Specification 10 Fire-protected timber
S10C1
Scope
2019: Spec C1.13a: 1
This Specification contains requirements for fire-protected timber and procedures for determining the time at which the temperature at the interface between the protection system and the timber is exceeded.
Requirements
S10C2
General requirements
2019: Spec C1.13a: 2.1
- utilise a non-combustible fire-protective covering fixed in accordance with the system requirements to achieve an FRL not less than that required for the building element; and
- have a non-combustible fire-protective covering fixed in accordance with system requirements—
- to achieve a resistance to the incipient spread of fire of not less than 45 minutes when tested in accordance with—
- for horizontal elements — Section 4 of AS 1530.4; and
- for other elements — the relevant test procedures from Section 4 of AS 1530.4 applied to the element lining; or
- which consists of not less than 2 layers of 13 mm thick, fire-protective grade plasterboard.
- to achieve a resistance to the incipient spread of fire of not less than 45 minutes when tested in accordance with—
S10C3
Massive timber
2019: Spec C1.13a: 2.2
- utilises a non-combustible fire-protective covering fixed in accordance with system requirements to achieve an FRL not less than that required for the building element; and
- has a non-combustible fire-protective covering fixed in accordance with system requirements—
- so as the temperature at the interface between the protection system and the timber does not exceed 300°C during a fire resistance test performed in accordance with S10C4, S10C5 and S10C6 for the application and periods listed in Table S10C3; or
- not less than that specified by Table S10C3; and
- has any cavity filled with non-combustible insulation, or no cavity, between—
- the surface of the timber and the fire-protective covering; or
- timber elements within the fire-protective covering.
Application | Time – without timber interface exceeding 300°C (mins) | Minimum thickness of fire-grade plasterboard (mm) |
---|---|---|
Inside a fire-isolated stairway or lift shaft | 20 | 13 |
External walls within 1 m of an allotment boundary or 2 m of a building on the same allotment | 45 | 2 x 13 |
All other applications | 30 | 16 |
Determination of time the timber interface temperature exceeds 300°C for timber at least 75 mm thick
S10C4
Form of test
2019: Spec C1.13a: 3.1
- At joint positions in the protection systems.
- At least 200 mm from any joint.
- At service penetrations.
- At any other locations where, in the opinion of the Accredited Testing Laboratory, the interface temperature may be higher than the above positions.
S10C5
Smaller specimen permitted
2019: Spec C1.13a: 3.2
An Accredited Testing Laboratory may carry out the test specified in S10C4 at pilot scale provided—
- a specimen (which must be not less than 1000 mm x 1000 mm) adequately represents the proposed construction in the building; and
- the fire resistance of the specimen has already been determined in a full scale test performed in accordance with AS 1530.4 to demonstrate adequate retention of the fire protection system in conjunction with the timber elements being protected; and
- the results of the test do not apply to construction larger than limits defined by the Accredited Testing Laboratory conducting the pilot examination.
S10C6
Acceptance criteria
2019: Spec C1.13a: 3.3
The time the timber interface temperature exceeds 300°C must be taken as the minimum time any of the thermocouples specified in S10C4 exceeded 300°C.