Page 58 - Build 165

Medium-density housing
Future work will validate these model results using new experimental data.
One rule may not be suitable for all
This research has uncovered the likely basis for the 9 to 5 rule for re spread from lower roofs. Modelling has supported this require- ment, although it has also shown that the current one-size- ts-all approach may not be suitable for all lower roof con gurations.
A BRANZ study report providing details on the modelling methods used, validation experiments and regulatory requirements in other jurisdictions will be made available shortly.
Note For the report, see www.branz.co.nz/ study_reports. This research was funded by the Building Research Levy.
13 13 12 12 11 11 10 10 99 8 8 7 7 6 6 5 5 4 4 3 3 22 11 00
droof = 5 m Q̇ =12MW
droof = 10 m Q̇ =39MW
droof=15m Q̇ =84MW
droof = 20 m Q̇ =152MW
droof = 5 m Q̇ =12MW
droof = 10 m Q̇ =39MW
droof=15m Q̇ =84MW
droof = 20 m Q̇ =152MW
0 1 2 3 4 5 6 7 8 9 10
Distance from re (m)
(a) vertical ames
Figure 2: Allowable heat intensity contour for ames from a venting roof ranging from 5 m to 20 m square openings (single-storey contributing).
0 1 2 3 4 5 6 7 8 9 10
Distance from re (m)
(b) ames tilted at 45°+ vertical ames.
56 — April/May 2018 — Build 165
FEATURE SECTION
Height from the re base (m)
Height from the re base (m)