Council archive · source document
9. BUSHFIRE ATTACK LEVEL REPORT v1 - NOOSA NORTHSHORE RETREAT · MCU19/0117
AUSTRALIAN STANDARD 3959:2018
CONSTRUCTION OF BUILDINGS IN BUSHFIRE-PRONE
AREAS
BUSHFIRE ATTACK LEVEL REPORT
DRAFT NOT FOR SUBMISSION PURPOSES
LOT 500 ON SP215779
90 BEACH ROAD,
NOOSA NORTH SHORE
FOR
SUNSHINE BEACH CONSTRUCTIONS PTY LTD
AUGUST 2019
The proposed dwelling is exposed to BAL Flame Zone in the absence of additional
vegetation management. It is recommended vegetation clearing be carried out to
achieve a minimum BAL 29 exposure.
PO Box 9566 Pacific Paradise QLD 4564
ABN 60 625 108 625
See the original
The page text is free to read. Viewing or downloading an original file needs an account.
Log in to see the originalFull text of the other 14 pages
Page 2
Bushfire Attack Level Report v1 NCES REF: J000436
Lot 500 on SP215779 – 90 Beach Road, Noosa North Shore
DOCUMENT CONTROL
Document: Bushfire Attack Level Report
Client: Sunshine Beach Constructions Pty Ltd
Project Number: J000436
Site: Lot 500 on SP215779
90 Beach Road, Noosa North Shore
File Ref: C:\CLIENTS\MARK BAIN CONSTRUCTIONS\NOOSA NORTHSHORE
RETREAT\2019 BA MCU\04_REPORTING\02_BAL REPORT\BUSHFIRE ATTACK
LEVEL REPORT v1 – NOOSA NORTHSHORE RETREAT.docx
DRAFT NOT FOR SUBMISSION PURPOSES
Version Date Distribution Author/s Approved
1 15/08/2019 Jack Lewis - Pivotal Nick Willis (B. Sc.) – Joshua Lee (B. Sc.) –
Perspective Principal Environmental Director
Scientist
DISCLAIMER
To the extent permitted by law, North Coast Environmental Services (including its employees, partners and consultants)
excludes all liability to any person for any consequences, including but not limited to all losses, damages, costs,
expenses, and any other compensation, arising directly or indirectly, from using this publication (in part or whole) and
any information or material contained in it.
© 2019 i
Page 3
Bushfire Attack Level Report v1 NCES REF: J000436
Lot 500 on SP215779 – 90 Beach Road, Noosa North Shore
TABLE OF CONTENTS
1.0 INTRODUCTION 1
2.0 DESKTOP MAPPING 1
2.1 NOOSA PLANNING SCHEME 2016 1
3.0 THE PROPOSED BUILDING APPLICATION 1
DRAFT NOT FOR SUBMISSION PURPOSES
4.0 SITE DESCRIPTION 2
4.1 GENERAL 2
4.2 VEGETATION 2
4.3 TOPOGRAPHY 3
5.0 AS 3959:2018 BAL ASSESSMENT 4
5.1 METHODOLOGY 4
5.2 RESULTS 5
5.3 VEGETATION MANAGEMENT TO REDUCE BAL RATING 5
6.0 CONCLUSION 6
7.0 REFERENCES 8
APPENDIX 1 – BUILDING PLANS 9
© 2019 ii
Page 4
Bushfire Attack Level Report v1 NCES REF: J000436
Lot 500 on SP215779 – 90 Beach Road, Noosa North Shore
1.0 INTRODUCTION
North Coast Environmental Services have been engaged to provide a Method 1 Bushfire Attack
Level Report in accordance with Australian Standard 3959:2018 Construction of buildings in
bushfire-prone areas. The Bushfire Attack Level (BAL) assessment was requested to assess the
National Construction Code construction requirements for a new dwelling to be constructed within
land formally described as Lot 500 on SP215779, located at 90 Beach Road, Noosa North Shore
(herein referred as ‘the site’).
2.0 DESKTOP MAPPING
DRAFT NOT FOR SUBMISSION PURPOSES
2.1 Noosa Planning Scheme 2016
The Bushfire Hazard Overlay Map of the Noosa Planning Scheme 2016 identifies the presence
of a Medium Potential Bushfire Intensity area and a Potential Impact Buffer area within the site
(refer to Plate 1). The proposed new dwelling is located within the Medium Potential Bushfire
Intensity area in the far south-west corner of the site.
Plate 1 – Noosa Plan Natural Hazards Overlay, Bushfire (Noosa Planning Scheme 2006)
3.0 THE PROPOSED BUILDING APPLICATION
The applicant seeks approval for a new dwelling (Visitor Accommodation) to be constructed in
the south-west corner of the site. The proposed new dwelling will be a two storey two-bedroom
home.
A Design Plan which identifies the location and design of the dwelling has been provided as
Appendix 1.
© 2019 1
Page 5
Bushfire Attack Level Report v1 NCES REF: J000436
Lot 500 on SP215779 – 90 Beach Road, Noosa North Shore
4.0 SITE DESCRIPTION
4.1 General
The site comprises an irregularly shaped allotment of approximately 14.5ha flanked by Beach
Road to the North and national park tenured land to the east and south. The existing facilities of
the Noosa Northshore Retreat are located in the westerly adjoining allotment which is
characterised by houses and internal access roads set within a densely vegetated area (refer to
Plate 2).
DRAFT NOT FOR SUBMISSION PURPOSES
Plate 2 – Local Conditions (Source: Queensland Globe)
4.2 Vegetation
The proposed new dwelling is flanked by vegetation which is assessable under AS 3959:2018 in
all directions. This vegetation is mapped under the Noosa Planning Scheme as a Medium
Bushfire Hazard Area (refer to Plate 1) and represents Type B Woodland under AS 3595:2018.
The Type B Woodland was observed to be dominated by Eucalyptus racemosa subsp. racemosa
(scribbly gum), with Corymbia trachyphloia (brown bloodwood) and C. intermedia (pink
bloodwood) subdominant and occasional Angophora leiocarpa (smooth-barked apple) and
Allocasuarina littoralis (black she-oak) to an average of 18m – 20m with projective foliage crown
cover of <30%. The understorey was dominated by a mid-dense association of native shrubs,
grasses and herbaceous species (refer to Plate 3).
© 2019 2
Page 6
Bushfire Attack Level Report v1 NCES REF: J000436
Lot 500 on SP215779 – 90 Beach Road, Noosa North Shore
DRAFT NOT FOR SUBMISSION PURPOSES
Plate 3 – Type B – Woodland vegetation associated with the Medium Bushfire Hazard Area
4.3 Topography
The assessable vegetation within 100m of the proposed building works is located downslope of
the proposed building works with an underlying slope of <5 degrees.
Plate 4 depicts topographic conditions within and adjacent to the site.
Plate 4 – Topography (Source: SCC Mymaps)
© 2019 3
Page 7
Bushfire Attack Level Report v1 NCES REF: J000436
Lot 500 on SP215779 – 90 Beach Road, Noosa North Shore
5.0 AS 3959:2018 BAL ASSESSMENT
AS 3959:2018 provides minimum construction requirements for assessable building works in
Designated Bushfire Prone Areas. Dwellings (and renovated parts of existing dwellings) in
Designated Bushfire Prone Areas must be built to the BAL construction standard relevant to the
dwelling as identified by AS 3959:2018.
5.1 Methodology
The BAL identified herein has been determined by using the simplified procedure described in
Clause 2.2 (Method 1) of the AS 3959:2018. Table 1 describes the steps used under AS
3959:2018 to determine the BAL.
Table 1 – Methodology
DRAFT NOT FOR SUBMISSION PURPOSES
Step Clause Procedure
1 2.2.2 Determine the relevant fire danger index.
2 2.2.3 Determine the classified vegetation type(s)
3 2.2.4 Determine the distance of the site from the classified vegetation type(s)
4 2.2.5 Determine the effective slope(s) under the classified vegetation type(s)
5 2.2.6 Determine the BAL from the appropriate table.
6 2.2.7 Determine the appropriate construction requirements.
Based on the conditions observed during the site inspection in July 2019, the following input data
was used to determine the BAL (refer to Table 2).
Table 2 – Input Data
Input Parameter Input Data
Fire Danger Index 50 (Leonard et al., 2014)
Vegetation Type Type B - Woodland
Distance of classified vegetation from 0m (no clearing proposed with the application)
building
Effective slope(s) under the classified Downslope >0 to 5 degrees
vegetation type
The potential AS 3959:2018 BAL’s acting on the dwelling based on the above conditions is
derived from Table 2.6 of AS 3959:2018.
© 2019 4
Page 8
Bushfire Attack Level Report v1 NCES REF: J000436
Lot 500 on SP215779 – 90 Beach Road, Noosa North Shore
DRAFT NOT FOR SUBMISSION PURPOSES
5.2 Results
Table 2.6 of AS 3959:2018 identifies the following setback distances between the proposed
building and assessable vegetation are required to achieve the various BAL build requirements:
• BAL Flame Zone – <9m
• BAL 40 – 9m – <12m
• BAL 29 – 12m – <18m
• BAL 19 – 18m – <26m
• BAL 12.5 – 26m – <100
5.3 Vegetation Management to Reduce BAL Rating
No clearing was nominated as part of the scope of our assessment and therefore the building
would currently trigger BAL Flame Zone given its position amongst Type B Woodland. Building
in BAL Flame Zone is undesirable and vegetation management (i.e. clearing) can increase
separation distances between the building and the adjacent hazardous vegetation thereby
providing the opportunity to lower the BAL acting on the building.
Due to the extensive amount of hazardous vegetation flanking the location of the proposed
dwelling, a minimum BAL 29 construction standard separation is recommended,, which is
consistent with Assessment Benchmark 3 - Bushfire, flood, landslide, storm tide inundation, and
erosion prone areas outside the coastal management district of the State Planning Policy – state
interest guidance material October 2018 Subclause 2 which states:
2. A bushfire defendable space is provided between buildings or building envelopes and
hazardous vegetation by a distance that achieves a radiant heat flux level at any point on
the building or envelope that does not exceed 29 kW/m². The bushfire defendable space
is to be contained wholly within the development site. The extent of bushfire defendable
space is to be established in accordance with – Detailed bushfire hazard assessment in
the Planning for Bushfire Resilient Communities document.
Therefore, a low threat Asset Protection Zone measuring no less than 12m in a linear plane
© 2019 5
Page 9
Bushfire Attack Level Report v1 NCES REF: J000436
Lot 500 on SP215779 – 90 Beach Road, Noosa North Shore
measured perpendicular to the building elevation would be required. Generic low threat
vegetation conditions are broadly defined in AS 3959:2018. Low hazard vegetation is defined in
the QLD SPP as vegetation with fuel loads of 8 t/ha or less and can include continuous tree cover
over short cropped grass (i.e. VHC 40.4 (Leonard and Opie 2017)).
As a general guide, vegetation management within the APZ should therefore comprise:
• Selective removal of large canopy trees (defined as >200mm diameter at breast height)
so that the expected mature crown drip line (i.e. outer perimeter of crown cover) of
remaining trees is separated by at least 4m from adjacent trees. This measure aims to
suppress the risk of a crown fire moving through the APZ. Smooth barked (i.e. flooded
gums) and fully barked canopy trees (i.e. Corymbia spp.) are to be retained in preference
to half barked species which exhibit high bark shredding characteristics such as
DRAFT NOT FOR SUBMISSION PURPOSES
Blackbutts. Rainforest canopy trees can be retained where present;
• Complete removal of all non-rainforest (i.e. eucalypt) recruitment canopy trees and mid
canopy trees <200mm diameter at breast height. Non-fire promoting rainforest species
can be retained;
• Complete removal of all non-rainforest shrub species;
• Complete clearing and mowing/brush cutting of the understorey and then maintenance of
a grassy groundcover height to less than 10cm. Discrete plantings of low flammability
groundcovers and shrubs is permissible at a distance >10m from the dwelling.
Note, the extent of clearing described above may require approval from Local, State and
Commonwealth authorities and any recommendations to undertake clearing herein do not
constitute an approval to do so in any shape or form.
6.0 CONCLUSION
The proposed building works located at 90 Beach Road, Noosa North Shore, currently trigger a
BAL Flame Zone construction requirement. Building in BAL Flame Zone is undesirable and
vegetation management (i.e. clearing) is recommended to increase separation distances
between the building and the adjacent hazardous vegetation thereby providing the opportunity to
lower the BAL acting on the building.
Due to the extensive amount of hazardous vegetation flanking the location of the proposed
dwelling, a minimum BAL 29 construction standard separation is recommended, which is
consistent with Assessment Benchmark 3 - Bushfire, flood, landslide, storm tide inundation, and
erosion prone areas outside the coastal management district of the State Planning Policy – state
interest guidance material October 2018
To achieve this outcome, the application should nominate the subject 12m wide APZ on the plan
of development so that it can be approved by Noosa Council.
Note, additional clearing applications may be required to be submitted to other the relevant
authorities (including Council, State and Commonwealth government – where applicable) to
satisfy legislative requirements (i.e. QLD Nature Conservation Act Protected Plants legislation).
BAL 29
A building assessed as being BAL—29 shall comply with Section 3 and Clauses 7.2 to 7.8 of AS
3959:2018.
NOTE: There are a number of Standards that specify requirements for construction; however,
where this Standard does not provide construction requirements for a particular element, the
other Standards apply.
Any element of construction or system that satisfies the test criteria of AS 1530.8.2 may be used
in lieu of the applicable requirements contained in Clauses 7.2 to 7.8 (see Clause 3.8).
NOTES:
BAL—29 is primarily concerned with protection from ember attack and radiant heat greater than
19 kW/m2 and up to and including 29 kW/m2.
© 2019 6
Page 10
Bushfire Attack Level Report v1 NCES REF: J000436
Lot 500 on SP215779 – 90 Beach Road, Noosa North Shore
All queries regarding building materials should be discussed with the architect and/or
building designer and confirmed to be compliant with the requirements of the AS
3959:2018 by a registered building certifier.
DRAFT NOT FOR SUBMISSION PURPOSES
© 2019 7
Page 11
Bushfire Attack Level Report v1 NCES REF: J000436
Lot 500 on SP215779 – 90 Beach Road, Noosa North Shore
7.0 REFERENCES
Standards Australia Committee FP-020, 2018. AS 3959:2018 Construction of buildings in
bushfire-prone areas. Standards Australia, Sydney NSW.
Leonard, J., Newnham, G., Opie, K., and Blanchi, R. (2014). A new methodology for state-wide
mapping of bushfire prone areas in Queensland. CSIRO, Australia.
DRAFT NOT FOR SUBMISSION PURPOSES
© 2019 8
Page 12
Bushfire Attack Level Report v1 NCES REF: J000436
Lot 500 on SP215779 – 90 Beach Road, Noosa North Shore
APPENDIX 1 – BUILDING PLANS
DRAFT NOT FOR SUBMISSION PURPOSES
© 2019 9
Page 13
19.0
0
19.0
27.0
28.0
26.0
10
18.0
26.0
20.0
17.0
30
26.0
25.0
21.0
10.0
50
24.0
16.0
13.0
15.0
14.0
proposed
23.0
22.0
dwelling
12.0
11.0
21.0
100m
20.0
DRAFT NOT FOR SUBMISSION PURPOSES
19.0
18.0
17.0
16.0
8.0
9.0
15.0
10.0
14.0
13.0
11.0
vegetation
protection 10m vegetation
Site boundary
zone buffer
12.0
12.0
PROPOSED Effluent disposal zone
LAGOON
11.0
10.0
12.0
9.0
8.0
8.0
11.0
8.0
ROAD
7.0
easement zone
10.0
existing tree
- retain
9.0
H
existing tree
BEAC
- remove
8.0
Site Masterplan -
N
7.0
Easement Option
6.0
service
Entry from Beach Road
access road
5.0
ABN 85 114 469 395 CONCEPT DESIGN Drawing Proj no.
N
O
4P
B56H
oQd0.73osaxealds
5P40857h8 Reg No 002195 New House Site Plan 1732
540F8571a8x 90 Beach Road, Noosa North Shore
scale date Dwg no.
Email [email protected] Client
Mark Bain 1:2000@A3 June '19 CD 1.01
Page 14
26650
5280 2000 2500 8211 1679 2000 4980
day bed day bed
day bed
DRAFT NOT FOR SUBMISSION PURPOSES
balcony balcony
bbq
Bed 01 Bed 02
Terrace 04
9800
Kitchen / Living
ensuite ensuite
roof below
stair
day bed
4680 4500 7790 3900 4590
TYPE C - FIRST FLOOR
153 m2 internal
55m2 terraces
ABN 85 114 469 395 CONCEPT DESIGN Drawing Proj no.
N
O
4P
B56H
oQd0.73osaxealds
5P40857h8 Reg No 002195 New House Plans 1732
540F8571a8x 90 Beach Road, Noosa North Shore
scale date Dwg no.
Email [email protected] Client
Mark Bain 1:100@A3 June '19 CD 2.04
Page 15
26650
5280 2000 2500 8211 1679 2000 4980
790
day bed day bed
day bed
day bed
Lounge terrace terrace
courtyard
02 03
5360
DRAFT NOT FOR SUBMISSION PURPOSES
Media room
terrace 01
9890
stair up bar / kitcheneete
bathroom
Games Room Bath Living
3760
laundry
bar
entry deck
bar / kitchenette
770
drying court
900 5190
6180 2490 2010 7790 3900 4590
boards
TYPE C - GROUND FLOOR
174 m2 internal
55m2 terrace
all terrain
golf cart 30m2 carport / entry store
ABN 85 114 469 395 CONCEPT DESIGN Drawing Proj no.
N
O
4P
B56H
oQd0.73osaxealds
5P40857h8 Reg No 002195 New House Plans 1732
540F8571a8x 90 Beach Road, Noosa North Shore
scale date Dwg no.
Email [email protected] Client
Mark Bain 1:100@A3 June '19 CD 2.03
Used in these records
9. BUSHFIRE ATTACK LEVEL REPORT v1 - NOOSA NORTHSHORE RETREAT.pdfRelated documentApplication case desk ↗
About this file
- File size
- 2.4 MB (large file)
- File type
No other editions are linked here.
Original file
Log in to download the original file
The download may take up to a minute.