Damp proof course issues - My House Extension

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A one storey extension
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Possible damp proof course issues
 
The extension will straddle two parts of my house. The left-hand-side bit was built in the 1800s and the right-hand side in the 1930s. Initial inspection seems to show that the DPC level lies at a lower level in the new part to the old part. As I definitely want an internal floor without a step I will have to see what impact this might have.

The extension will straddle two parts of my house. the left-hand-side bit was built in the 1800s and the right-hand side in the 1930s. Initial inspection seems to show that the DPC level lies at a lower level in the new part to the old part. As I definitely want an internal floor without a step I will have to see what impact this might have.
The 'DPC' in the old part of the house behind the external toilet.
Actually, the old part of the house does not have a DPC as is seen in modern homes. The DPC was formed by pouring pitch over the wall which you can see running down the wall. It is also quite high on this side of the house.

It's interesting to note that the outside toilet's DPC (if there is one) is below the one in the main house wall!
Assuming the DPC runs around the house at the same level it can be assumed to be at this level here, although the air brick is above the DPC on the further side of the house. I'll need to knock away some the render to see the true situation.
A difference in height between the old house and the new extension means that the damp proof membrane needs to extended up the existing house wall and keyed into the DPC of the existing house at a higher level and covered by plaster.
'Tanking' the damp proof membrane to compensate for different heights of the DPC
Copyright: Chris Gare 2007 - 2018
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