Roof extension with larger rafters

We are extending a roof on an old house. The old rafters are all 3 x 2s notched onto the top plate. The engineer has specified notched 7 x 2s for the new bit. How can we do this? If you notch the 7 x 2s to match the height of the older timber you have a notch that cuts more than halfway through the rafter. We were hoping to have the extension's ceiling height match the existing ceiling height with square set gyprock. And of course wanted the roof to marry in with the existing roof.


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