I have noticed this damp patch on the inside of a wall. I can see some green / water marks on the outside and there is a Down pipe located there too. Would it be a case of a damaged gully and I would need to dig to investigate?
Damp patch
- Thread starter SALL2009
- Start date
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1. on the outside of the wall where is your DPC bed course?
2. clear away all vegetation thats close to the house walls.
3. please post pics of where the RWP goes into a gulley or the ground? Do you know if your rainwater goes to mains drainage or a soakaway? And a pic showing the gutters?
4. your interior pic shows possible rising damp & possible penetrating damp - however, if that jig-out is a chimney breast then you might have hygroscopic damp from an un-swept, unventilated flue .
5. do you have a solid floor with a wood overlay? check the wood flooring for damage.
6. you will need to remove skirtings, and the rad, to reveal the extent of the damage.
7. can you post a pic(s) of the whole interior wall?
2. clear away all vegetation thats close to the house walls.
3. please post pics of where the RWP goes into a gulley or the ground? Do you know if your rainwater goes to mains drainage or a soakaway? And a pic showing the gutters?
4. your interior pic shows possible rising damp & possible penetrating damp - however, if that jig-out is a chimney breast then you might have hygroscopic damp from an un-swept, unventilated flue .
5. do you have a solid floor with a wood overlay? check the wood flooring for damage.
6. you will need to remove skirtings, and the rad, to reveal the extent of the damage.
7. can you post a pic(s) of the whole interior wall?
Last edited:
Thanks for the replies. Here are some more details.
1. The DPC is just above the bottom course of bricks that can be seen.
2. Yeah getting rid of it all.
3. The RWP goes into ground. As far as I know the water goes to mains drainage.
4. There just the door next to it. Main issue seems to be in the corner. Attached another picture.
5. Yeah there is solid floor below that area.
1. The DPC is just above the bottom course of bricks that can be seen.
2. Yeah getting rid of it all.
3. The RWP goes into ground. As far as I know the water goes to mains drainage.
4. There just the door next to it. Main issue seems to be in the corner. Attached another picture.
5. Yeah there is solid floor below that area.
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So I've cleared most of the plant and it looks like the roots of the plant were above DPC level and the worst signs of damp are where the roots are and not the RWP. So could removing the plant fully resolve the issue for the future? And do you see any point in digging by the RWP to look for damage at the base?
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The column of green bricks on the corner of the wall suggests that water is running down it from a defective gutter above. It looks as if the mortar has been eroded by the same cause. Though a different brick type has been used, perhaps for decorative effect or repair.
Stand back and take some pics of the entire house, roof to ground, end wall and side.
I expect you have noticed that the ground level is too high, close to the airbrick and the DPC
There is a flexible hose but I don't see where it is connected.
Stand back and take some pics of the entire house, roof to ground, end wall and side.
I expect you have noticed that the ground level is too high, close to the airbrick and the DPC
There is a flexible hose but I don't see where it is connected.
After clearing the garden how do you plan to go about the wall beside the radiator: does the damage extend behind it?
OP,
You will have to dig out all the roots of the shrubs - while digging out, lower the soil level.
You will also need to dig around the RWP to check for leaks.
The RWP should discharge into a trapped gulley.
The green algae on the lower brickwork is wet spillage from the foliage.
You have cavity walls and a solid floor - so why is there an air brick? What is it supposed to be ventilating?
Are there any more air bricks around the property?
Your Pvc floor tiles will hardly be affected by the damp unless moisture is coming up from the solid floor.
When the skirting is off a solid floor DPM(membrane) should be revealed?
The damp is probably rising damp or penetrating damp across a bridged cavity - removing a few interior wall bricks will show if the cavity is bridged.
After removing the rad & skirting post a pic - you will need to hack off back to brickwork all the plaster up to 300mm above the last signs of damp.
Making good should be a 4:1 mix of sand & NH lime render.
A pic as in item #7 would help?
You will have to dig out all the roots of the shrubs - while digging out, lower the soil level.
You will also need to dig around the RWP to check for leaks.
The RWP should discharge into a trapped gulley.
The green algae on the lower brickwork is wet spillage from the foliage.
You have cavity walls and a solid floor - so why is there an air brick? What is it supposed to be ventilating?
Are there any more air bricks around the property?
Your Pvc floor tiles will hardly be affected by the damp unless moisture is coming up from the solid floor.
When the skirting is off a solid floor DPM(membrane) should be revealed?
The damp is probably rising damp or penetrating damp across a bridged cavity - removing a few interior wall bricks will show if the cavity is bridged.
After removing the rad & skirting post a pic - you will need to hack off back to brickwork all the plaster up to 300mm above the last signs of damp.
Making good should be a 4:1 mix of sand & NH lime render.
A pic as in item #7 would help?
Your door threshold/ brickwork to the left looks to have had repairs done in the past so I'd be looking there as well. It's possible water is being driven into the wall.
You still need to dig out the built up soil from the wall
You still need to dig out the built up soil from the wall
It seems to me you'll need to dig out the root of that bush beside the drainpipe and have extensive work done on the corner, inside and out.
I've dug out these areas before and it's a sod of a job. I'd agree the soil needs to be removed from the brickwork and a soakaway put in place.
(see post #9 for further details.)
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