High damp readings in internal walls

sgjfrods

I have recently bought a house and when doing so the survey flagged up high moisture readings within several downstairs walls. The suggested works required was to take the skirting board off and inject a new DPC. At the time i could see no visible signs of damp and the house was vacant and cold, for these reasons i came to the conclusion that it was nothing too serious and went ahead with the sale.

The house is approximately 1900-1920's build cavity wall construction and has a suspended floor with what looks to be a bitumen DPC.
I have now lived in the house for 2 years and have seen no visible signs of damp, however, when looking underneath the suspended floor found that the floor joists that where spanning onto the wall are visibly damp at there ends. The bitumen DPC is at the same level as the bottom of the joists. (i.e. the joists are sat directly on top of the DPC).Underneath the floor seems well ventilated. I have two main questions:

1.) Does this seem "normal" for a house of this age?
2.) It seems like new DPC's would be injected at skirting board level, i can see why this would prevent damp rising up the walls, however, it would still mean that the timber floor joists would be sat on a wet wall. How is this usually prevented?

Many Thanks for your replies in advance!

chunkytfg

How high is the ground outside? Above the DPC?

Before spending any money of trying to fix something that is unlikely to be an actual problem get an independent survey done

https://www.independentspecialistsurveys.co.uk/faq/

Dont go to a company offering liquid DPC for the survey as it is there job to find a reason to have done!