ProctorPassive Smartvap 100

Air barrier with variable vapour  diffusion resistance

Product Description

ProctorPassive SmartVap 100 (SmartVap) is a two layer AS4200.1 compliant light duty air barrier and variable vapour diffusion resistance retarder.


When installed as a continuous layer, SmartVap will form an air tight layer, improving the efficacy of ventilation systems and thermal efficiency of the building enclosure. The effective management of air and vapour passage through wall, ceiling and floor assemblies can help protect the building fabric and insulation from condensation and related problems such as mould, timber rot, corrosion and loss of thermal resistance.

SmartVap should not be used on the exterior side of insulation in cold and temperate climates as an alternative to a vapour permeable sarking, where there is a risk that condensation will form on the interior face of the retarder.

Variable vapour diffusion resistance

The functional layer of SmartVap is a polyamide film. Such films passively adjust vapour diffusion resistance depending on the humidity where located. The polyamide absorbs water vapour from the air, opening the molecular pores thus adjusting vapour diffusion resistance according to ambient humidity conditions.

SmartVap is not “smart” enough to tell what season it is, and it would be simplistic to claim vapour tight in winter and vapour open in summer. The vapour resistance of SmartVap is not seasonal, but is influenced by the relative humidity on both sides of the membrane where it is located, whatever the season.

When the ambient humidity is low the diffusion resistance is higher. When the ambient humidity is high, the diffusion resistance is lower. This functionality can assist the building fabric to dry towards the interior when relative humidity is higher, and vapour pressure is lower on the interior side of the membrane.


Although ProctorPassive SmartVap can be used as temporary protection during construction, it can not be used as a primary waterproofing membrane. The product may be damaged by careless handling, high winds or vandalism, and should not be left uncovered for longer than is absolutely necessary. Any damaged areas should be replaced before completion.

Ensure that ProctorPassive SmartVap is covered as soon as possible, and not left exposed to UV for longer than 4 weeks. ProctorPassive SmartVap is not to be used in installations where it could be exposed to long term UV radiation.

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ProctorPassive SmartVap 100 Installation Guide Mar 2024 Codemark

Sample Specification

Vapour and air retarder should be ProctorPassive SmartVap 100 vapour and air retarder membrane, tested to AS/NZS 4200.1:1994 standards, installed in accordance with the product user guide.

Duty classification: Light
Air permeance (EN12114:2001): <0.02 m³/(h.m².50Pa) Emittance: Non-reflective
Flammability Index: Low
Notes: Non conductive and not subject to corrosion

Health and Safety

Information on any known health risks on our products is listed in the Material Safety Data Sheets available from Proctor Group Australia.


The details supplied here are based upon good practice and currently available information and should be read in conjunction with the most up to date product user guide. Please check that the this product is suitable for your particular application. Please contact us to discuss your project and any particular technical enquires.