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Bushfire
GMA Certification Group Pty Ltd T/A Geoff Mitchell & Associates ACN 104 855 110 BUILDING SURVEYORS CERTIFICATION GROUP PTY LTO. SUNSHINE COAST OFFICE CLIENT: MEGAN WILLIAM PHONE 07 5449 0383 FAX 07 5449 0483 SITE ADDRESS: LOT 8 EUGELLA DRIVE Teale Avene TEWANTIN QLD 4565 POSTAL SUBURB: BLACK MOUNTAIN P/CODE: PO Box 1452 NOOSAVILLE BC QLD 4566 E-Mail RPD: Lot: 8 RP/SP: [email protected] = —_—_—_—_—_—_—_—_—_— Web www.geoffmitchell,com.au Site Bushfire Attack Assessment 1.0 Introduction The assessment of the proposed site is carried out to determine the category of bushfire attack in accordance with Australian Standard AS 3959-1999 Construction of Buildings in Bushfire-Prone Areas. The site has been identified as being in a bushfire risk area via town plan mapping. Although the town plan does not contain construction requirements for bushfire prone areas the requirements contained in the Building Code of Australia (BCA) Volume 2 are triggered. Categories of bushfire attack are determined so that the appropriate vegetation separation distances and levels of bushfire construction can be applied to the particular site/ proposed building works. Extreme levels of attack (i.e. greater than those designated as ‘high’) are outside the scope of AS 3959-1999 and, therefore specific design and construction requirements should be provided to meet Performance Requirement P2.3.4 of the BCA Volume 2. For the category of ‘low’ bushfire attack, the degree of bushfire attack is considered insufficient to warrant specific construction requirements. 2.0 Procedure When assessing the site to determine the vegetation separation distances and level of construction required the following AS 3959-199 Section 2 procedure was followed: a) Determine the vegetation separation distance, type and class, as follows: i) Identify all vegetation in each direction from the Site for a distance of 350 metres: ii) Consult Figure 2.1 (AS3959) copy attached to determine the vegetation type which predominates; and iii) Select the Predominant Vegetation Class (A to F) as described in Clause 2.2.2. b) Determine the Separation Distance between the Predominant Vegetation Class and the Site as described in Clause 2.2.3. GOLD COAST OFFICE WESTERN REGION OFFICE PHONE 07 5578 1622 PHONE 07 4742 2022 FAX 07 5596 1294 FAX 07 4742 2033 Suite 26 “Advance POSTAL 42B Ramsay St POSTAL Business Centre” PO Box 2760 CLONCURRY QLD 4824 — PO Box 557 39-47 Lawrence Drive NERANG QLD 4211 CLONCURRY QLD 4824 NERANG QLD 4211
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GMA Certification Group Pty Ltd c) Determine the average slope of the land between the Predominant Vegetation Class and the Site as described in Clause 2.2.4. d) Consult Table 2.1 (AS 3959) copy attached and determine the Category of Bushfire attack. 2.01 Predominant Vegetation Class Referencing AS 3959-1999 classify the vegetation in each direction as falling within the following Clause 2.2.2 classes: a) Class A, forest Trees — low , medium and tall, foliage cover greater than 30% in accordance with Figure 2.1, [A] Types. (1),(2), (4), (5), (8), (9). b) Class B, woodland Trees — low, medium and tall, foliage cover less than 30% in accordance with Figure 2.1, [B] Types, (3), (6), (10). c) Class C, tall shrubs Shrub and heath — tall, foliage cover 30% or more, in accordance with Figure 2.1, [C] Types, (12), (13). (14). d) Class D, low shrubs Shrubland — low foliage cover less than 30%, in accordance with Figure 2.1, [D] Types, (16), (17), (18), (19). e) Class E, open woodland and open shrubland Trees — low and medium foliage cover less than 10%, in accordance with Figure 2.1, [E] Types. (7), (11). (15). f) Class F, grassland All grasses and herbaceous plants, in accordance with Figure 2.1, [F] Types, (20) to (28). 2.02 Distance from vegetation Determine the distance between the Site and the Predominant Vegetation Class in each direction in terms of the following classes in accordance with clause 2.2.3: a) Less than 15 metres (m). b) 15 to 40m. c) Greater than 40 m to 100 m. d) Greater than 100 m. 2.03 Slope Determine the Site Slope in each direction in accordance with Clause 2.2.4 in terms of: a) Greater than 10°, or GOLD COAST OFFICE WESTERN REGION OFFICE PHONE 07 5578 1622 PHONE 07 4742 2022 FAX 07 5596 1294 FAX 07 4742 2033 Suite 26 "Advance POSTAL 42B Ramsay St POSTAL Business Centro” PO Box 2760 CLONCURRY QLD 4824 PO Box 557 39-47 Lawrence Drive NERANG QLD 4211 CLONCURRY QLD 4824 NERANG QLD 4211 2 0f 5
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GMA Certification Group Pty Ltd
b) 10° or less.
TABLE
2.1
DETERMINATION OF CATEGORY OF BUSHFIRE ATTACK FOR A SITE
Disesnce of the sire from Predomicanr Veneracion Claas
te 1F-ih= o40- 100m +100 =
Siepe =10" Lo" =e" 1e* >18* 20° =1o" 10°
or lest ar lets oo lesz or ler
I a a a
sedemerent oteeree Cae a2° Categorie: of bushfire arcack
ee Fipere 1.3)
fe Foreat (10 (2904105) 08) 199 bed Med Lew Law
Weordived (305) (10) Med Low Lew Low
TalS shrradre (3 Med Law Low Low
Levw abruke (1S) (LTC C1) Low Lew Lew Leow
pee weesdbered £70914
Ez hbed Med Low Low Low Lew Lew Lew
Opes alrublend (154
F CPownaloeed (20) te (28) Med law Low low lier Law Lew Low
NOTE Eat repeeeents the extrene categeey ef buchfire altwck which ia wstande ef the aeope of this Standard,
GOLD COAST OFFICE
PHONE 07 5578 1622
FAX 07 5596 1294
Suite 26 “Advance POSTAL
Business Contre” PO Box 2760
39-47 Lawrence Drive NERANG QLO 4211
NERANG QLD 4211
WESTERN REGION OFFICE
PHONE 07 4742 2022
FAX 07 4742 2033
42B Ramsay St POSTAL
CLONCURRY QLD 4824 PO Box 557
CLONCURRY QLD 4824
3 of §
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GMA Certification Group Pty Ltd
PROPURE €EY TG THE SAUL FIG OF ALSTON AN WEG ATION
FOO CONTE OF TAIT ee
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a
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—
F|GURE 2.1 PREDOMINANT VEGETATION TYPES AND CLASS TYPES 1 TO 26 AND
CLASSES ATOF
GOLD COAST OFFICE WESTERN REGION OFFICE
PHONE 07 8578 1622 PHONE 07 4742 2022
FAX 07 5596 1294 FAX 07 4742 2033
Suite 26 “Advance POSTAL 42B Ramsay St POSTAL
Business Centre” PO Box 2760 CLONCURRY QLD 4824 = PO Box 557
39-47 Lawrence Drive NERANG QLD 4211 CLONCURRY QLD 4824
NERANG QLO 4211
40f5
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GMA Certification Group Pty Ltd 3.0 Site Bushfire Attack Category Assessment Table 3 shows the results of the site inspection which determined the separation distance of the predominant vegetation class and type in each direction. The Category of Bushfire Attack will be derived from the worst case scenario for the proposed site. Table 3 Site Address: Site Slope & Separation Distance of the Site from the Predominant Vegetation Class Direction <15m 15 to 40 m >40 m to 100 m >100 m Slope (>10° or <10° >10° >10° >10° <10°) Location Predominant Vegetation Class & Type North 28 9 12 or8 8 South 28 8 12 or 8 12 or 8 East 28 9 12 or8 12 or 8 West 28 28 28 28 Determination of Category of LOW HIGH MED LOW Bushfire Attack for Site Category of Site Bushfire Attack Result: Predominant Vegetation Class A.C Level 2 Construction Required 4.0 Level of Building Construction Required. The results of Part 3 Site Bushfire Attack Category Assessment have determined that Level .2 Construction is required for the proposed site. Section 3 of AS 3959 sets out the construction requirements of various elements of the building in order to reduce the likelihood of ignition of the building when subjected to bushfire attack. GOLD COAST OFFICE WESTERN REGION OFFICE PHONE 07 5578 1622 PHONE 07 4742 2022 FAX 07 5596 1294 FAX 07 4742 2033 Suite 26 “Advance POSTAL 42B Ramsay St POSTAL Business Centre” PO Box 2760 CLONCURRY QLD 4824 PO Box 557 39-47 Lawrence Drive NERANG QLD 4211 CLONCURRY QLD 4824 NERANG QLD 4211 5 of 5