The Northern Territory’s lands and planning minister David Tollner has set up a review group chaired by 2014 Gold Medal co-winner Phil Harris. The review group will examine the incompatibility between the National Construction Code and design suitable for Australia’s northern tropical climate.
The minister said there were concerns that the regulations favour “esky” homes most suitable for southern Australia that rely on air-conditioning and have small windows.
In their AS Hook Address, Gold Medal winners Phil Harris and Adrian Welke, both of Troppo Architects, reflected on the disparity between the concept of sustainable design in different Australian climates.
“As a rule, our free-running tropical buildings, regionally proud, built on tradition and with the lowest imaginable energy inputs, in fact receive 0 of a maximum 10 stars – even when they win sustainable architecture awards,” they said.
Harris will chair the independent Domestic Building Code Review Group, which will be made up of architects, builders and engineers from a number of organizations including Troppo Architects, the Building Designers Association, Engineers Australia, the Australian Building Sustainability Association, Master Plumbers NT, the Housing Industry Association and the Master Builders Association.
“Whilst well-intentioned, energy-efficiency provisions under the national code have led us away from our common-sensical past,” Harris said.
“With the science of today, this review offers a great opportunity to get back to shaping a charismatic tropical face for Darwin, building on the Top End’s unique architectural heritage.”
The minister said the group was formed to encourage more “tropical-friendly” homes in the region.
“Territory homes have to comply with the National Construction Code, but this code was designed with the aim of encouraging energy-efficiency in the southern states,” Tollner said.
“It means new homes in the Top End are highly insulated and there is concern this discourages the use of traditional cooling features, such as verandas and large louvred windows. That’s why I’m bringing together our local building experts to review how these requirements affect housing in the NT and how we can fix the situation.”
Draft changes to the National Construction Code were recently criticized by built environment experts for relaxing regulations regarding energy efficiency. Changes to the National Construction Code are due to come into effect from 1 May 2016, and will be set in place for three years.
The group will receive some administrative support from the territory government’s Building Advisory Services department, and will deliver a final report to the minister in March 2016.
Source : http://architectureau.com
Business confidence in Queensland's building and construction sector is on the rise, according to an industry survey. Master Builders' survey of industry conditions for the June quarter has found an "upswing" in business mood. Master Builders deputy executive director Paul Bidwell said the survey was a helpful gauge for "specific industry expectations" right across Queensland. "These results reflect a period of stability in Queensland, following the state election and the scaling back of mining investment," he said. "Optimism has been boosted by an improved unemployment rate and continued low interest rates. "The good news for the construction sector is that, relative to the wider economy, it is expected to perform strongly. "And within the industry there are a significant number (37 per cent) that expect the industry to improve further." Labour costs were identified as the number one constraint to growth. "While the labour market has been flexible enough to respond to the increase in demand until now, it appears to be reaching the limits of that flexibility," the report found. The report also found the outlook for housing affordability had "deteriorated slightly" over the June quarter. Just 27 per cent thought the situation would improve, with 23 per cent thinking it would worsen. The remaining 50 per cent thought it would remain the same. "While interest rates remain low and building costs are competitive, the ability to invest has declined due to stagnating wages and a tightening of finance terms by banks, especially for investors," the report found. "New housing continues to be beyond the reach of many, with more than 67 per cent of respondents identifying affordability as having a negative impact on new housing demand." The report found south-east Queensland, particularly the Gold and Sunshine coasts, continued to be the "driver of growth".
"Central Queensland has had a strong quarter as a result of the Cyclone Marcia repair work," the report found. "The challenge now will be to turn this kick-start into ongoing momentum. "While Mackay and Whitsunday continues to struggle, some optimism is beginning to return and this is expected to continue. "Each of the remaining regions returned an improved performance on the previous quarter but continue to struggle with less than positive results."
Read more: http://www.brisbanetimes.com.au/queensland/gold-sunshine-coasts-driving-construction-confidence-master-builders-20150817-gj181s.html#ixzz3j5kBBEsp
Source : www.brisbanetimes.com.au
A great guide to the acceptable levels of building standards and tolerances for clients, builders and designers to reference. As sourced from the Queensland Building and Construction Commission.
This Guide has been compiled in response to community and industry concerns that identified a need to collate general building standards and tolerances into one, easy to read document.
The tolerances and standards identified in this publication have not been created by the authors but have been sourced and collated from existing legislative provisions, the National Construction Code, Australian Standards, manufacturers installation requirements and other recognised industry standards in Queensland (e.g. Timber Queensland Technical Data Sheets).
It is hoped that the publication will provide an impartial, quick and easy first reference for clients and contractors in relation to applicable standards and tolerances in Queensland thereby, reducing the likelihood of disputation in relation to such standards and tolerances.
Source : Queensland Building and Construction Commission.
Does Australia's energy rating scheme for houses actually encourage the use of air-conditioning?
In the 2014 AS Hook Address, Adrian Welke and Phil Harris of Troppo, well deserved 2014 Australian Institute of Architects Gold Medallists, had this to say about minimum energy performance regulations: “…we pat ourselves on the back for tackling greenhouse gas emissions with approval frameworks that are predicated on the inclusion of energy-heavy air-conditioning. A sealed, insulated box – an esky – becomes the ultimate energy efficient building paradigm. Come on… the emperor’s turned up in the nude again!”
As an examination of the submissions to the Queensland Parliamentary Inquiry into Energy Efficiency reveals, Welke and Harris were voicing concerns held by many tropical housing design practitioners in relation to the Nationwide House Energy Rating Scheme (NatHERS) tools1. NatHERS tools simulate the temperatures inside a house using a full year of hourly weather data and the heat needed to be added or extracted to maintain comfortable temperatures i.e. heating and cooling. There are 69 Australian climate zones with this data available. To rate a house, the tools extract or add heat in the simulated house until a comfortable temperature is achieved. The amount of energy required to do this will determine the house’s energy rating.
Contrary to what many practitioners believe, though, new research has shown that Nationwide House Energy Rating Scheme (NatHERS) tools do not assume a sealed box, nor do they assume heavy use of cooling. A report I completed in 2012 for what is now the Department of Industry examined how NatHERS rating tools work in hot climates2. The analysis showed the NatHERS tools assume that ventilation is used to make the house feel cooler by opening windows much more than they close windows and artificially cool the house. Second generation tools, introduced in 2006, simulate the internal wind speed in a house and the additional comfort this provides. Before extracting heat to make the house cooler, these newer NatHERS tools will first open windows to see if this makes the house comfortable. They only extract heat if ventilation is not adequate to maintain comfort. NatHERS tools assume that heating and cooling is available from 7am to midnight in living areas and from 4pm to 9am in bedroom areas. While overnight heating thermostats are lower than daytime thermostats, overnight cooling thermostats are the same as daytime thermostats.
Typical tropical house design strategies like deep verandas, louvre windows and light colours all led to significant improvements in NatHERS star ratings in climates where cooling loads are greater than heating loads.
In houses designed for the tropics I evaluated in Darwin, the tools assume that windows are opened annually for around 66% of hours (i.e. average 16 hours a day) and the house is artificially cooled to achieve comfort 16% of the time (4 hours), which is comparable with reported hours of cooling use in Darwin. In a Brisbane house that I evaluated, windows were opened for, on average, 11 hours a day and it was artificially cooled for half an hour. This report also showed that the comfort benefit due to air movement predicted by NatHERS tools was 50% higher in a house designed to promote cross ventilation (elevated, windows on opposite sides of all rooms) than in a typical volume market house. Maybe it should be even better, but it is showing a significant benefit. Further, typical tropical house design strategies like deep verandas, louvre windows and light colours all led to significant improvements in NatHERS star ratings in climates where cooling loads are greater than heating loads. This shows NatHERS tools do not assume a sealed box. With this level of use of ventilation, the emperor must at least be wearing his speedos.
So if all this is working correctly, why are experts so dissatisfied with the rating? One contributing factor may be that the better performance of bedrooms in traditional tropical houses isn’t being rewarded by the rating. In NatHERS tools, bedroom cooling loads are much lower than living room loads because they mainly cool overnight when outdoor temperatures are cooler and there is no sun. Bedroom cooling loads can be as low as only 12% of the total and are generally around 25%. As a result, their performance doesn’t have much impact on the star rating. NatHERS tools assume that the overnight cooling thermostat temperature in bedrooms is the same as the daytime thermostat. At night the body is insulated from heat loss by the bed, so comfort theory would support a lower thermostat temperature in bedrooms. Lowering the overnight bedroom cooling thermostat increases predicted energy loads in bedrooms. This would ensure that bedroom performance is better valued by NatHERS tools. The rating of a traditional tropical design with well-ventilated bedrooms would be at least a star higher compared to volume market houses if the NatHERS tools used a three degree lower overnight thermostat.
In reality, it is the relationship between architect and client and their design process that NatHERS tools can’t address.
While further research is needed into how much lower the thermostat should be, the report I prepared for the Department of Industry recommended the use of lower overnight cooling thermostats. It may not be the only solution, but it will help. I would agree with the general sentiment of Welke and Harris’ comments, though because there is a limit to what can be assessed by NatHERS tools. Even if NatHERS is modified to better reward traditional tropical design techniques, there will be some specialist tropical houses that will never receive a good rating. Houses that are essentially no more than a set of permeable screens used to enclose spaces for living will never do well under NatHERS. Predicted cooling loads from NatHERS tools will always be high in such buildings because they let too much hot and moist air in. The temperatures in these houses are easy to simulate: outdoor air temperature minus an allowance for air movement. These houses are designed to match the comfort needs of the occupants – people who, as Phil and Adrian suggested, will “get out a beer” on those 60 uncomfortable days each year.
In reality, it is the relationship between architect and client and their design process that NatHERS tools can’t address. If occupants of lightly enclosed houses never use cooling appliances, regardless of their NatHERS rating, then they are meeting the policy objectives of the regulations. There is a reasonable argument that we need a formalised alternative solution compliance path for such houses in the tropics within the National Construction Code (NCC). My only concerns would be to ensure that:
For most Australians, however, a beer is not all they need in hot weather. Over 70% of Australian houses have air-conditioning installed. In the Northern Territory, over 90% have air conditioning and half of all houses have three or more air conditioners. I’m sure that air conditioning ownership would be less if there were more Troppo houses – but it wouldn’t be 0% either. Furthermore, continued global warming will only see increased use of air conditioning, so we need a regulatory approach like NatHERS that minimises heat gain and facilitates heat loss for conventional houses in hot climates.
- This doesn’t create a loophole for volume market houses – which will be air-conditioned – to get away with lower standards.
- The alternative solution is suitably robust – such houses should never be allowed to be air-conditioned without bringing the fabric up to an appropriate standard, although this would be hard to enforce.
- The alternative solution should be rigorous – it needs to have quantifiable criteria to ensure that the design will actually deliver the comfort it promises.
- Occupants need to understand what level of comfort they are getting – monitoring of naturally cooled houses shows that they can spend considerable time outside the conventional comfort zone in the hottest climates3. They are not for everyone, particularly those more sensitive to heat stress in the hottest climates.
NatHERS tools do not simulate a sealed box, and in fact pursue the use of ventilation aggressively as a solution to comfort. As I have said, the emperor is at least wearing speedos. And maybe, in a hot climate, that is all he needs – particularly if the NCC is modified to develop an alternative solution to deal with lightly enclosed houses, a condition that NatHERS was not designed to deal with.
CSIRO recently investigated whether a higher NatHERS star rating does in fact lead to lower energy use in hundreds of real houses located in Adelaide, Melbourne and Brisbane. While heating savings were even higher than NatHERS predicted, there were virtually no cooling savings associated with higher ratings. CSIRO threw some new light on these findings at a meeting I attended recently. It seems that the way in which higher ratings were achieved across the sample was to implement design changes that had a much greater impact on reducing heating loads than cooling loads. As a result the variation in cooling energy loads predicted by NatHERS across the sample was small and it is therefore not surprising that no cooling savings were associated with higher ratings. This points to another possible deficiency with the NatHERS scheme: it adds together heating and cooling loads and assigns a rating to the total. This means that in mixed climates, which have significant heating and cooling loads, you are not guaranteed to get lower cooling energy with a higher rating. The BASIX system in NSW sets a cap for both heating and cooling. Perhaps this is the way forward for NatHERS as well.
1. Queensland Parliament, 2010.“Energy Efficiency: Queensland’s First Energy Resource”, Report on the economic and environmental potential provided by energy efficiency improvements for households, communities, industry, and government, Report No.2 of the Environment and Resources Committee, 53rd Parliament, February 2010.
2. “Tropical validation study: an investigation into the impact of energy ratings on house design in hot climates for the department of climate change and energy efficiency prepared by tony isaacs consulting, with assistance from Michael Plunkett, Smartrate, and Ray Fogolyan”, Home Star Rating Australia, Canberra, 2012.
3. Soebarto, V. et al, “The performance of award winning houses”, PLEA2006 - The 23rd Conference on Passive and Low Energy Architecture, Geneva, Switzerland, 6-8 September 2006
Source : http://architectureau.com
Roca launches its first products as BIM objects
- There are now more than 50 products available in this first phase release
- By the end of 2015, the first part of the catalogue will be available on the BIMobject® Cloud as BIM objects
Roca, the world reference company for comprehensive bathroom products, will release their full range catalogue as BIM objects, thanks to the framework agreement with BIMobject®.
Since early 2014 Roca and BIMobject have been working with this project which will run throughout 2015 and beyond with the continued publishing on the BIMobject Cloud the full range catalogue of Roca products - more than one million of articles - as BIM objects, available and downloadable for professionals. Roca’s BIM objects are available as both, Revit and ArchiCAD.
A BIM object contains information that includes all relevant data regarding properties of a specific product designed and manufactured by a company. Within the collaborative working environment of BIM technology (Building Information Modeling), BIM objects can be downloaded from the BIMobject Cloud to integrate into any BIM software. This cooperation is to ensure that professionals in the sector have access to the most advanced tools when creating their projects. By downloading Roca’s BIM objects, planners will automatically have access to updated information. This will mean faster processes, lower risks and costs but with higher quality and a more efficient workflow.
Roca and BIMobject® signed a frame agreement last May, this reinforces the Spanish company’s commitment to help the AEC sector providing the most advanced tools to improve their work.
With this launch, Roca is the first major company in the bathroom sector firmly committed to BIM objects as a format. Today, BIM technology is accelerating in use by professionals all around the world because of the power of digital BIM collaborative work environment for the development and management of projects.
”We face this project around BIM objects as a challenge and a big opportunity at the same time. An exciting challenge because it meets our goal of trying to stay one step ahead on the market and a great opportunity to learn more about key technologies that will define the future of our industry.” says Carlos Velázquez, Corporate Marketing Director Roca Group
“Today, many people will be more than happy to get all these ROCA products as BIM objects for free. It’s been a fantastic learning process to work together with ROCA so far. People involved in this project inside ROCA have shown a high level of knowledge and understanding about what Information means in terms of BIM. More exciting content will come from the Roca and BIMobject partnership" says Mario Ortega, Managing Director of BIMobject in Spain.
Roca is a company specialising in the design, production and marketing of products for bathroom spaces as well as ceramic floorings and wall coverings used in architecture, construction and interior design.
Roca’s commercial network spreads over 135 countries supplied by its 77 production plants and 21.000 employees worldwide.
The wholly Spanish-owned group is market leader in Europe, Latin America, India and Russia. It is also a major market player in China and the rest of Asia, Africa and the Middle East. Roca is the worldwide leader in its business sector.
Source : http://www.mynewsdesk.com