Damp proofing increases risk of damp and mould

Damp proofing increases risk of damp and mould. Here a Victorian ground floor flat, in London has previously been damp proofed against rising damp 3 times, but still there is dampness and mould.

[@philipoakley5498]

Warm humid air starts at (rises to) the ceiling, spreads out, cools against the walls (especially exterior/cooler ones), the air starts to descend (inverse chimney), and at some point it reaches a part of the wall that is at the dew point and starts to deposit the drops of moisture, which further reduces the buoyancy of the air, so it drops further and continues condensing on the wall, with the majority of the condensation toward the base. As stated, to the uninitiated, it looks just like 'rising' damp', though it is the same pattern as we see on windows, so it should be no surprise (though it does take an 'ah ha' moment to see the similarity, and realise the inverse chimney effect).

[@thebanditsix]

The homeowner has damp clothes drying inside the house which will cause high humidity.

[@matthewnichols6687]

Yes and he faild to mention it, probably never explained to customer it's a bad idea. Vented out tumble dryer or a condensing one would be advised. But it's easier to just blame the damprofer as it's been done therefore giving a get out of jail free card if his so called expert advice doesn't resolve anything. He also says damprofer has faild when clearly it hasn't because black mold carnt grow where there is salt deposits from rising damp. At end he says walls carnt absorb moisture or vapor because of damp cource? How can an untreated wall with rising damp in it absorb moisture or vapor when it's soaking wet with rising damp😂.

[@GWAYGWAY1]

Don’t trap it between plaster and added cement pointing, allow it to evaporate ad keep it ventilated. Victorian houses worked when they were built not now, they didn’t have showers and tumble dryers .

[@alanrobertson9790]

I don't understand the argument of this video. They had a rising damp problem so they put on non-absorbent plaster and passive vents etc. Then this guy comes along and says the condensation comes out on the walls. But you can treat condensation by having dehumidifiers which won't solve a rising damp problem. So why not adopt BOTH solutions, either individual prevention measure won't solve the other. So why is this guy complaining about measures taken against rising damp.

[@alanrobertson9790]

Don't understand this video. Humidity and rising damp are two different problems needing different solutions. You need both so why is this guy complaining about treatments made for rising damp rather than simply putting in dehumidifiers, ventilation, fans etc.

[@andyman1032]

what are you supposed to do if you got rising damp then ??

[@ashestoashes3107]

Find the course. Blocked drains, obstructions, DPC bridging. Simple finds.....

[@andyman1032]

@@ashestoashes3107 are you a damp expert??

[@patrickvernall1553]

Understanding of how moisture can pass through a building fabric through a process known as diffusion, diffusion is triggered by vapour pressure differential.

[@alanrobertson9790]

Video is illogical. There is nothing wrong with measures taken against rising damp. The solution is to solve also the humidity problem also not slag off the other measures. I was waiting to hear the solution in this video but it was never explained.