Quote:
Originally Posted by vwnate1
Thank you .
Yes, I was talking about a plastic / nylon barrier sheet because moisture comes up eventually if you don't have one and the vehicle will rust away over time .
I wasn't asking about regulations .
That weed barrier mesh crap is just that : crap .
My son tried it after I told him to line mt grand daughter's sand pit with vapor barrier, of course the weeds don't give a care about any mesh no matter how tight it is and it wasn't tight .
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The anti-root membrane I got was commercial / agricultural grade stuff. I think it has a weight of about 200 grams per square meter and can even be used above ground as it has a UV resistance of something like 10 years. Mine's firmly underground so I expect it will be there for centuries.
I saw some cheaper anti-root membranes available but they didn't seem to me to be a worthwhile investment.
I hope it works. The clay like sand on top of it isn't exactly ideal growing "soil" so I'm fairly confident I won't get too much root related trouble (cos I also spent a 'ucking long time pulling roots out too).
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I'm not sure about "rising damp". This place has a shoddy extension between the (brick) house and a brick shed that has a concrete tiled floor set on sand. (Quite a common thing here in the Netherlands). So far it hasn't been damp at all. There is an ant problem in the summer but this year they helpfully swarmed and flew away outside and not in the building (!)
The water table here is about 2 meters under the (raised) ground level so foundations / feet elements of this workshop I'm building are way above the ground water source.
I'm pretty sure the gravel ballast doesn't have enough contact area for capillary action. Whilst I've not got extensive work experience of railways most of the wooden railway sleepers I've seen seem to rot from the top down not the bottom up.
I will certainly have to keep the base well ventilated once I get the roof and sides of the building built to get rid of the moisture that has accumulated during the prolonged building period...
...all in all I reckon it'll come good - but - thanks for the advice.