Damp proofing arrangements for the conservatory where it meets the existing building are a common area where mistakes are made.
A damp proof course (or DPC) is needed to make sure moisture doesn’t work its way up through the foundations and affect your conservatory.
The horizontal DPC needs to be continuous with the main home wall construction, with no gaps where damp can penetrate.
Vertical, sloping and horizontal abutments (places where the conservatory touches your house) has to have detailing that will help keep out damp: these might include cavity trays (a DPC that crosses the cavity), damp proof courses, damp proof membranes and flashings (thin water-resistant material that weather proofs joints) and these should all be linked.
This will involve cutting into the structure in order to physically separate the external and internal elements of the build.