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6. COMMERCIAL
DUCTWORK AND PLENUM
6.2 FINISHES
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B. ROUND DUCTS
INSULATION ON CONCEALED DUCT WORK WILL BE LEFT
AS FACTORY FINISHED WITH NO FURTHER FINISH REQUIRED.
The following finishes apply to exposed duct work
only.
Specification
Code No.
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CRD/1
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Indoor
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– Use flexible insulation with integral
vapour retarder. At all joints and breaks, apply vapour retarder
tape.
– Apply treated
fabric jacket over insulation using fabric adhesive and
finish with one (1) coat of fabric coating.
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CRD/2 |
Indoor |
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– Use scored rigid insulation with integral
vapour retarder on ductwork 600 mm diameter and larger.
– Use flexible insulation with integral
vapour retarder on ductwork smaller than 600 mm diameter.
At all joints and breaks, apply vapour retarder tape.
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Apply treated fabric jacket over insulation using fabric
adhesive and finish with one (1) coat of fabric coating.
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CRD/3
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Indoor
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– Use flexible insulation with integral
vapour retarder.
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At all joints and breaks, apply vapour retarder tape.
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CRD/4
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Outdoor
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– Adhere vapour retarder tape over all
joints and breaks in vapour retarder on cold or dual temp
ductwork.
– Apply
over the insulation surface a stucco embossed aluminum
jacket secured with pop rivets. All joints sealed or flashed
to shed water.
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CRD/5
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Outdoor
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– Apply to the insulation surface a coat
(minimum 1 litre per 1.5 m) of weather coating. While still
wet, embed a layer of reinforcing membrane and finish with
a final coat (minimum 1 litre per 1.5 m) of weather coating.
(Insulation having factory applied vapour retarder is not
required with this finish).
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