b'Part G5 Bushfire AreasBuildings in a designated bushfire prone area must be designedThere are 6 levels relating to the intensity of radiant heat exposure:and constructed to reduce the risk of ignition from a bushfire. Appropriate material selection considers the potential for ignitionBAL LOWNo construction requirementscaused by burning embers, radiant heat or flame generated byBAL 12.5 (kW/m2)Lowa bushfire and the intensity of the bushfire attack. AS 3959BAL 19 (kW/m2)ModerateprovidestheassessmentcriteriatodeterminetheBushfireBAL 29 (kW/m2)HighAttack Level (BAL) requirements attributed to components ofBAL 40 (kW/m2)Very higha construction. This takes into account (with local and stateBAL FZExtremevariations) several criteria such as ground slope, vegetation type and density.With regards to external timber cladding compliance, the following requirements apply in accordance with AS 3959 for each BALclassification. Note: the requirements in the table are in addition to General construction design requirements detailed in AS 3959.Timber Weatherboards and Architectural Panels as External Wall CladdingClassification 400mm from ground, deck, roof, awning or similar =400mm from ground, deck, roof, awning or similarBAL LOW No requirements No requirementsBAL 12.5 5.4.1 External walls shall be of (d) a timber No requirementsspecies as specified in Appendix EBAL 19 6.4.1 External walls shall be of (d) a timber No requirementsspecies as specified in Appendix EBAL 29 7.4.1 External walls shall be of (b)(iii) bushfire-resisting7.4.1 External walls shall be of (b)(iii) timber in Appendix F bushfire-resisting timber in Appendix F8.4.1 External walls shall be (a) made from8.4.1 External walls shall be (a) made from BAL 40 non-combustible material or (c) a systemnon-combustible material or (c) a system complying with AS 1530.8.1 complying with AS 1522.214.171.124.1 External walls shall be (a) made from 9.4.1 External walls shall be (a) made from BAL FZnon-combustible material of 90mm minimumnon-combustible material of 90mm minimum thickness or (b) a system complying withthickness or (b) a system complying with AS AS 1530.8.2 when tested from the outside 1530.8.2 when tested from the outsideBAL 12.5 and BAL 19 referencesClause E1 of Appendix ETimber in whole or reconstituted form with a density of 750kg/m3 or greater at a 12% moisture content is suitable for construction where specified in Sections 5 and 6 (i.e. BAL 12.5 and BAL 19). Table E1 lists examples of suitable timber species and densities not listed in Table E1 may be found in AS 1720.2.BAL 29 referencesClause F1 of Appendix FBushfire-resisting timber products which have been impregnated with fire-retardants or applied with fire-retarding coatings can be deemed acceptable to withstand BAL 29 exposure when tested in accordance with AS/NZS 3837 and accelerated weathering treatment of AS 1684.2. Clause F4 lists several timber species which have been tested as compliant. Other timber products when exposed to an irradiance level of 25 kW/m2, must achieve a maximum heat release rate of 100 kW/m2 and an average heat release rate for 10 minutes not greater than 60 kW/m2.BAL 40 and BAL FZ requirements:Generally, the requirements of BAL 40 and BAL FZ conditions are not able to be met by combustible timber cladding products.Weathertex|10'