Found another possible problem, how bad is this reading for damp, I have attached the damp report the seller done for me, where I have put the pencilled arrow, around 11.1 readings he is getting I am getting 17 to 18 in the second video.
The photo with the arrow is where I am getting the 20+ reading at the front left hand side, not sure where it is on his report.
He has put on the report there is no obvious signs of damp is the 20% a reading he should have taken in that spot and is it an obvious sign of damp or just normal for this age of caravan, it is just a bit suspicious why I am getting higher readings than he got, I am assuming he has a much more accurate meter than the one I have.
Thank you all again for the help.
View attachment 2019
View attachment 2021
Here is a couple of pictures of the outside rail above where I am getting the high readings.
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View attachment 2028
View: https://vimeo.com/577161594
View: https://vimeo.com/577192052