We have recently had some underfloor pipework done which appears to have broken our damp proof seal (done about 20 years ago)in some places. As this has happened in the last few weeks will it be necessary to get the walls replastered after the damp is fixed? How long does it take for salts to build up in the walls?
damp and salts in walls
- Thread starter suemcel
- Start date
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1. what do you mean by:
"broken damp proof seal"
"done about 20 years ago"
2. Has there been a water leak under the floor, in the wall(s)?
What "underfloor pipework" have you had done?
"broken damp proof seal"
"done about 20 years ago"
2. Has there been a water leak under the floor, in the wall(s)?
What "underfloor pipework" have you had done?
2 walls are beginning to show a line which we assume is damp exactly where we had the damp problem 20 years ago.
We had the concrete floor drilled out to replace old central heating piping. This involved going through some walls at ground level
What "happened in the last few weeks"? The work, or the appearance of a "damp" line?
What reasons/causes were given for your damp problem of 20 yrs ago?
What treatment took place at that time?
Where is your DPC - above your solid floor or below it?
C/H pipework does not go thro external walls - thats if we are talking external walls. If internal walls then the damp line will show on both sides of the wall(s).
I ask these Q's because it's a false economy to treat the appearance of damp and not locate the cause.
What reasons/causes were given for your damp problem of 20 yrs ago?
What treatment took place at that time?
Where is your DPC - above your solid floor or below it?
C/H pipework does not go thro external walls - thats if we are talking external walls. If internal walls then the damp line will show on both sides of the wall(s).
I ask these Q's because it's a false economy to treat the appearance of damp and not locate the cause.
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Don't know cause of damp 20years ago but there had been a lot of extension and building work.
We had chemical injections into the wall where the skirting boards had been taken off above the solid floors. This did the trick up until now. The affected walls are internal and the damp is beginning to show on both sides.
You imply that no hack-off and re-rendering took place 20yrs ago, hence, salts could be well up the walls.
Your skirtings will probably have been affected with fungal damage.
Briefly, in your case, its probably best to remove skirtings and rads, and knock-off to 1m ht. and then render up in a mix you can research on here, or use remedial plaster.
Keep the new render 40-50mm off the solid floor, even if your solid floors have been laid on membranes.
No DPC treatment required.
The above should be good for 20 to 30yrs.
Your skirtings will probably have been affected with fungal damage.
Briefly, in your case, its probably best to remove skirtings and rads, and knock-off to 1m ht. and then render up in a mix you can research on here, or use remedial plaster.
Keep the new render 40-50mm off the solid floor, even if your solid floors have been laid on membranes.
No DPC treatment required.
The above should be good for 20 to 30yrs.
Sorry if I gave the wrong idea but we did have it hacked off and replastered 20 years ago.
We did have the hack off and rendering 20 years ago
In that case, judge how high to hack-off, but still do as i recommended.
Do extensive research on here and google, and get a thorough grounding in the subject.
Do extensive research on here and google, and get a thorough grounding in the subject.
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