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6. COMMERCIAL
DUCTWORK AND PLENUM
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Note: The contents of the
Section include the application and finishes of duct and plenum insulation
under Specification Code Numbers CER, CEF, CIR, CIF, CIU, CRF and
CRD. These code numbers are cross referenced in TIAC specification
sections 15250 (23 07 00) – Mechanical Insulation and 15270 (23 07
13) – Ductwork Insulation.
6.1 APPLICATION
A. RIGID INSULATION EXTERNAL APPLICATION
Specification
Code No.
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CER/1 |
Hot Duct and Plenum – (20° to
65°C)
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– Preparation: Fix mechanical fasteners
to both horizontal and vertical surfaces at approximately
300 mm centres, each direction.
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Application: Cut insulation without integral vapour retarder
to required size and apply to exterior of duct and/or plenum,
with horizontal surfaces overlapping vertical surfaces
and edges tightly butted together. Secure insulation by
impaling on mechanical fasteners. (See Note 1) |
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CER/2
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Cold or Dual Temp Duct and Plenum
– (Ambient to 65°C)
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– Preparation: Fix mechanical fasteners
to both horizontal and vertical surfaces at approximately
300 mm on centres, each direction.
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Application: Cut insulation with integral vapour retarder
to required size and apply to exterior of duct and/or plenum
with vapour retarder to the warm side with horizontal surfaces
overlapping vertical surfaces. Butt edges together tightly.
Secure insulation by impaling on mechanical fasteners.
Where mechanical fasteners penetrate vapour retarder, and
at all corners and joints, apply vapour retarder tape or
vapour retarder strips adhered with vapour retarder adhesive.
Where raised seams are encountered, secure to the seams
an overlapping strip of flexible insulating material with
integral vapour retarder to provide a continuous vapour
retarder. (See Note 1)
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CER/3 |
Outside Air Duct and Plenum –
(–40°C
to Ambient) |
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– As CER/2 above but firstly apply
a layer of rigid insulation without vapour retarder before
applying
layer of rigid insulation with vapour retarder. All joints
shall be staggered.
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Note 1: For external applications of rigid insulation
(CER/1 and CER/2) where the use of mechanical fasteners is
unsuitable due to space limitations, twine or wire fastenings,
insulation adhesive or other suitable method of attachment
may be substituted.
Note 2: Except where specifically called
for in the Insulation section of the project specifications,
where an interior duct
liner is used, external insulation shall not be applied. |
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