Reasons for Building Airtight

Air leakage accounts for 15-25% of winter heat loss in buildings

Your Home (Australian Government)

Pro Clima’s patented airtightness and weathertightness building systems, in combination with effective insulation and appropriate ventilation, create comfortable, energy-efficient, low allergen-emitting,  healthy homes and places of business.

The system ensures the long term effectiveness of insulation and the structural durability of buildings; enabling them to last for many years into the future.

• Saving energy

Air­tight struc­tures are en­ergy ef­fi­cient. They en­sure that heat in­su­la­tion func­tions op­tim­ally. This re­duces heat­ing costs and CO2 emis­sions; pro­tect­ing the cli­mate and your wal­let alike.

• Preventing structural damage

Air-sealing helps to protect against mould, rot and other struc­tur­al damage. These types of problems are often the result of indoor air penetrating the thermal insulation during winter, which causes large amounts of condensation.

• Maintaining healthy living spaces

Air-seal­ing prevents mould; reduces air dryness during winter; and keeps liv­ing spaces cooler for longer during sum­mer.

You can read more about the benefits of building airtightness on Pro Clima's website. The study entitled Pro Clima New Zealand: Airtightness & Moisture Management is also very informative in dealing with various building physics. It contains practical examples and case studies.

Why Pro Clima?

Pro Clima has been providing airtight building solutions out of Germany since 1981. Pro Clima Australia Pty. Ltd. was established in 2010 following a number of years of extensive research, which identified a need for high-quality air and weather tightness products in Australia. Today, Pro Clima continues to be a leader in the development and manufacture of high performance sealing systems.

Pro Clima's Director, Lothar Moll, is a world leading expert in building physics. In 1994 he discovered the MVTR-variable membrane. This technology became an integral part of Pro Clima's patented Intelligent Airtightness System (IAS) in the form of the INTELLO building membrane.

Membrane Types



INTELLO PLUS is a high performance airtight and moisture controlling building membrane. It creates the inner boundary for thermal insulation in walls, roofs, ceilings and floors. It is generally applied on the inside of the building between the stud work and the internal cladding.

INTELLO PLUS enables buildings to achieve exceptional levels of airtightness, up to and surpassing the Passive House requirement of 0.6 ACH.

INTELLO PLUS is an intelligent membrane. By sensing humidity variations, it is capable of adapting its molecular structure, in order to allow or deny the passage of moisture as required. This modern building technology provides maximum protection from structural damage and mould; even in the most complex of building structures, and extreme environments.







SOLITEX EXTASANA creates the outer boundary for thermal insulation in walls, roofs, ceilings and floors. It is generally applied on the outside of the building, between the studwork and external cladding.

SOLITEX EXTASANA is highly moisture permeable, and does not vary its permeability like INTELLO PLUS does. It readily allows moisture to escape the building's wall cavity, but does not allow external water or rain drops to get in (similar to say, a Gore-tex rain jacket).

SOLITEX EXTASANA is also thicker than INTELLO PLUS, and has a high resistance to UV exposure; making it more durable, and ideal for external applications.

The membrane can be exposed to the Australian elements for up to 90 days when applied to building walls.


SOLITEX MENTO membranes are designed to be used with most wall and roof cladding systems. They are generally applied to the roof of the building, between the trusses and the roof cladding.

SOLITEX MENTO has a higher resistance to UV exposure than SOLITEX EXTASANA, making it ideal for rooftop applications.

SOLITEX MENTO can be exposed to the Australian elements for up to 90 days when applied to rooftops.


Membrane Fixing Components


EXTORA is a super-adhesive, highly-durable tape. It is used to fix EXTASANA (external) membranes together, and to seal the membranes against window sills and other membrane openings or penetrations.

It is waterproof; UV stabilised for up to 90 days; and can even be applied to cold and/or wet surfaces.

TESCON VANA Air-sealing Tape

VANA is a super-adhesive, highly-durable tape. It is used to fix INTELLO PLUS (internal) building membranes together, and to seal the membranes against window sills and other membrane openings or penetrations.

It is diffusion open, and can be applied to cold surfaces (-10oC).

No-Warp (Polyurethane) Foam

Touch 'n Seal No-Warp PU Foam is used to permanently seal around doors, windows and skylights; without bowing jambs or deflecting frames.

It insulates, blocks drafts and prevents unwanted passage of moisture.

ORCON CLASSIC Multi-purpose Adhesive

ORCON is a multi-purpose adhesive with exceptionally high cohesion properties. It is suitable for bonding all types of Pro Clima membranes and will also adhere well to adjoining structural components such as concrete slabs and timber framing.

It is generally applied at the base of the internal walls to fix INTELLO PLUS membranes to the building slab.

Air-sealing Grommets

Various air-sealing grommets and other solutions are available to cater for electrical wires, plumbing fittings and various other membrane penetrations.

These include various Kaflex and Roflex products.


The Pro Clima Instaabox is the ideal solution to be used when sealing light switches, power-points and other wall systems without a service cavity.

The Pro Clima Model

[Interactive Image]

Hover your mouse cursor over the points on the image above & learn about the Pro Clima solutions that LAROS Technologies can provide.



How it Works

Condensation within building structures is a major issue that affects the health and longevity of a building. It is caused by variations in temperature and humidity levels between the internal and external environments. Warm air will always flow towards cooler air. As it does so, it carries with it a certain amount of moisture content. If it cools down enough, this moisture will leave the air in the form of condensation.

graphic showing general moisture diffusion in summer and winter1. Without Vapour Barriers

When there are no vapour barriers in place; in summer, this risks the formation of condensation on the inside of the internal wall; and in winter, this risks the formation of condensation on the inside of the external wall. Both of these situations can lead to mould, rot and further damage to the building structure.

graphic showing effects of a vapour retarder inside building2. Blocking Vapour at the Internal Wall

Blocking the passage of air and vapour at the internal wall works well in winter, as moisture is never allowed to enter the wall cavity. However, in summer, moisture content that enters from outside infiltration air becomes trapped inside the wall cavity and is unable to escape through to the inside of the building.

graphic showing the effects of a vapour retarder outside building3. Blocking Vapour at the External Wall

Similarly, blocking the passage of air and vapour at the external wall works well in summer, but traps moisture content inside the wall during winter.


graphic showing aan intelligent pro clima system4. Pro Clima's Intelligent Solution

The solution is found in INTELLO PLUS and its permeability variable membrane. The membrane is generally closed to vapour diffusion during the winter (lower humidity levels) and open to vapour diffusion during the summer (higher humidity levels). This combines the two positive cases above, to create an optimised system solution.

INTELLO's Diffusion Variability

INTELLO PLUS varies its permeability levels depending on the humidity of its environment. Allowing diffusion of moisture from outside through to inside in summer, and preventing excessive moisture from entering your walls during winter.

graph showing variability of INTELLO permeability against humidity change

graphic showing the relative humidities across building membranes

Graphic showing diffusion through intello in summer and winter always working out of the walls and towards the building interior


Further information is available on Pro Clima's website and in the study entitled Pro Clima New Zealand: Airtightness & Moisture Management.


Safety Data Sheets


Pro Clima Technical Hotline

Wood con­struc­tion and civil en­gin­eers as­sist you quickly, simply and com­pet­ently.
Providing solu­tions for design­ing your struc­ture cost-ef­fect­ively, se­curely and with a healthy liv­ing en­vir­on­ment.

Telephone +61 1800 776 254
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Telephone +64 0800 776 254
E-mail wel­come@pro­