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That was interesting, thanks. But you might be pleased that the most modern system at least in Finland actually has little of the same features than the romans

by vlehto 8y ago

That was interesting, thanks. But you might be pleased that the most modern system at least in Finland actually has little of the same features than the romans had. If you look at the same membrane I posted earlier, it has little knobs that hold it little bit away from the wall: https://monosilla.files.wordpress.com/2014/11/screenshot-2014-11-14-17-27-57.png https://monosilla.files.wordpress.com/2014/11/screenshot-201... I don't know the English word for it. It's not perfect, but lot better than couple decades ago. They used to paint the concrete with tar. This "patolevy" is cheaper, easier to install and allows little bit of ventilation.

jaclaz 8y ago
Yes, I know those, though - technically - they are not a waterproofing membrane, they are intended (at least here) to be only a mechanical protection and a separation layer, and the height of the knobs is anyway too small to have an actual ventialtion. Besides - usually the "top" of the layer is not properly sealed/protected so - over time - the space (at the bottom)is filled with fine sand/dust brought by wind/rain, of course preventing any ventilation where it is more needed. "Bigger brothers" do exist, like: https://www.youtube.com/watch?v=dnxj9mTN9NE https://www.youtube.com/watch?v=dnxj9mTN9NE still they are usually placed over the waterproofing layer, this should guarantee: 1) that the actual waterproofing is not punched by a stone or whatever when filling the excavation 2) that the waterproof membrane is not "immersed" in humidity