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Page 4
Australian Building Codes Board
PART F1
DAMP AND WEATHERPROOFING
Deemed-to-Satisfy Provisions
F1.0 Deemed-to-Satisfy Provisions
(a)
Performance Requirement FP1.4, for the prevention of the penetration of water
through external walls, must be complied with.
There are no Deemed-to-Satisfy Provisions for this Performance Requirement in
respect of external walls.
SA F1.0(b)
(b)
(c)
Where a Building Solution is proposed to comply with the Deemed-to-Satisfy
Provisions, Performance RequirementsFP1.1 to FP1.3 and FP1.5 to FP1.7 are
satisfied by complying with F1.1 to F1.13.
Where a Building Solution is proposed as an Alternative Solution to the Deemed-to-
Satisfy Provisions of F1.1 to F1.13, the relevant Performance Requirements must
be determined in accordance with A0.10.
F1.1 Stormwater drainage
Stormwater drainage must— comply with AS/NZS 3500.3.
(a)
comply with AS/NZS 3500.3; and
(b) where eaves gutters are installed, be designed to remove rainwater falling at a 5
minute duration rainfall intensity for a—
(i)
(ii)
100 year average recurrence interval; or
20 year average recurrence interval, if not less than one overflow measure
per downpipe is installed in accordance with Table F1.1b to remove the
appropriate overflow volume in Table F1.1a.
Table F1.1a DESIGN OVERFLOW VOLUME
Design overflow Roof catchment area per downpipe (m 2 )
rainfall intensity
30 40 50 60 70
(mm/h) (see Note 1)
Design overflow volume per downpipe (L/s)
40 0.33 0.44 0.56 0.67 0.78
PUBLIC COMMENT DRAFT
50 0.42 0.56 0.69 0.83 0.97
60 0.50 0.67 0.83 1.00 1.17
70 0.58 0.78 0.97 1.17 1.36
80 0.67 0.89 1.11 1.33 1.56
90 0.75 1.00 1.25 1.50 1.75
F1.0
NCC2014 Volume One