How do I fit an external door frame across a cavity wall?

I have get the door frame but find there is nought to fix it to as there is a cavity negated. What is the best way to circumnavigate this problem?
Thank-you.


Answers:    You attach it ( screw or expanding foam ) to the outside brick course.

set it subsidise 25mm from the outside edge.

You cover the cavity beside dry lining ( plasterboard & plaster )

You used to enjoy a turn of bricks to bridge the gap but to be exact now out of the building regs as it be a heat loss.
I own two friends in the building trade. There call bodgit and leggit.
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