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Part 3.7.1 Fire Separation

Appropriate Performance Requirements:

Where an alternative fire separation design is proposed as a Open link in same pagePerformance Solution to that described in Open link in same pagePart 3.7.1, that proposal must comply with—

  1. Performance Requirement Open link in same pageP2.3.1 ; and
  2. the relevant Open link in same pagePerformance Requirements determined in accordance with Open link in same page1.0.7.

Acceptable construction practice

3.7.1.1 Application

Compliance with this acceptable construction practice satisfies Open link in same pagePerformance Requirement Open link in same pageP2.3.1 for fire separation.

3.7.1.2 General concession — non-combustible materials

The following materials, though Open link in same pagecombustible or containing Open link in same pagecombustible fibres, may be used wherever a Open link in same pagenon-combustible material is Open link in same pagerequired in the Open link in same pageHousing Provisions

(a)

plasterboard; and

(b)

perforated gypsum lath with a normal paper finish; and

(c)

fibrous-plaster sheet; and

(d)

fibre-reinforced cement sheeting; and

(e)

pre-finished metal sheeting having a Open link in same pagecombustible surface finish not exceeding 1 mm thick and where the Open link in same pageSpread-of-Flame Index of the product is not more than 0; and

(f)

bonded laminated materials where—

(i)

each laminate is Open link in same pagenon-combustible; and

(ii)

each adhesive layer is not more than 1 mm thick; and

(iii)

the total thickness of adhesive layers is not more than 2 mm; and

(iv)

the Open link in same pageSpread-of-Flame Index and the Open link in same pageSmoke-Developed Index of the laminated material as a whole does not exceed 0 and 3 respectively.

3.7.1.3 External walls of Class 1 buildings

An Open link in same pageexternal wall of a Class 1 building, and any openings in that wall, must comply with Open link in same page3.7.1.5 if the wall is less than—

(a)

900 mm from an allotment boundary other than the boundary adjoining a road alignment or other public space; or

(b)

1.8 m from another building on the same allotment other than an appurtenant Class 10 building or a detached part of the same Class 1 building.

State and Territory Variations

In South Australia delete 3.7.1.3(b) and insert SA 3.7.1.3(b) and (c) as follows:

(b)

1.8 m from another building on the same allotment other than an appurtenant Class 10 building or a detached part of the same Class 1 building; or

(c)

3 m from a brush fence.

3.7.1.4 Measurement of distances

(a)

The distance from any point on an Open link in same pageexternal wall of a building to an allotment boundary or another building is the distance to that point measured along a line at right angles from the allotment boundary or Open link in same pageexternal wall of the other building which intersects that point without being obstructed by a wall complying with Open link in same page3.7.1.5.

(b)

Where a wall within a specified distance is Open link in same pagerequired to be constructed in a certain manner, only that part of the wall (including any openings) within the specified distance need be constructed in that manner.

(see Open link in same pageFigure 3.7.1.1 and Open link in same page3.7.1.2a)

(c)

Where the distance measured is between buildings of different heights, the distance must be taken from the Open link in same pageexternal wall with the highest elevation measured at right angles to a point that intersects a vertical projection above the adjacent wall (see Open link in same pageFigure 3.7.1.2b).

STATE AND TERRITORY VARIATIONS

In South Australia after 3.7.1.4(c) insert SA 3.7.1.4(d) as follows:

(d)

The distance from any point on an external wall of a building to a brush fence is measured in any direction from the Open link in same pageexternal wall.

Figure 3.7.1.1

WALLS AT RIGHT ANGLES TO THE BOUNDARY

Notes:
  1. No protection Open link in same pagerequired for the wall at right angles or more to the boundary.
  2. For protection of encroachments refer Open link in same page3.7.1.7.
Show Full Sized ImageFigure 3.7.1.1 WALLS AT RIGHT ANGLES TO THE BOUNDARY

 

Figure 3.7.1.2a

MEASUREMENT OF DISTANCES (Plan view)

Diagram a. Full wall protection
Show Full Sized ImageFigure 3.7.1.2 MEASUREMENT OF DISTANCES (Plan view)
Diagram b. Part walls protection
Show Full Sized ImageFigure 3.7.1.2 MEASUREMENT OF DISTANCES (Plan view)
Note: Setback distance is measured at right angles to the boundary.

 

Figure 3.7.1.2b

MEASUREMENT OF DISTANCE — BUILDINGS OF DIFFERENT HEIGHTS

Class 1 buildings on same allotment
Show Full Sized ImageFigure 3.7.1.2 MEASUREMENT OF DISTANCES (Plan view)

3.7.1.5 Construction of external walls

(a)

External walls (including gables) Open link in same pagerequired to be Open link in same pagefire-resisting (referred to in Open link in same page3.7.1.3 or Open link in same page3.7.1.6) must extend to the underside of a Open link in same pagenon-combustible roof covering or Open link in same pagenon-combustible eaves lining (See Open link in same pageFigure 3.7.1.3) and must—

(i)

have an FRL of not less than 60/60/60 when tested from the outside; or

(ii)

be of masonry-veneer construction in which the external masonry veneer is not less than 90 mm thick; or

(iii)

be of masonry construction not less than 90 mm thick.

Explanatory information:

The intent of the typical construction details shown in Open link in same pageFigure 3.7.1.3 is to ensure that combustible materials (external or internal) are not directly exposed to fire at the junction of the wall and non-combustible roof, eaves lining, guttering and the like. Other forms of construction may also be acceptable provided that they achieve this intent.

See Open link in same pageFigure 3.7.1.10 and Open link in same page3.8.6.3 for internal Open link in same pageseparating wall construction under one common roof.

(b)

Openings in Open link in same pageexternal walls Open link in same pagerequired to be Open link in same pagefire-resisting (referred to in Open link in same page3.7.1.3 or Open link in same page3.7.1.6) must be protected by—

(i)

non-openable fire Open link in same pagewindows or other construction with an FRL of not less than –/60/–; or

(ii)

Open link in same pageself-closing solid core doors not less than 35 mm thick.

(c)

Subfloor vents, roof vents, weepholes, control joints, construction joints and penetrations for pipes, conduits and the like need not comply with Open link in same page(b).

(d)

Concessions for non-Open link in same pagehabitable room Open link in same pagewindows.

Despite the requirements in Open link in same page(b), in a non-Open link in same pagehabitable room, a Open link in same pagewindow that faces the boundary of an adjoining allotment may be not less than 600 mm from that boundary or, where the Open link in same pagewindow faces another building on the same allotment, not less than 1200 mm from that building provided that—

(i)

in a bathroom, laundry or toilet, the opening has an area of not more than 1.2 m2; or

(ii)

in a room other than referred to in Open link in same page(i), the opening has an area of not more than 0.54 m2 and—

(A)

the Open link in same pagewindow is steel-framed, there are no opening sashes and it is glazed in wired glass; or

(B)

the opening is enclosed with translucent hollow glass blocks.

 

Figure 3.7.1.3

TYPICAL CONSTRUCTION OF EXTERNAL WALLS

Show Full Sized ImageFigure 3.7.1.3(a) TYPICAL CONSTRUCTION OF EXTERNAL WALLS

Notes:

  1. The Open link in same pageexternal wall is deemed to extend to the underside of Open link in same pagenon-combustible roof covering, or Open link in same pagenon-combustible eaves lining, when constructed as shown.
  2. Where sarking is installed it must be located so that ponding of water is avoided between the fascia and the first roofing batten.
  3. The location of flashing and framing is indicative only.

3.7.1.6 Class 10a buildings

(a)

Where a Class 10a building is located between a Class 1 building and the allotment boundary, other than the boundary adjoining a road alignment or other public space, the Class 1 building must be protected by one of the following methods shown in Open link in same pageFigure 3.7.1.4.

(b)

Where a Class 10a building is located between a Class 1 building to which it is appurtenant and another building on the same allotment, the Class 1 building must be protected by one of the methods shown in Open link in same pageFigure 3.7.1.5.

(c)

Where two or more Class 10a buildings on the same allotment are appurtenant to different Class 1 buildings, the Class 10a buildings must be separated in accordance with one of the methods shown in Open link in same pageFigure 3.7.1.6.

 

Figure 3.7.1.4

PROTECTION OF CLASS 1 BUILDINGS — CLASS 10a BETWEEN CLASS 1 AND THE ALLOTMENT BOUNDARY

Legend:

Show Full Sized ImageFigure 3.7.1.4 PROTECTION OF CLASS 1 BUILDINGS - CLASS 10a BETWEEN CLASS 1 AND THE ALLOTMENT BOUNDARY Wall with an FRL of 60/60/60 Show Full Sized ImageFigure 3.7.1.4 PROTECTION OF CLASS 1 BUILDINGS - CLASS 10a BETWEEN CLASS 1 AND THE ALLOTMENT BOUNDARY Allotment boundary
a. 900 mm from allotment boundary
The Class 10a building is not less than 900 mm from the allotment boundary, other than the boundary adjoining a road alignment or other public space. Show Full Sized ImageFigure 3.7.1.4a PROTECTION OF CLASS 1 BUILDINGS - CLASS 10a BETWEEN CLASS 1 AND THE ALLOTMENT BOUNDARY
b. Open link in same pageExternal wall to Class 10a building with FRL
An Open link in same pageexternal wall of the Class 10a building which is less than 900 mm from an allotment boundary, other than the boundary adjoining a road alignment or other public space, complies with Open link in same page3.7.1.5. Show Full Sized ImageFigure 3.7.1.4b PROTECTION OF CLASS 1 BUILDINGS - CLASS 10a BETWEEN CLASS 1 AND THE ALLOTMENT BOUNDARY
c. Open link in same pageExternal wall to Class 10a building with FRL
An Open link in same pageexternal wall of the Class 10a building which is less than 900 mm from the Class 1 building complies with Open link in same page3.7.1.5. Show Full Sized ImageFigure 3.7.1.4c PROTECTION OF CLASS 1 BUILDINGS - CLASS 10a BETWEEN CLASS 1 AND THE ALLOTMENT BOUNDARY
d. 900 mm separation between buildings
The Class 1 building is not less than 900 mm from the Class 10a building. Show Full Sized ImageFigure 3.7.1.4d PROTECTION OF CLASS 1 BUILDINGS - CLASS 10a BETWEEN CLASS 1 AND THE ALLOTMENT BOUNDARY
e. Class 1 building with FRL to Open link in same pageexternal wall
An Open link in same pageexternal wall of the Class 1 building which is less than 900 mm from the Class 10a building complies with Open link in same page3.7.1.5. Show Full Sized ImageFigure 3.7.1.4e PROTECTION OF CLASS 1 BUILDINGS - CLASS 10a BETWEEN CLASS 1 AND THE ALLOTMENT BOUNDARY

 

Figure 3.7.1.5

PROTECTION OF CLASS 1 BUILDINGS — CLASS 10a BETWEEN CLASS 1 AND OTHER BUILDINGS ON ALLOTMENT

Legend:

Show Full Sized ImageFigure 3.7.1.5 PROTECTION OF CLASS 1 BUILDINGS - CLASS 10a BETWEEN CLASS 1 AND OTHER BUILDINGS ON ALLOTMENT Wall with an FRL of 60/60/60 Show Full Sized ImageFigure 3.7.1.5 PROTECTION OF CLASS 1 BUILDINGS - CLASS 10a BETWEEN CLASS 1 AND OTHER BUILDINGS ON ALLOTMENT Other Class of building on allotment
a. 1.8 m from other building on allotment
The Class 10a building is not less than 1.8 m from the other building. Show Full Sized ImageFigure 3.7.1.5a PROTECTION OF CLASS 1 BUILDINGS - CLASS 10a BETWEEN CLASS 1 AND OTHER BUILDINGS ON ALLOTMENT
b. Open link in same pageExternal wall to Class 10a building with FRL
An Open link in same pageexternal wall of the Class 10a building which is less than 1.8 m from the other building complies with Open link in same page3.7.1.5. Show Full Sized ImageFigure 3.7.1.5b PROTECTION OF CLASS 1 BUILDINGS - CLASS 10a BETWEEN CLASS 1 AND OTHER BUILDINGS ON ALLOTMENT
c. Open link in same pageExternal wall to Class 10a building with FRL
An Open link in same pageexternal wall of the Class 10a building which is less than 1.8 m from the Class 1 building complies with Open link in same page3.7.1.5. Show Full Sized ImageFigure 3.7.1.5c PROTECTION OF CLASS 1 BUILDINGS - CLASS 10a BETWEEN CLASS 1 AND OTHER BUILDINGS ON ALLOTMENT
d. 1.8 m separation between Class 1 and 10a
The Class 1 building is not less than 1.8 m from the Class 10a building. Show Full Sized ImageFigure 3.7.1.5d PROTECTION OF CLASS 1 BUILDINGS - CLASS 10a BETWEEN CLASS 1 AND OTHER BUILDINGS ON ALLOTMENT
e. Class 1 building with FRL to Open link in same pageexternal wall
An Open link in same pageexternal wall of the Class 1 building which is less than 1.8 m from the Class 10a building complies with Open link in same page3.7.1.5. Show Full Sized ImageFigure 3.7.1.5e PROTECTION OF CLASS 1 BUILDINGS - CLASS 10a BETWEEN CLASS 1 AND OTHER BUILDINGS ON ALLOTMENT

 

Figure 3.7.1.6

PROTECTION OF CLASS 1 BUILDINGS — SEPARATION OF CLASS 10a BUILDINGS ON AN ALLOTMENT

Legend: Show Full Sized ImageFigure 3.7.1.6 PROTECTION OF CLASS 1 BUILDINGS - SEPARATION OF CLASS 10a BUILDINGS ON AN ALLOTMENT Wall with a FRL of 60/60/60
a. 1.8 m between Class 10a buildings
Each 10a must be separated from each other by a distance of not less than 1.8 m. Show Full Sized ImageFigure 3.7.1.6a PROTECTION OF CLASS 1 BUILDINGS - SEPARATION OF CLASS 10a BUILDINGS ON AN ALLOTMENT
b. Open link in same pageExternal wall to Class 10a building with FRL
Each 10a must be separated from each other by Open link in same pageexternal walls complying with Open link in same page3.7.1.5. Show Full Sized ImageFigure 3.7.1.6b PROTECTION OF CLASS 1 BUILDINGS - SEPARATION OF CLASS 10a BUILDINGS ON AN ALLOTMENT
c. 900 mm separation between Class 10a and Class 1 buildings
Each 10a must be separated from each Class 1 building by a distance of not less than 900 mm. Show Full Sized ImageFigure 3.7.1.6c PROTECTION OF CLASS 1 BUILDINGS - SEPARATION OF CLASS 10a BUILDINGS ON AN ALLOTMENT
d. Open link in same pageExternal wall to Class 10a buildings with FRL
Each 10a must be separated from each Class 1 building by Open link in same pageexternal walls complying with Open link in same page3.7.1.5. Show Full Sized ImageFigure 3.7.1.6d PROTECTION OF CLASS 1 BUILDINGS - SEPARATION OF CLASS 10a BUILDINGS ON AN ALLOTMENT
e. Class 10a buildings with FRL to separating wall
Each 10a must be separated by a wall complying with Open link in same page3.7.1.8. Show Full Sized ImageFigure 3.7.1.6e PROTECTION OF CLASS 1 BUILDINGS - SEPARATION OF CLASS 10a BUILDINGS ON AN ALLOTMENT
(d)

A carport is exempt from Open link in same page(a), Open link in same page(b) and Open link in same page(c) if—

(i)

it has two or more sides open and not less than one third of its perimeter open and, for the purposes of this clause, a side is considered to be open if the roof covering adjacent to that side is not less than 500 mm from another building or allotment boundary; and

(ii)

it has a polycarbonate or Open link in same pagenon-combustible roof covering and any ceiling lining and wall cladding, including gables, is also Open link in same pagenon-combustible (see Open link in same pageFigure 3.7.1.7); and

 

Figure 3.7.1.7

IDENTIFYING AN OPEN CARPORT

Show Full Sized ImageFigure 3.7.1.7 - Identifying an open carport
(iii)

it does not provide direct vertical support to any part of the Class 1 building; and

(iv)

in the case where it has a common roof structure with the Class 1 building and the carport does not have a ceiling (see Open link in same pageFigure 3.7.1.8), the opening between the top of the wall of the Class 1 building and the underside of the roof covering is infilled with—

(B)

construction clad with Open link in same pagenon-combustible material on the carport side.

STATE AND TERRITORY VARIATIONS

In South Australia delete 3.7.1.6(d) and insert SA 3.7.1.6(d) as follows:

(d)

A carport or verandah is exempt from Open link in same page(a), Open link in same page(b) and Open link in same page(c) if—

(i)

it has—

(A)

two or more sides open and not less than one third of its perimeter open and, for the purpose of this clause, a side is considered to be open if the roof covering adjacent to that side is not less that 500 mm from another building or allotment boundary; or

(B)

any part of the Open link in same pageexternal wall of the Class 1 building located less than 2 m from the allotment boundary or less than 4 m from another Class 1 building on the same allotment is Open link in same pagefire-resisting to the underside of a Open link in same pagenon-combustible roof covering or to the underside of a Open link in same pagenon-combustible ceiling lining (see Open link in same pageFigures SA 3.7.1.7a, Open link in same pageSA 3.7.1.7b and Open link in same pageSA 3.7.1.7c); and 

 
(ii)

it has polycarbonate or Open link in same pagenon-combustible roof covering and any ceiling lining and wall cladding, including gables, is also Open link in same pagenon-combustible (see Open link in same pageFigure 3.7.1.7); and

(iii)

it does not provide direct vertical support to any part of the Class 1 building; and

(iv)

in the case where it has a common roof structure with the Class 1 building and the carport or verandah does not have a ceiling (see Open link in same pageFigure 3.7.1.8), the opening between the top of the wall of the Class 1 building and the underside of the roof covering is infilled with—

(A)

a Open link in same pagenon-combustible material; or

(B)

construction clad with Open link in same pagenon-combustible material on the carport or verandah side; and

(v)

in the case where two carports or verandahs have a common roof structure with two different Class 1 buildings and the carports or verandahs have a ceiling, the roof space or ceiling space between the top of the ceiling and the underside of the roof covering is infilled as follows—

(A)

vertically between the two Class 1 buildings and between the two appurtenant carports of verandahs in accordance with Open link in same pageSA 3.7.1.6(d)(iv) (see Open link in same pageFigure SA 3.7.1.7d); or

(B)

vertically between the two Class 1 buildings and between the two appurtenant carports or verandahs in accordance with SA 3.7.1.6(d)(iv), except that the construction must be clad with Open link in same pagenon-combustible materials on both sides and must not be crossed by timber or other Open link in same pagecombustible building elements except for roof battens with dimensions of 75 × 50 mm or less, roof Open link in same pagesarking-type material or a timber gutter board not less than 20 mm thick.

 

Figure SA 3.7.1.7a

Fire-resisting requirements for carports or verandahs without a ceiling

Show Full Sized ImageFigure SA 3.7.1.7a FIRE-RESISTING REQUIREMENTS FOR CARPORTS OR VERANDAHS WITHOUT A CEILING

 :

Figure SA 3.7.1.7b

Fire-resisting requirements for carports or verandahs with a non-combustible ceiling

Show Full Sized ImageFigure SA 3.7.1.7b FIRE-RESISTING REQUIREMENTS FOR CARPORTS OR VERANDAHS WITH A NON-COMBUSTIBLE CEILING

 

Figure SA 3.7.1.7c

Fire-resisting requirements for external walls in carports and verandahs that share a common roof space

Show Full Sized ImageFigure SA 3.7.1.7c FIRE-RESISTING REQUIREMENTS FOR EXTERNAL WALLS IN CARPORTS AND VERANDAHS THAT SHARE A COMMON ROOF SPACE

 

Figure SA 3.7.1.7d

Fire-resisting requirements for roof space openings in carports and verandahs with a ceiling that share a common roof space

Show Full Sized ImageFigure SA 3.7.1.7d FIRE-RESISTING REQUIREMENTS FOR ROOF SPACE OPENINGS IN CARPORTS AND VERANDAHS WITH A CEILING THAT SHARE A COMMON ROOF SPACE

Figure 3.7.1.8

REQUIREMENTS FOR NON-COMBUSTIBLE INFILL PANELS TO CARPORT

Show Full Sized ImageFigure 3.7.1.8 REQUIREMENTS FOR NON-COMBUSTIBLE INFILL PANELS TO CARPORT
(e)

Class 10a buildings must not significantly increase the risk of spread of fire between Class 2 to 9 buildings.

STATE AND TERRITORY VARIATIONS

In South Australia after 3.7.1.6(e) insert SA 3.7.1.6(f) and (g) as follows:

(f)

A carport or verandah may have timber posts and timber roof support beams regardless of the distance from the boundary.

(g)

A Class 10b Open link in same pagebrush fence must not be constructed within 3 m of a Class 1 building unless any part of the building within 3 m of the Open link in same pagebrush fence complies with the Open link in same pagefire-resisting requirements of Open link in same page3.7.1.3, Open link in same page3.7.1.4, Open link in same page3.7.1.5 and Open link in same page3.7.1.7.

3.7.1.7 Allowable encroachments

(a)

An encroachment is any construction between the Open link in same pageexternal wall of the building and the allotment boundary other than a boundary adjoining a road or other public space, or the Open link in same pageexternal walls of two buildings on the same allotment and relates to any Open link in same pageexternal wall of—

(i)

a Class 10a building Open link in same pagerequired to comply with Open link in same page3.7.1.5; or

(ii)

a Class 1 building.

(b)

The encroachments allowed within 900 mm of an allotment boundary or within 1.8 m of another building on the same allotment are—

(i)

fascias, gutters and downpipes; and

(iii)

flues, chimneys, pipes, domestic fuel tanks, cooling or heating appliances or other services; and

(iv)

light fittings, electricity or gas meters, aerials or antennas; and

(v)

pergolas, sun blinds or water tanks; and

(vi)

unroofed terraces, landings, steps and ramps, not more than 1 m in height.

(c)

Encroachments listed in Open link in same page(b)(i), if Open link in same pagecombustible, Open link in same page(b)(ii) and Open link in same page(b)(iii) must not be built within 450 mm of an allotment boundary nor be built within 900 mm of the Open link in same pageexternal wall or associated encroachments of another building on the same allotment (see Open link in same pageFigure 3.7.1.9).

Explanatory information:

A deck is not considered an unroofed terrace and is therefore not permitted as an allowable encroachment under Open link in same page3.7.1.7(b) whether Open link in same pagecombustible or not.

The term pergola is a reference to an unroofed structure.

STATE AND TERRITORY VARIATIONS

In South Australia delete 3.7.1.7 and insert SA 3.7.1.7 and Figure SA 3.7.1.9a as follows:

(a)

An encroachment is any construction between the Open link in same pageexternal wall of the building and the allotment boundary other than a boundary adjoining a road or other public space, between the Open link in same pageexternal wall of the building and a Open link in same pagebrush fence, or between the Open link in same pageexternal walls of two buildings on the same allotment and relates to any Open link in same pageexternal wall of—

(i)

a Class 10a building Open link in same pagerequired to comply with Open link in same page3.7.1.5; or

(ii)

a Class 1 building.

(b)

The encroachments allowed within 900 mm of an allotment boundary, within 1.8 m of another building on the same allotment or within 3 m of a Open link in same pagebrush fence are—

(i)

fascias, gutters, downpipes; and

(ii)

eaves with Open link in same pagenon-combustible roof cladding and Open link in same pagenon-combustible lining; and

(iii)

flues, chimneys, pipes, domestic fuel tanks, cooling or heating appliances or other services; and

(iv)

light fittings, electricity or gas meters, aerials or antennas; and

(v)

pergolas, sun blinds or water tanks; and

(vi)

unroofed terraces, landings, steps and ramps, not more than 1 m in height.

(c)

Except as permitted by Open link in same page(d) encroachments listed in Open link in same page(b)(i), if Open link in same pagecombustible, Open link in same page(b)(ii) and Open link in same page(b)(iii) must not be built within 450 mm of an allotment boundary nor be built within 900 mm of the Open link in same pageexternal wall or associated encroachments of another building on the same allotment (see Open link in same pageFigure 3.7.1.9). 

(d)

Eaves with Open link in same pagenon-combustible roof cladding and Open link in same pagenon-combustible soffit or lining may encroach within 450 mm of the allotment boundary where the Open link in same pageexternal walls of a building are located not less than 900 mm from the allotment boundary and the walls are positioned at an angle of not less than 20 degrees and not more than 70 degrees to the allotment boundary or other building and the eaves only encroach at the corner of the roof (see Open link in same pageSA Figure 3.7.1.9a).

(e)

Fascias listed in Open link in same page(b)(i), if Open link in same pagecombustible, must not be built within 3 m of a Open link in same pagebrush fence.

 

Figure SA 3.7.1.9a

Concession for encroachment of eaves

Show Full Sized ImageFigure SA 3.7.1.9a CONCESSION FOR ENCROACHMENT OF EAVES

Figure 3.7.1.9

ALLOWABLE ENCROACHMENTS FOR NON-COMBUSTIBLE CONSTRUCTION

Show Full Sized ImageFigure 3.7.1.9 ALLOWABLE ENCROACHMENTS FOR NON-COMBUSTIBLE CONSTRUCTION

3.7.1.8 Separating walls

(a)

A Open link in same pageseparating wall between Class 1 buildings, or a wall that separates a Class 1 building from a Class 10a building which is not appurtenant to that Class 1 building must have an FRL of not less than 60/60/60 and—

(i)

commence at the footings or ground slab (see Open link in same pageFigure 3.7.1.10); and

(ii)

extend—

(A)

if the building has a Open link in same pagenon-combustible roof covering, to the underside of the roof covering (see Open link in same pageFigure 3.7.1.10 and Open link in same pageFigure 3.7.1.11); or

(B)

if the building has a Open link in same pagecombustible roof covering, to not less than 450 mm above the roof covering (see Open link in same pageFigure 3.7.1.10).

(b)

Where parts of a Class 1a dwelling are located above a Class 10a Open link in same pageprivate garage which is not appurtenant to that Class 1a dwelling, any wall separating parts of the Class 1a dwelling from a non-appurtenant Open link in same pageprivate garage must—

(i)

have an FRL of not less than 60/60/60 when tested from the non-appurtenant Open link in same pageprivate garage side; and

(ii)

extend to the underside of a separating floor complying with Open link in same page3.7.1.11.

(c)

A Open link in same pageseparating wall of Open link in same pagelightweight construction must be tested in accordance with Specification C1.8 of the BCA Volume One.

STATE AND TERRITORY VARIATIONS

In New South Wales delete 3.7.1.8(b) and insert NSW 3.7.1.8(b) as follows:

(b)

*  *  *  *  *

Note: The New South Wales Additions contain requirements for a Class 1a dwelling located above a non-appurtenant Class 10a Open link in same pageprivate garage.

Figure 3.7.1.10

SEPARATING WALL CONSTRUCTION

Show Full Sized ImageFigure 3.7.1.10 SEPARATING WALL CONSTRUCTION
(d)

A Open link in same pageseparating wall complying with Open link in same page(a)(ii)(A)

(i)

must not be crossed by timber or other Open link in same pagecombustible building elements except for roof battens with dimensions of 75x50 mm or less, or roof sarking; and

(ii)

must have any gap between the top of the wall and the underside of the roof covering packed with mineral fibre or other suitable Open link in same pagefire-resisting material.

(e)

Where a building has a masonry veneer Open link in same pageexternal wall, any gap between the Open link in same pageseparating wall and the external masonry veneer must be—

(i)

not more than 50 mm; and

(ii)

packed with a mineral fibre or other suitable fire resistant material with the packing arranged to maintain any weatherproofing requirements of Open link in same pagePart 3.3.4.

(f)

Eaves, verandahs and similar spaces that are open to the roof space and are common to more than one Class 1 dwelling must be separated by a Open link in same pagenon-combustible vertical lining (see Open link in same pageFigure 3.7.1.11 Diagram b).

(g)

Any service opening, other than those listed in Open link in same page(h), Open link in same page(i) and Open link in same page(j), in a Open link in same pageseparating wall must have construction with an FRL of not less than -/60/60.

(h)

If an electrical wire or cable penetrates a Open link in same pageseparating wall

(i)

the service and building element at the penetration must be identical with a prototype assembly which has been tested in accordance with AS 4072.1 and AS 1530.4 and achieved an FRL of not less than -/60/60; or

(ii)

the service must be installed so that—

(A)

the opening is neatly formed, cut or drilled and no closer than 50 mm to any other service; and

(B)

the opening is no larger in cross-section than—

(aa)

2000 mm2 if only a single cable is accommodated and the gap between the cable and the wall is no wider than 15 mm; or

(bb)

500 mm2 in any other case; and

(C)

any gap between the service and the wall is packed with mineral fibre or other suitable fire resistant material.

(i)

If an electrical switch, outlet, socket or the like is accommodated in a Open link in same pageseparating wall

(i)

the service and building element at the penetration must be identical with a prototype assembly which has been tested in accordance with AS 4072.1 and AS 1530.4 and achieved an FRL of not less than -/60/60; or

(ii)

the service must be installed so that—

(A)

the opening or recess must not—

(aa)

be located opposite any point within 300 mm horizontally or 600 mm vertically of any opening or recess on the opposite side of the wall; or

(bb)

extend beyond half the thickness of the wall; and

(B)

any gap between the service and the wall is packed with mineral fibre or other suitable fire resistant material.

(j)

Other than where a tested system is used in accordance with Open link in same page(i)(i), if an electrical switch, socket, outlet or the like is accommodated in a hollow Open link in same pageseparating wall (such as a stud wall, masonry Open link in same pagecavity wall or a wall of hollow blockwork), the Open link in same pagecavity immediately behind the service must be framed and packed with mineral fibre or other suitable fire resistant material (see Open link in same pageFigure 3.7.1.11 Diagram c).

Explanatory information:

It is important that any opening in a Open link in same pageseparating wall between Class 1 buildings not allow the free passage of fire between the buildings. On the other hand, many designs would require the installation of openings for electrical cables and outlets in these walls. Open link in same page3.7.1.8(g) therefore allows such openings provided they have an FRL of at least -/60/60 or comply with the details set out in Open link in same page3.7.1.8(h), Open link in same page(i) and Open link in same page(j).

Figure 3.7.1.11

SEPARATING WALL CONSTRUCTION—UNDERSIDE OF NON-COMBUSTIBLE ROOF CLADDING

Diagram a.  
Show Full Sized ImageFigure 3.7.1.11a SEPARATING WALL CONSTRUCTION - UNDERSIDE OF NON-COMBUSTIBLE ROOF CLADDING
Diagram b.  
Show Full Sized ImageFigure 3.7.1.11b SEPARATING WALL CONSTRUCTION—UNDERSIDE OF NON-COMBUSTIBLE ROOF CLADDING

Diagram c.

 
Show Full Sized ImageFigure 3.7.1.11c SEPARATING WALL CONSTRUCTION - UNDERSIDE OF NON-COMBUSTIBLE ROOF CLADDING

3.7.1.9 Fire hazard properties

The fire hazard properties of materials used in a Class 1 building, including common floor or ceiling spaces with a Class 10 building, must comply with the following:

(a)

Open link in same pageSarking-type materials used in the roof must have a Open link in same pageflammability index not greater than 5.

(b)

Flexible ductwork used for the transfer of products initiating from a heat source that contains a flame must comply with the fire hazard properties set out in AS 4254 Parts 1 and 2.

3.7.1.10 Roof lights

Combustible roof lights, skylights or the like installed in a roof or part of a roof Open link in same pagerequired to have a Open link in same pagenon-combustible covering must—

(a)

have an aggregate area not more than 20% of the roof or part of the roof; and

(b)

be not less than—

(i)

900 mm from—

(A)

the allotment boundary other than the boundary adjoining a road alignment or other public space; and

(B)

the vertical projection of a Open link in same pageseparating wall extending to the underside of the roof covering; and

(ii)

1.8 m from any roof light or the like in another building on the allotment other than an appurtenant building or a detached part of the same building. (See Open link in same pageFigure 3.7.1.12).

 

Figure 3.7.1.12

LOCATION OF COMBUSTIBLE ROOF LIGHTS

Show Full Sized ImageFigure 3.7.1.12 LOCATION OF COMBUSTIBLE ROOF LIGHTS
Note: Roof lights depicted in Figure 3.7.1.12 are Open link in same pagecombustible.

3.7.1.11 Separating floors

(a)

Where parts of a Class 1a dwelling are located above or below a Class 10a Open link in same pageprivate garage which is not appurtenant to that Class 1a dwelling, any floor separating the Class 1a dwelling from the non-appurtenant Class 10a Open link in same pageprivate garage must—

(i)

be a floor/ceiling system incorporating a ceiling which has a Open link in same pageresistance to the incipient spread of fire to the space above itself of not less than 60 minutes; or

(ii)

have an FRL not less than 30/30/30 when tested from the underside; or

(iii)

have a Open link in same pagefire-protective covering on the underside of the floor, including beams incorporated in it, if the floor is Open link in same pagecombustible or of metal.

(b)

Where a floor subject to Open link in same page(a)(ii) depends on direct vertical or lateral support from another part to maintain its FRL, that supporting part must have an FRL of not less than 30/-/-.

(c)

Where a service passes through a floor referred to in Open link in same page(a), the penetration must not reduce the fire performance of the floor or covering.

(See Open link in same pageFigure 3.7.1.13)

Figure 3.7.1.13

SEPARATING WALL AND FLOOR CONSTRUCTION

Show Full Sized ImageFigure 3.7.1.13 SEPARATING WALL AND FLOOR CONSTRUCTION

STATE AND TERRITORY VARIATIONS

3.7.1.11 does not apply in New South Wales.

Note: The New South Wales Additions contain requirements for a Class 1a dwelling located above a non-appurtenant Class 10a Open link in same pageprivate garage.