DPC below floor - possible?

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8 Jun 2017
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Hi

Looking for a bit of advise with regards to the below to see what is achievable

I want to join house A to a separate garage B (pink section to be built)

DPC.jpg

DPC2.jpg


The DPC of the existing garage is much lower than the house and I need to increase the depth of the internal floor and would also like to increase the height of the external patio (green) so the opening is flush when I add a french door to the garage and eliminate the need for steps.

Is this possible at all with suitable drainage or additional dpc. Garage is double skin with a 20mm cavity

The distance where the dpc will be low is approx 2 meters although 1m of that will be newly installed french door

Thanks in advance
 
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