replacing tile roof with tin and tying it down

Hi all. New user who needs some advice.

I am in the process of extending our house and I'm replacing the existing tiled roof with a new zincalume one.

My question is how do I tie down the existing roof frame? I have searched pretty thoroughly and am struggling to find an answer.

New roof frame has strapping attached to the brickwork but strapping is not installed in existing part of the house. I suspect the weight of the tiles negated the need.

The only info I have found is here: http://www.ucanbuildit.com.au/phpBB2..._building).pdf

I'm sure others here have gone through the same.

Any assistance would be greatly appreciated.
Cheers


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