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#1025895 - 31/10/2011 13:22 House Cyclone Ratings
SBT Offline
Meteorological Motor Mouth

Registered: 07/02/2007
Posts: 14219
Loc: Townsville Dry Tropics
There is an Australian Housing Standard for wind loading (Cyclone Ratings) which WA,NT and QLD follow.

Cyclone House Ready document. A combined WA/NT/QLD governments cyclone prep guide which as information on cats of cyclones, wind speeds, ratings etc.

The new Cyclone Rating building codes are as follows:
Wind Specification:
C1 180 kph
C2 220 kph
C3 266 kph
C4 310kph

Combined with the wind specifications there are the following:

A house in Townsville (Kirwan) built in a suburb surrounded by homes on a slope of less than 1 metre in 10 situated on the lower 1/3 of the slope would be considered:
Region: C
Terrain: 4
Shielding: 2
Slope: 1
Location: 1

Estimated wind rating would be C1

A house fronting the ocean at Pallaranda would be:
Region: c
Terrain: 1
Shielding: 3
Slope: 2
Location: 3

Estimated wind rating would be C3.
Click on the link below to find out what rating your house should have. To check what rating your home has you would need to find out from your local council.

Please note these are recent cyclone ratings. for homes built before these came into force the old W ratings where used. Again you would have to go to your local council to find out what your present rating now is.
July 6mm
2018 Total 743mm

#1026294 - 02/11/2011 16:34 Re: House Cyclone Ratings [Re: SBT]
Maisie Offline
Weatherzone Addict

Registered: 21/03/2004
Posts: 1515
Loc: Bluewater Park,Nth of Townsvil...
Just sent an email to the council to see what our rating is in the new C system.
We are W50 in the old system and I know it had to be higher out here than town.
It cost more to build but better safe than sorry, Hopefully.
I believe that the homes in Yarrawonga and up on the hill are also W50.
I also suggested to Council it might be helpful for residents to be able to compare their ratings with the old and the new and maybe add it to their website somewhere.
Probably waste of email but worth a try.

#1026308 - 02/11/2011 17:16 Re: House Cyclone Ratings [Re: Maisie]
SBT Offline
Meteorological Motor Mouth

Registered: 07/02/2007
Posts: 14219
Loc: Townsville Dry Tropics
Probably going to be C3 as that is the highest rating for Queensland. The only higher rating is some areas of the WA Coast, according to the website I linked above.

My house was built to W42 standard which should now equate to a C3 from what i can work out using teh sheds online website. (We where teh first in a block of 4 with no homes between us and Mt Stuart across the river. Now surrounded by homes which are rated lower than what we are which is pretty handy. Just makes our house even more secure.)
July 6mm
2018 Total 743mm


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