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sustainability statement report Contents Wall assembly 2 Description 2 Thermal performance 3 Bushfire attack level 3 Recommendations 3 Part B Product 4 Description 4 Regulations 4 Environmental...

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sustainability statement report
Contents
Wall assembly    2
Description    2
Thermal performance    3
Bushfire attack level    3
Recommendations    3
Part B Product    4
Description    4
Regulations    4
Environmental sustainability    4
Use stage    4
End of life stage    4
Social sustainability    4
Economic sustainability    4
Eco-labels, third party certifications    4
Recommendations    4
References    4
Wall assembly
Description
*figure 1: insulation of framed walls with external cladding CSR, 2021
The selected wall assembly is a timber frame wall with weathe
oard cladding, 90 by 45 timber will be used as the studs, the insulation will fit between the studs and therefore be 90mm thick. The height of the insulation will be variable as the changing noggin height.
    Component
    Thickness
    Gyprock plus plaste
oard
    10mm
    Timber frame
    90mm
    Insulation
    90mm
    Bradford thermofoil
    10mm
    Weathe
oards
    16mm
    Total
    126mm
Thermal performance
The dwelling is located in Mallacoota, which is allocated to a climate zone 6. Under section XXXXXXXXXXexternal walls of the NCC in climate zone 6 they must achieve a minimum total R-value of 2.8.
According to the NCC in XXXXXXXXXXa) of the NCC XXXXXXXXXXweathe
oard external wall construction should have an R-value of 0.48. Therefore, the insulation will need to have increase the R value by 1.32 at a minimum Bradford gold wall batts provide an 2 value of 2.7 so will easily be enough to reach this requirement.
As specified in NCC 2019 volume 2 part XXXXXXXXXX , compliance may also be demonstrated by achieving a minimum 6 sta
efficiency rating, using a compliant softeware (firstrate5). The specified design has given a rating of 0.9 stars. Therefore the star rating of the design given does not comply with the national construction code or Australia. With the addition of the insulation it does increase the rating however still not enough to satisfy the NCCA.
The recommended wall assembly improves the heating and cooling demand. Although the values are still below where they need to be, there is still improvement with the added insulation.
Bushfire attack level
The wall of the design of a timber structure wall was assessed against the Australian standard 3959:2018 construction of buildings in bush-fire prone areas. The Bushfire attack level for the property is 12.5. this means that specific requirements must be taken, especially as the exterior of the house is weathe
oard which means that the house is enclosed in combustible material as a result as stated in XXXXXXXXXXb) of the Australian standard ‘timber logsof a density of 680 kg/m3 or greater at 12% moister content; of minimal nominal overall thickness of 90mm and a minimum thickness of 70mm. or bushfire resisting timber must be used such as sycon linea weathe
oards .
Recommendations
A wall assembly with insulation and with sycon linea weathe
oards, is the recommendation. This both improves the energy efficiency of the building but it also improves the bush fire resistance of the building too, this is important as the home is located in Mallacoota a bushfire prone area.
Part B Product
Description
Photo
Figure 2, classic weathe
oards 200mm, Subiaco 2021
Description
“weathertex is suitable for use in …. BAL-12.5 … construction levels” https:
www.weathertex.com.au/know-your-facts-on-our-safety/. Weathertex is made from hardwood timber and natural wax, some of their products are made from a range of other materials, the material works similarly to standard hardwood weathe
oards, they do have specific joiners that must be used with the weather boards to allow for expansion and contraction as well as to provide waterproofing for the cladding.
Production process
Weathertex’s production process begins with the timber, all resources except for the farming of the timber is done by weathertex, the process begins by mulching native hardwood trees. Once the timber is mulched it gets injected with high pressure steam, this works to prevent possible termite damage. This timber mulch is then refined further. Wheathertex then uses natural lignin to bond the fibers, making it have similar composition and durability to the original timber. These hard boards are then re-humidified to 8% moisture and planned down to 9.5 mm thinkeness. They can then be used for all of weathertex products - https:
www.sustainablebuildingawards.com.au/news/intelligent-manufacturing-weathertex-and-the-production-of-natural-timber-panels/#:~:text=The%20manufacturing%20process%20begins%20with,peace%20of%20mind%20for%20consumers.
Regulations
The National Code NCC 2019 Building Code of Australia – Volume Two references timber weathe
oard cladding, detailing the requirements for application of this particular cladding. These references are detailed in Figure 3.
    Clause/Table/Section
    Page
     XXXXXXXXXXDiagram b Flashing abutting a weathe
oard wall or similar cladding.
    193
     XXXXXXXXXXApplication of wall cladding for timber cladding, including weathe
oards and profiled boards.
    207
    Table XXXXXXXXXXFixing requirements – Splayed and profiled timber weathe
oards.
    208
     XXXXXXXXXXExternal wall construction
    376
    Figure XXXXXXXXXXa) Weathe
oard external wall construction – Total R-Value of 0.48.
    379
    Referenced Documents. AS XXXXXXXXXXConstruction of buildings in bushfire-prone areas. Volume One: G5.2. Volume Two: XXXXXXXXXX.
    530
Figure 3: Clauses in NCC 2019 Volume Two which are relevant to Timber weathe
oard
There are no standards on installation of external timber walls, however regulations and guidelines on external walls and their protection against fire hazards are covered in the following Australian Standards:
· AS XXXXXXXXXXClassification of external walls of buildings based on reaction-to-fire performance
· AS 3959 – 2018 Construction of buildings in bushfire-prone areas – “Provides essential information on construction methods for buildings that may be, or are subjected to, very low, low, moderate, high, very high and extreme bushfire attack level (BAL) categories” (SAI Global, 2011)
· AS XXXXXXXXXX – 2018 “Methods for fire tests on building materials, components and structures – Tests on elements of construction in buildings exposed to simulated bushfire attack – Radiant heat and small flaming sources” (SAI Global, 2011)
Weathe
oard cladding is covered in the following Australian Industry publications:
· CPCCCA3017A Install exterior cladding 2012, Australian Government Department of Education, Employment and Workplace Relations, training.gov.au/TrainingComponentFiles/CPC08/CPCCCA3017A_R1.pdf>
· Improving timber cladding for builders and designers 2007, Australian Government Forest and Wood Products Research and Development Corporation, www.fwpa.com.au/images/marketaccess/PN XXXXXXXXXXpdf>
Environmental sustainability
Environmental impacts of production
Timber is a renewable resource and widely used in the construction industry, in particular the domestic construction industry due to its ability to be able to be repurposed. Weathertex is incredibly renewable being made from this reusable resource, having a combination of “97% hardwood and 3% paraffin wax” (Weathertex, XXXXXXXXXXAs mentioned in ‘Improving timber cladding for builders and designers (2007)’, chemical usage in the weathe
oard making process can be an exercise which makes weathe
oard a less sustainable option. Weathertex ensures “polluting chemicals are required when making Weathertex products”, making for a sustainable production process with no toxic chemicals being utilised. this is one of reasons Weathertex is Greentag certified.
Environmental impacts of packaging
Weathertex furthers it’s renewable reputation by utilising resource recovery systems. This allows for “creating compost, using the offcut board as fuel, creating
iquettes and using it as packaging” (Weathertex, XXXXXXXXXXThis recycled packaging can be placed into recycling bins, minimising waste disposal.
Use stage
Maintenance
The most common maintenance issue of weathe
oard walls is that every 10-15 years, typically anew coat of paint is required to keep it’s external façade. However, paint professional such as Resene suggest paint re-application for timber weathe
oard every “7-10 years” (Resene.com.au). However, Weathertex claim there weathe
oard requires paint re-application every 15 years.
Durability
Weathe
oard is typically required to be maintained more so than other cladding types or external materials used for house, such as
ick. Temperature changes often cause expansion and contraction in the timber, resulting in chipping or cracking. However, Weathertex’s timber is “wa
anty tried and tested not to rot, split or crack for up to 25 years” (Weathertex, XXXXXXXXXXA 10-year wa
anty on their natural range of timber is provided to customers, further proving their belief in the durability of their product.
Environmental related impacts
As discussed, timber weathe
oard requires potential washing with a hose. This requires little to moderate amounts of water. Especially considering, washing is only required once boards are visibly and clearly dirty which usually occurs every few years.
Timber has to typically be sourced from harvesters, Weathertex ensures that their sourced timber is sourced in Australia so that ca
on emissions are reduced through transportation, as opposed to if their raw materials were to be sourced from overseas. Also, each harvester that is used for attaining raw materials must be “PEFC-certified” (Weathertex Sustainable Checklist, XXXXXXXXXXThis makes certain that there is miniscule environmental impact and depletion of resources, as policies such as exclusion of old growth hardwood being used.
End of life stage
Closely related to environmental related impacts as formerly discussed, is the ability of products to reduce their damage on the environment at the end of their life cycle. This is vital in producing an environmentally friendly product. Weathertex products can be dissembled for maintenance as required to ensure that the product’s life cycle is not shortened if alterations are required to maintain the product (Weathertex checklist). Additionally, Weathertex products can be recycled, reused or repurposed in different forms such as being recycled into packaging or turned into compost. Moreover, if the product were to eventuate in landfill it will not
eakdown or rot meaning the ca
on that exists within it will stay contained indefinitely (Weathertex checklist).
Social sustainability
Health-related impacts during production
Weathe
oard production involves the process of sourcing raw materials with the potential of containing harmful toxins as well as painting or staining the timber. Weathertex makes it clear to their customers that their production process in sourcing timber and staining materials is “s free from toxins and chemicals such as silicas, glues, resins and formaldehydes” (Weathertex Sustainable Checklist, 2020).
Health-related impacts during installation
The ability of the packaging to be reused is an important factor in this product being installed in a sustainable and renewable way as already detailed in this report. Also, the toxin and chemical free process in producing the product is applied to the install process as well, ensuring installers and nea
y people are not exposed to hazardous chemicals. NCC standards apply to installation of timber walls as mentioned in this report, and Weathertex vouches that they remain within the standards regarding safe installation guidelines (Weathertex Sustainable Checklist, 2020).
Health-related impacts during use phase
Research indicates that external walling is the most important variable element in residential construction (Treloar and Fay 2000) and can have a tremendous effect on a dwelling’s environmental impact. Weathe
oard was proven to withstand substantially better over other hardwood timbers when tested against termite infiltration (Weathertex information booklet). Thus, reducing the potential for termites to infiltrate a dwelling. This can partially be attributed to the removal of sugars and starch from the timber. Weathertex timber complies with NCC 2019 Volume 2 and AS XXXXXXXXXXregarding protection against fire-prone areas and upholds the necessary standards for the
Answered Same Day May 22, 2021 BUIL1241

Solution

Riddhi answered on May 22 2021
145 Votes
SUSTAINABILITY STATEMENT REPORT
SUSTAINABILITY STATEMENT REPORT
Structures and Materials
Wall Assembly -
The selected wall assembly is a timber space with specifications mentioned on the right-hand side
As per NCC 2019, the compliance requires minimum efficiency rating of 6, but the specified design has rating of 0.6 and hence do not comply with NCCA.
The recommended wall assembly shall improve the demand of heating and cooling and there is possible improvement in insulation
The design of the wall assessed against Australian standards of 3959:2018 in prone areas of bush fire where the level of bush fire attack was 12.5.
    Component     Thickness
    Gyprock plus plaste
oard     10mm
    Timber frame     90mm
    Insulation     90mm
    Bradford thermofoil     10mm
    Weathe
oards     16mm
    Total     126mm
Regulations
The regulation are for protection against hazards like Fire which are covered in Australian Standards.
There are some publications for wate
oard Cladding which are as follows –
Publication on installation of exterior cladding 2012, Australian Government Department of Education, Employment and Workplace Relations, CPCCCA3017A
Publication on Improvement of timber cladding for builders and designers 2007, Australian Government Forest and Wood Products Research and Development Corporation.
    Australian Standard    Particulars
    AS 5113 – 2016    External walls of buildings classification...
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