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Posted By: zebraI understand that XPS is breathable
Posted By: zebrahow do you tell the difference between EPS and XPS?
Posted By: zebraI take it you're using the silver grey stuff, not the white
Posted By: zebraWould you apply a backing coat of some sort on brickwork first to prevent there being little air gaps behind it?
Posted By: zebraI'm a little concerned because the leca stones are quite small
Posted By: zebraSo what are you going to finish it with, as the white stuff can't look good externally!
Posted By: zebraThe drain arrangement that I have now, which I built in the summer, has somewhere to drain to, but is not working because I'm still getting damp patches indoors.
Posted By: zebrathe very soft porous red bricks are absorbing the moisture from the ground as there's no DPC. The wall has not dried despite removing all the soil, gravel and everything which was up against it.
Posted By: countrymanGeotex membrane is only good for one thing and that is stopping roots blocking the drain/pipe/whatever.They do stop the fine soil blocking up the rain. They do it very well. So well, in fact, that the fine soil blocks up the geotex membrane
Posted By: JontiCorrect countryman about the geotex but if you are clever then you leave access points so you can flush the pipe on a regular basis.
Posted By: fostertomStill, we now have permission to simply leave out the geotex?!
Posted By: countrymanYou are wasting your time adding a geotex membrane if you are thinking that your French drain is going to be hunky dory and keep working for a long time. Geotex membrane is only good for one thing and that is stopping roots blocking the drain/pipe/whatever.They do stop the fine soil blocking up the rain. They do it very well. So well, in fact, that the fine soil blocks up the geotex membrane in a matter of months and so you are back to square one as the water cannot now get at your French drain.
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