INTELLO & DB+ Approved by DIBt for Use in Unvented Hot Roof Assemblies

The highly respected Federal Agency Deutsches Institut für Bautechnik (DIBt)* has certified INTELLO PLUS and DB+,  per German testing standard DIN68800-2, for use in unvented assemblies with vapor closed exteriors.  Such assemblies include unvented metal roofs, green roofs and gravel roof flat roofs, as well as vapor closed pitched roofs with asphalt shingles, EPDM, TPO etc.  With this certification these materials are now officially building code compliant in Germany.  As a result it is now possible to design and build assemblies in Germany with vapor closed exterior roofs without any additional sign-offs of local building officials.  (The INTELLO certificate is here and the DB+ certificate is here.)

Please head over to 475 High Performance Building Supply to read the Full Article


Passive House – Increasing Interest in Canada

Organizers of the Passive House (PH) pavilion and related educational seminars at Buildex Vancouver 2016 say they are a sign of the increasing interest in Canada about building to the internationally recognized PH standard of energy efficiency. “After a successful launch in 2014, we expanded the pavilion to create what we have now,” said Malcolm Cairns, chairman of the Canadian Passive House Institute West Buildex Vancouver committee.

Head over to the Journal of Commerce to read the Full Article.


Ireland Streaming Ahead with Better Buildings

Dublin local authority makes passive house mandatory in historic vote

All new buildings in south-east Dublin must be built to the passive house standard or demonstrably equivalent levels, in a move that may lead to the construction of upwards of 20,000 passive houses by 2022.

Dún Laoghaire-Rathdown County Council adopted its county development plan for 2016-2022 on Wednesday 17 February, including a motion worded by Passive House Plus editor Jeff Colley that all new buildings must be built to the passive house standard or equivalent…

Head over to to read the Full Article.


LAROS at the South Pacific Passive House Conference 2016

LAROS had a wonderful weekend at the South Pacific Passive House Conference Priligy Generic held at the University of Melbourne, Sidney Myer building with lots of interest and curious minds at our booth.
We would like to thank all those who attended locally and internationally, the speakers with their brilliant presentations and Clare Parry from the Australian Passive House Association.

It has been a great start to the year and we look forward to the next conference held in New Zealand!

@AusPHAssoc #SPPHC2016



Passivhaus Workshops


Join us at 5 Bodalla Place for our upcoming Passivhaus/High-Performance Workshops!
Come along and meet our guest speakers, learn about many different aspects relating to your Passivhaus project.

Workshop Agenda   –   15 minute introductions from:

Round table discussions with our guest speakers and our attendees. Utilise this opportunity by asking our experts and we’ll have answers for all your Passivhaus queries. Other guest speakers may be announced on the night.

LAROS Technologies will be hosting two separate workshops. Please register your interest below for your relevant workshop.

Workshop Cost:
$45 per person


   Workshop 1 – for Architects & Designers
   Friday, 29 January   2pm – 5pm

   Workshop 2 – for Builders & Owner Builders
   Friday, 26 February   2pm – 5pm

Airtightness and Ventilation for Comfortable Homes

‘A wall is not a ventilation system, therefore airtightness is not the enemy.’

INFILTRATION IS NOT VENTILATIONHow are our houses being ventilated? The answer is “poorly”. There is an accidental reliance on infiltration through the building to provide some background air movement, but this is not fresh outdoor air as required by the building code (G4 Ventilation). Nor is it controllable — when it is windy there is a greater rate of air change per hour, but a few days of calm or in a sheltered environment and the percentage of CO2 in the air could be at ‘sleep inducing’ levels. Never mind the relative humidity inside the building.
Yet this is how the problems start. We want to be comfortable in our homes, insulated from the weather — including stopping drafts. By doing this we raise the requirement for intervention either by opening windows or by using a mechanical ventilation system read more

Fluid Dynamic Modelling

Fluid Dynamic Modelling & Balancing – For Energy Recovery Ventilation (ERV) Systems
All ducted ventilation systems have to be designed such that the supplied airflow coming out of each vent in each room is sufficient for the requirements of the space.For example, a living area that may have 4 people in it for extended periods of time will need about 4 times as much fresh air as a bedroom that might have 1 person in it overnight. From another perspective, the amount of stale air needing to be extracted from a laundry will be much less than the amount extracted from the kitchen due to  humidity and smells generated from cooking.In order to maximize energy recovery potential, that supply air must be balanced with an equal volume of extracted air which is only understood through balancing a system with fluid dynamic modelling. It is through this process that ducting layout and sizing can be understood and specified in order to achieve the correct volume of supply and extraction.

Consideration must also be paid to the amount of restriction and airflows through vents in each room to ensure silent operation with minimum air movement noise. LAROS calculates the pressures and flows throughout both the supply and exhaust ducting systems using fluid dynamic modelling and optimises the ducting sizes and runs to ensure adequate airflow through the entire building with minimum noise.

Complimentary definitions:

CFD stands for computational fluid dynamics (and heat transfer). As per this technique, the governing differential equations of a flow system or thermal system are known in the form of Navier–Stokes equations, thermal energy equation and species equation with an appropriate equation of state.[1] In the past few years, CFD has been playing an increasingly important role in building design, following its continuing development for over a quarter of a century. The information provided by CFD can be used to analyse the impact of building exhausts to the environment, to predict smoke and fire risks in buildings, to quantify indoor environment quality, and to design natural ventilation systems, etc.


Jerrabomberra Tennis Facility – Canberra's first pre-fabricated Passivhaus!

The Jerrabomberra Tennis Facility is a showcase of Passive House (German: Passivhaus) and Low-e technologies encapsulated within a factory pre-fabricated high-performance building.  This video shows the erection of the building envelope in poor weather conditions near Canberra.

This high-performance energy-efficient and sustainable building includes:

  • Fully insulated concrete slab with extruded polystyrene (XPS) by Foamex
  • Thermally-broken strip footings using Novomur thermoblocks by Schöck (Germany)
  • Slab preparation and construction by Urbis Constructions
  • Airtight building envelope employing PANELlite factory pre-fabricated wall and roof elements by CARBONlite
  • Double-glazed, thermally-broken & insulated windows, doors & curtain-walls with RAICO (Germany)
  • Energy recovery ventilation (ERV) systems by Stiebel-Eltron and LUNOS (Germany)
  • Solar heat gain control employing tracked zipScreen fabric blinds from ROMA (Germany)
  • Active humidity sensing extractor toilet fan technology Silvento from LUNOS (Germany)
  • Super-critical CO2-based heat-pump hot water system from Sanden (Japan)
  • Solar-powered LED skylight solutions by Illume / Kimberley
  • Rainwater harvesting for toilet flushing.

Air-tightness, blower-door testing

Find air leakages as a result of air pressure measurement testing
Measuring an existing building’s air-tightness or checking a new build’s air-tightness after installation of building wraps are done by generating a gentle vacuum in the house through the Blower Door fan or 50 Pascal (similar to a wind loading of a moderate breeze on the building).

The fan measures how much air is being removed to keep the pressure difference at 50 Pascal. It is then possible to find the air leakage points in the building envelope.

Finding the air leakage points is done by several methods:

  • feeling airflow by hand
  • using a Thermoanemometer
  • using a hand-held smoke puffer
  • or the use of an infrared camera (ThermaCAMTM B2).

The Blower Door has proven itself in everyday measurement applications, and is automatically controlled from the DG-700 pressure gauge – you just monitor the readout of the measured results on the screen. Using these results, the Tectite Express software generates a complete test report in accordance with EN 13829.

Efficacy of airtightness testing: Whether you have an energy efficient house or an old draughty building, the Blower Door can measure airtightness. The unit has an output of from 35 to 7200 m3/h, and by using more than one Blower Door unit in parallel, even the largest building can be tested.