I have damp problems so have removed the old lath & plaster stud walls, which has revealed a thick solid flint wall which is also damp (my house is 250 years old). How should I treat the flint wall before replacing the studwork with foilbacked plasterboard?

Wow ! sajjw, no answer but I am amazed at the age of your house ! Out of curiosity, came across this website and wondered if this chap may have some answers for you:

www.kiplinger.com/features/archives/2006/05/historichome

Is This actual flint natural rock? If it's a natural product go to a masonry supply house and ask for a good sealer that breaths one way. Professional sealers are there and not at a big box stores. It's a bit pricey getting commercial grade sealers but you want it to last.

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