renovating old house

renovatormayo

We have an old 1920s and 1060s built house.
We hope to redo the wall surfaces in the 1920s part as there is some damp at the bottom foot or so on the external wall.
What would be the correct procedure. I will be getting a builder but I dont want a slap up job that will be damp or wrong.
Im assuming the wall paper will be taken off, loose surface taken away and replastered.
Im also looking to insulate at the same time so is fitting insulated slabs to inside of external walls a good idea? These are old stone walls about 2 ft thick.
So would I need a freshly plastered wall all over before fitting insulated slabs?
Would an isolated new wall be a better idea - timber stud insulated and slabed but kept away from the old crumbly wall.
Also, what is involved at the ceiling junction - ceiling was replaced a few years ago and are good. Is it ok to plaster up to existing ceiling? Will that joint crack?
Also one end of the house has an apex / high ceiling and for whatever reason, the drafts are shocking. Someone suggested that I could run a membrane all around the ceiling inside and seal it only the wall that are being repaired to exclude all drafts. What do people think of this idea? Also with this airproof membrane, what should I then install - a plain slab, insulated slab or silver back slab (Im told they are for where hot cold meets)
All advice welcome.

MicktheMan

renovatormayo wrote: »

All advice welcome.

Get off the internet and hire a competent professional to advise you.