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6. COMMERCIAL
DUCTWORK AND PLENUM
6.2 FINISHES
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A. RECTANGULAR DUCTS
INSULATION ON CONCEALED DUCTWORK WILL BE LEFT
AS FACTORY FINISHED WITH NO FURTHER FINISH REQUIRED.
The following finishes apply to exposed ductwork
and plenums only.
Specification
Code No.
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CRF/1
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Indoor
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– Use rigid insulation with an integral
vapour retarder. Apply continuous metal corner bead to all
corners. Adhere vapour retarder tape over all joints and
breaks in vapour retarder, and at all corners.
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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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CRF/2 |
Indoor |
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– Use rigid insulation with an integral
vapour retarder. Apply continuous metal corner bead to all
corners. Adhere vapour retarder tape over all joints and
breaks in vapour retarder, and at all corners. |
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CRF/3
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Outdoor
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– Adhere vapour retarder tape over all
joints and breaks in vapour retarder and at all corners on
cold or dual temp ductwork.
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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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CRF/4
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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
2 required with this finish).
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