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you could argue render is porous both ways whereas they are trying to advertise some sort of goretex-like one way porous cover
But I agree, I didn't like the sound of it either way, was very much a sales pitch
apc-
How old is the building?
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Lime render is certainly porous - cement, not so much. If it cracks & lets water in, it's not going to let it out.
The goretex-like stuff they sell doesn't either, and also ruins the softer brickwork of older houses.
How long ago did you dig the trench?
[Edit] Just checked the DIY thread - 2 weeks doesn't seem nearly long enough for damp troubleshooting - I've given our damp problems 6 months plus to see if things are working out.
The green bit could be water being splashed up the wall -the gravel should stop that though (assuming there's no guttering problems above)..
What's on the inside of the house - what flooring is there?
mustardbeak
NotThamesWater
Which is no different to cement render, insofar as it's fine if it's entirely contiguous, and never cracks. At which point it is substantively worse than no render.
My guess is that it is a very limited guarantee, and would need to be paid for every few years. And not underwritten at all, so pretty worthless (ibid. Everest 2020 up thread.
They are a salesperson, not a builder, surveryor or engineer
Eurocote / Plasticote etc... is faddy, pressure sales crap.