Damp patch on internal wall (Ed.)

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Hello, I am hoping someone will have some ideas/insight into solving my damp issue, a damp patch started appearing about a year ago and has been slowly growing ever since, as you can see by the photos it is very obvious.
I haven't got much knowledge at all with building works however I will have a go at anything, the house initially had some damp at low level around the walls but nothing major, the walls in this room were then all replastered around 3 years ago, I injected a DPC cream from permagard around the permiter of the house as you can see in the photos (outside) from where the holes have been plugged. The patio slabs were also butted up against the brickwork, so I have cut all these back 100mm, dug down, cleaned the brickwork and painted with bitumen below the old DPC level, then concreted it with a slope down towards the drain/gully round the corner, then filled with slate, as an attempt to get some better drainage around the house.
So after all this work, I still had this damp patch slowly appear inside, I then resorted to taking out some of the bricks outside to look inside the void and clear any debris or anything that may bridge the DPC, filled up a full bucket of dirt/grit/debris from inside the void but nothing noticeably damp, I then put the bricks back as you can see in the photos, so after all this, the patch still continues to grow...any other ideas would be greatly appreciated!? My next idea was to take up the floor and look underneath the suspended floor, as you can see I have large tiles so I was hoping it wouldn't come to this as i'm assuming i'd probably end up breaking a tile trying to get it out, but it remains a mystery for me, so any guidance I would be very grateful for!

Thank you in advance
 

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Add air bricks to vent cavity?

All water around house is being captured and taken away ok? No cracks in drain collection points which can lead to water getting under house.
I seen a house flood with water under floorboards when it rained because of cracks in concrete around drains.
 
Thanks for the response, I have now taken the skirting off and broken up the tile (have a few spares) got down to the floorboards which were certainly damp with some rot, taken the floorboards up and discovered they were laid directly onto a concrete floor that looks like it’s had some sort of bitumen coating on it which has broken up. The concrete is also very damp, not sure where to go from here but any help would be greatly appreciated! I was thinking of cutting the bottom of the wall off around 40mm up from where it meets the concrete to seperate them? Don’t want to cause any more issues though. Will attach some photos, thanks again.
 

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Where is the old DPC? Can you mark it in your photos? Stand back and take some wider photos please, all the way from roof to paving. Include gutters and downpipes. Round the corner as well please.

Does the damp rise to the same height on every wall?

Please draw a floor plan of the house (include all pipes and drains) and indicate where the damp patches are.

In your pic the damp seems to be in one particular corner. Is that true? Is there drain or radiator pipe nearby?

Are you in a hard water area? Can you see the lime bloom on the wall?

Do you think the concrete floors were original when the house was built?
 
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OP,
You will have to be certain that the base floor material is "concrete"?
No DPM membrane can be seen - so the "concrete" seems to have been laid directly on soil?
The wall plaster should not go down to below the FFL - it should stop a little above the FFL.

You have a choice:
1. You can dig the floor or floors out, and install a new floor to modern Regs. This might be your best choice.
Why? Because so far you seem to have evaded dry rot in conditions that are favourable for dry rot.
2. You can remove all damp damaged plaster, and replace it with a sand & lime render, & do nothing else.
 
Last edited:
Poster #6,
I am sorry that you dont understand - what exactly is it that you dont understand?
BTW: Regs is often capitalised to indicate that its an abbreviation of Regulations.
 
Posters #9,6&10,
Its disheartening that after all my efforts to teach you people a little good manners and word identification that you all fail again - perhaps you all failed better this time?

But no - you attempt to insult me by ignorantly calling me a pendant, which, of course, means a shining jewel.
Do you consider me to be the shining jewel of your lives?
I'll accept that but do please learn to think before making things worse for yourselves.
 

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