION
STANDARD SPECIFICATIONS 23 07 13 –PAGE 2 OF 7
NOVEMBER 2, 2012
1. For indoor applications, use adhesive that has a VOC content of 50 g/L or
less when calculated according to 40 CFR 59, Subpart D (EPA
Method 24).
2. Use adhesive that complies with the testing and product requirements of
the California Department of Health Services' "Standard Practice for the
Testing of Volatile Organic Emissions from Various Sources Using Small0
Scale Environmental Chambers," including 2004 Addenda.
C. Mineral0Fiber Adhesive: Comply with MIL0A03316C, Class 2, Grade A.
1. For indoor applications, use adhesive that has a VOC content of 80 g/L or
less when calculated according to 40 CFR 59, Subpart D (EPA
Method 24).
2. Use adhesive that complies with the testing and product requirements of
the California Department of Health Services' "Standard Practice for the
Testing of Volatile Organic Emissions from Various Sources Using Small0
Scale Environmental Chambers," including 2004 Addenda.
D. ASJ Adhesive, and FSK Jacket Adhesive: Comply with MIL0A03316C,
Class 2, Grade A for bonding insulation jacket lap seams and joints.
1. For indoor applications, use adhesive that has a VOC content of 50 g/L or
less when calculated according to 40 CFR 59, Subpart D (EPA
Method 24).
2. Use adhesive that complies with the testing and product requirements of
the California Department of Health Services' "Standard Practice for the
Testing of Volatile Organic Emissions from Various Sources Using Small0
Scale Environmental Chambers," including 2004 Addenda.
2.3 MASTICS
A. Materials shall be compatible with insulation materials, jackets, and
substrates; comply with MIL0PRF019565C, Type II.
1. For indoor applications, use mastics that have a VOC content of 50 g/L or
less when calculated according to 40 CFR 59, Subpart D (EPA
Method 24).
B. Vapor0Barrier Mastic: Water based; suitable for indoor use on below ambient
services.
1. Water0Vapor Permeance: ASTM E 96/E 96M, Procedure B, 0.013 perm
(0.009 metric perm) at 430mil (1.090mm) dry film thickness.
2. Service Temperature Range: Minus 20 to plus 180 deg F (Minus 29 to
plus 82 deg C).
3. Solids Content: ASTM D 1644, 58 percent by volume and 70 percent by
weight.
4. Color: White.
2.4 TAPES
A. FSK Tape: Foil0face, vapor0retarder tape matching factory0applied jacket
with acrylic adhesive; complying with ASTM C 1136.
1. Width: 3 inches (75 mm).
2. Thickness: 6.5 mils (0.16 mm).
BEARDSLEY DESIGN ASSOCIATES
CORNELL – NCP DUCT INSULATION
STANDARD SPECIFICATIONS 23 07 13 –PAGE 3 OF 7
NOVEMBER 2, 2012
3. Adhesion: 90 ounces force/inch (1.0 N/mm) in width.
4. Elongation: 2 percent.
5. Tensile Strength: 40 lbf/inch (7.2 N/mm) in width.
6. FSK Tape Disks and Squares: Precut disks or squares of FSK tape.
2.5 SECUREMENTS
A. Insulation Pins and Hangers:
1. Cupped0Head, Capacitor0Discharge0Weld Pins: Copper0 or zinc0coated
steel pin, fully annealed for capacitor0discharge welding, 0.1060inch0 (2.60
mm0) diameter shank, length to suit depth of insulation indicated with
integral 101/20inch (380mm) galvanized carbon0steel washer.
2. Metal, Adhesively Attached, Perforated0Base Insulation Hangers:
Baseplate welded to projecting spindle that is capable of holding
insulation, of thickness indicated, securely in position indicated when self0
locking washer is in place. Comply with the following requirements:
a. Baseplate: Perforated, galvanized carbon0steel sheet, 0.030 inch
(0.76 mm) thick by 2 inches (50 mm) square.
b. Spindle: Copper0 or zinc0coated, low0carbon steel, fully annealed,
0.1060inch0 (2.60mm0) diameter shank, length to suit depth of
insulation indicated.
c. Adhesive: Recommended by hanger manufacturer. Product with
demonstrated capability to bond insulation hanger securely to
substrates indicated without damaging insulation, hangers, and
substrates.
3. Insulation0Retaining Washers: Self0locking washers formed from 0.0160
inch0 (0.410mm0) thick, galvanized0steel sheet, with beveled edge sized as
required to hold insulation securely in place but not less than 101/2 inches
(38 mm) in diameter.
a. Protect ends with capped self0locking washers incorporating a spring
steel insert to ensure permanent retention of cap in exposed locations.
B. Staples: Outward0clinching insulation staples, nominal 3/40inch0 (190mm0)
wide, stainless steel or Monel.
PART 3 EXECUTION
3.1 GENERAL INSTALLATION REQUIREMENTS
A. Install insulation materials, accessories, and finishes with smooth, straight,
and even surfaces; free of voids throughout the length of ducts and fittings.
B. Install accessories compatible with insulation materials and suitable for the
service. Install accessories that do not corrode, soften, or otherwise attack
insulation or jacket in either wet or dry state.
C. Install insulation with longitudinal seams at top and bottom of horizontal runs.
BEARDSLEY DESIGN ASSOCIATES
CORNELL – NCP DUCT INSULATION
STANDARD SPECIFICATIONS 23 07 13 –PAGE 4 OF 7
NOVEMBER 2, 2012
D. Install multiple layers of insulation with longitudinal and end seams
staggered.
E. Keep insulation materials dry during application and finishing.
F. Install insulation with tight longitudinal seams and end joints. Bond seams
and joints with adhesive recommended by insulation material manufacturer.
G. Install insulation with least number of joints practical.
H. Where vapor barrier is indicated, seal joints, seams, and penetrations in
insulation at hangers, supports, anchors, and other projections with vapor0
barrier mastic.
1. Install insulation continuously through hangers and around anchor
attachments.
2. For insulation application where vapor barriers are indicated, extend
insulation on anchor legs from point of attachment to supported item to
point of attachment to structure. Taper and seal ends at attachment to
structure with vapor0barrier mastic.
3. Install insert materials and install insulation to tightly join the insert. Seal
insulation to insulation inserts with adhesive or sealing compound
recommended by insulation material manufacturer.
I. Apply adhesives, mastics, and sealants at manufacturer's recommended
coverage rate and wet and dry film thicknesses.
J. Install insulation with factory0applied jackets as follows:
1. Draw jacket tight and smooth.
2. Cover circumferential joints with 30inch0 (750mm0) wide strips, of same
material as insulation jacket. Secure strips with adhesive and outward
clinching staples along both edges of strip, spaced 4 inches (100 mm) o.c.
3. Overlap jacket longitudinal seams at least 101/2 inches (38 mm). Clean
and dry surface to receive self0sealing lap. Staple laps with outward
clinching staples along edge at 2 inches (50 mm) o.c.
a. For below ambient services, apply vapor0barrier mastic over staples.
4. Cover joints and seams with tape, according to insulation material
manufacturer's written instructions, to maintain vapor seal.
5. Where vapor barriers are indicated, apply vapor0barrier mastic on seams
and joints and at ends adjacent to duct flanges and fittings.
K. Cut insulation in a manner to avoid compressing insulation more than 75
percent of its nominal thickness.
L. Finish installation with systems at operating conditions. Repair joint
separations and cracking due to thermal movement.
M. Repair damaged insulation facings by applying same facing material over
damaged areas. Extend patches at least 4 inches (100 mm) beyond
damaged areas. Adhere, staple, and seal patches similar to butt joints.
BEARDSLEY DESIGN ASSOCIATES
CORNELL – NCP DUCT INSULATION
STANDARD SPECIFICATIONS 23 07 13 –PAGE 5 OF 7
NOVEMBER 2, 2012
3.2 INSTALLATION OF MINERAL0FIBER INSULATION
A. Blanket Insulation Installation on Ducts and Plenums: Secure with adhesive
and insulation pins.
1. Apply adhesives according to manufacturer's recommended coverage
rates per unit area, for 100 percent coverage of duct and plenum surfaces.
2. Apply adhesive to entire circumference of ducts and to all surfaces of
fittings and transitions.
3. Install cupped0head, capacitor0discharge0weld pins on sides and bottom of
horizontal ducts and sides of vertical ducts as follows:
a. On duct sides with dimensions 18 inches (450 mm) and smaller,
place pins along longitudinal centerline of duct. Space 3 inches (75
mm) maximum from insulation end joints, and 16 inches (400 mm)
o.c.
b. On duct sides with dimensions larger than 18 inches (450 mm), place
pins 16 inches (400 mm) o.c. each way, and 3 inches (75 mm)
maximum from insulation joints. Install additional pins to hold
insulation tightly against surface at cross bracing.
c. Pins may be omitted from top surface of horizontal, rectangular ducts
and plenums.
d. Do not overcompress insulation during installation.
e. Impale insulation over pins and attach speed washers.
f. Cut excess portion of pins extending beyond speed washers or bend
parallel with insulation surface. Cover exposed pins and washers
with tape matching insulation facing.
4. For ducts and plenums with surface temperatures below ambient, install
a continuous unbroken vapor barrier. Create a facing lap for longitudinal
seams and end joints with insulation by removing 2 inches (50 mm) from
one edge and one end of insulation segment. Secure laps to adjacent
insulation section with 1/20inch (130mm) outward0clinching staples, 1 inch
(25 mm) o.c. Install vapor barrier consisting of factory0 or field0applied
jacket, adhesive, vapor0barrier mastic, and sealant at joints, seams, and
protrusions.
a. Repair punctures, tears, and penetrations with tape or mastic to
maintain vapor0barrier seal.
b. Install vapor stops for ductwork and plenums operating below 50
deg F (10 deg C) at 180foot (5.50m) intervals. Vapor stops shall
consist of vapor0barrier mastic applied in a Z0shaped pattern over
insulation face, along butt end of insulation, and over the surface.
Cover insulation face and surface to be insulated a width equal to two
times the insulation thickness, but not less than 3 inches (75 mm).
5. Overlap unfaced blankets a minimum of 2 inches (50 mm) on longitudinal
seams and end joints. At end joints, secure with steel bands spaced a
maximum of 18 inches (450 mm) o.c.
6. Install insulation on rectangular duct elbows and transitions with a full
insulation section for each surface. Install insulation on round and flat0
oval duct elbows with individually mitered gores cut to fit the elbow.
7. Insulate duct stiffeners, hangers, and flanges that protrude beyond
insulation surface with 60inch0 (1500mm0) wide strips of same material
BEARDSLEY DESIGN ASSOCIATES
CORNELL – NCP DUCT INSULATION
STANDARD SPECIFICATIONS 23 07 13 –PAGE 6 OF 7
NOVEMBER 2, 2012
used to insulate duct. Secure on alternating sides of stiffener, hanger,
and flange with pins spaced 6 inches (150 mm) o.c.
B. Board Insulation Installation on Ducts and Plenums: Secure with adhesive
and insulation pins.
1. Apply adhesives according to manufacturer's recommended coverage
rates per unit area, for 100 percent coverage of duct and plenum surfaces.
2. Apply adhesive to entire circumference of ducts and to all surfaces of
fittings and transitions.
3. Install either capacitor0discharge0weld pins and speed washers or cupped0
head, capacitor0discharge0weld pins on sides and bottom of horizontal
ducts and sides of vertical ducts as follows:
a. On duct sides with dimensions 18 inches (450 mm) and smaller, place
pins along longitudinal centerline of duct. Space 3 inches (75 mm)
maximum from insulation end joints, and 16 inches (400 mm) o.c.
b. On duct sides with dimensions larger than 18 inches (450 mm), space
pins 16 inches (400 mm) o.c. each way, and 3 inches (75 mm)
maximum from insulation joints. Install additional pins to hold
insulation tightly against surface at cross bracing.
c. Pins may be omitted from top surface of horizontal, rectangular ducts
and plenums.
d. Do not overcompress insulation during installation.
e. Cut excess portion of pins extending beyond speed washers or bend
parallel with insulation surface. Cover exposed pins and washers with
tape matching insulation facing.
4. For ducts and plenums with surface temperatures below ambient, install a
continuous unbroken vapor barrier. Create a facing lap for longitudinal
seams and end joints with insulation by removing 2 inches (50 mm) from
one edge and one end of insulation segment. Secure laps to adjacent
insulation section with 1/20inch (130mm) outward0clinching staples, 1 inch
(25 mm) o.c. Install vapor barrier consisting of factory0 or field0applied
jacket, adhesive, vapor0barrier mastic, and sealant at joints, seams, and
protrusions.
a. Repair punctures, tears, and penetrations with tape or mastic to
maintain vapor0barrier seal.
b. Install vapor stops for ductwork and plenums operating below 50
deg F (10 deg C) at 180foot (5.50m) intervals. Vapor stops shall
consist of vapor0barrier mastic applied in a Z0shaped pattern over
insulation face, along butt end of insulation, and over the surface.
Cover insulation face and surface to be insulated a width equal to two
times the insulation thickness, but not less than 3 inches (75 mm).
5. Install insulation on rectangular duct elbows and transitions with a full
insulation section for each surface. Groove and score insulation to fit as
closely as possible to outside and inside radius of elbows. Install
insulation on round and flat0oval duct elbows with individually mitered
gores cut to fit the elbow.
BEARDSLEY DESIGN ASSOCIATES
CORNELL – NCP DUCT INSULATION
STANDARD SPECIFICATIONS 23 07 13 –PAGE 7 OF 7
NOVEMBER 2, 2012
6. Insulate duct stiffeners, hangers, and flanges that protrude beyond
insulation surface with 60inch0 (1500mm0) wide strips of same material
used to insulate duct. Secure on alternating sides of stiffener, hanger, and
flange with pins spaced 6 inches (150 mm) o.c.
END OF SECTION 230713