1930s dpm

[Wall81]

Hi all, seeking help and advice.
Bought 1930s bungalow, suffering damp issues.
Firstly, the driveway is level to the DPC so I'm sorting that by removing blocks and doing a French drain type fix, but looks to have been this way for many years so the walls are very crumbly. I don't know if this is the cause of all the problems I have and I'm just chasing other problems unnecessarily. But...
I also have bubbling and peeling on some of the internal walls which leads me to think I have compromised DPC/ DPM (or is it just the driveway compromising the perimeter dpc for so long that it's got that far in?) These walls are 2 to 3m away from external walls, but the damp is located in the and general area.
I've recently started ripping a room apart and have found old cork tiles on what looks to be a layer of asphalt, so assume this is on top of the original concrete slab. Can I lay a new liquid dpm over the existing cork tiles, then screed (as its uneven). What would i do with the wall junctions? The walls seem to have a black colour but it's not the consistency of bitumen so unsure what it is ( shown in photos).
For info, I am sadly aware of the existence of asbestos wallpaper shown in the photos and doing my best to manage/ not disturb etc, I am versed in dealing with asbestos luckily.

Many thanks for all your help

 

[blup]

Ascertain which internal floors are suspended and which are solid before deciding what to do. The damp on the walls likely comes from a broken or missing dpc, although it might be water damage. I doubt there is any dpm on a house that age. Does the drive slope onto the wall or away from it?

 

[ree]

OP,
Is the bungalow on a hillside or sloping ground? Any retaining walls nearby?
Anywhere around the bungalow are any airbricks visible at low level?
Why not post pics of the crumbling bricks/French drain work?
What material is your external DPC? Check for a DPC on internal walls?
Dont lay anything over the cork tiles - take them up, & be certain of what the base is eg. a concrete slab?
Remove all the wall plaster & black stuff back to brickwork - go up as high as necessary plus 300mm.

 

[Wall81]

The drive has a very slight slope towards the house, which i thought may be driving the water into the house. I've added photos of the perimeter. I'm yet to inspect the cavity through the air bricks, and see what i can find in there too.
I've since uncovered the remainder of old fireplace in the middle of the floor that was badly backfilled with cement, and having removed that I've got down to the asphalt layer, that looks broken in places although no sign of damp in this location before. I'll add some photos of that. I've also started to remove the areas in the walls that suffered flaking and bubbling paint, and the cement is so dry and crumbling, so I've removed that as well, from about 1.5m high down to the floor as it was all so bad. I haven't suffered from damp in the floor area, so it's the cork coming up necessary? I can if needed, just it's quite a lot!

 

[ree]

OP,
Please answer all the questions that I ask or have previously asked?
And as poster #3 asked, which floors are solid which suspended? I notice only one airbrick (in a bay front).
Is the floor in the fireplace room a suspended floor or a solid floor?
Will you point out the cork in the above pics?
Just behind the fireplace has a wall been removed & replaced with a boarded partition?
FWIW: most 1930's houses had DPC's (your DPC is in the thick mortar bed) - many had cavity walls.

 

[Jurassicspark]

And as poster #3 asked

Surely that's you?

 

[ree]

Poster #6,
Thank you for correcting me.

 

[Wall81]

Apologies, in my rush to get info out i missed the questions!
The bungalow is on a generally flat area but the driveway does slope towards the house. The whole perimeter of the house has the dpc at roughly the same level as the driveway, side access path and neighbour, so i believe this is a source of issues. I haven't take a photo of the side which is the neighbours driveway, but all the bricks and mortar are crumbling badly and need treatment.
The previous owners of this bungalow had a large quantity of damp proofing liquid cans in the garage, absorbant crystals etc so clearly the had suffered damp for some time.
As far as I can tell the whole bungalow is a solid concrete slab, no suspended floors.
The fireplace is found next to what was an old wall. I believe this was a load bearing wall that was removed decades ago, I have since rebuilt this wall but before I did it found a trench of concrete they had poured and a slate dpc underneath that (the concrete easily lifted away as they had poured it onto a plastic sheet! I'll add a photo.
The cork tiles actually look to be more of a chipboard type tile, removing the carpet grippers nailed into these exposed some. Photo attached.
It also looks like the previous owner did a bitumen based paint before reskimming as shown in the photos, but I'll be removing that back to brick and treating it.
I've done a basic sketch of the front of the house showing damp areas marked in red. Although none of the areas are feeling wet i haven't actually tested the dampness yet, but paint is peeling and the plaster is crumbling.
Thank you for all the input so far, and appreciate the patience while I got to the questions!