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Topic: Help needed!, Block paving< Next Oldest | Next Newest >
Djcatfood
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Posted: 09 Oct. 2019,20:05 QUOTE

Advise needed .. I want to extend my driveway. I dug the footings down 200mm put a textile membrane down and 100mm of grade one and whacked it down. The problem is that itís on wet clay and itís spongy. What are my options??
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Djcatfood
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Posted: 10 Oct. 2019,20:45 QUOTE

Iím going to dig up a section and see how dry it is? if itís wet is it advisable to add more mot 1 or something larger ie brick rubble underneath?

Any help would be much appreciated :D
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Djcatfood
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Posted: 11 Oct. 2019,20:03 QUOTE

Anyone?
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Bob_A
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Posted: 12 Oct. 2019,11:55 QUOTE

In my experience you will get an answer, they are a very helpful lot on here but they are also busy making a living. Sometimes you get an answer straight away, sometimes you have to wait, just the way it goes  :D
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Tony McC
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Posted: 13 Oct. 2019,10:00 QUOTE

I do try to check the Brew Cabin every day, but sometimes it's just not possible for all of the reasons Bob mentions and a whole host more!

Brick rubble will do nothing but make matters worse. You need to get the sub-base to dry out.

A properly constructed sub-base will rid itself of excess water, either by draining to ground (assuming the sub-grade is suitably permeable), or via buried land-drainage which provides an escape route from the sub-base to some suitable outfall point for those times when conditions are bad. Once the paving is in place, far less surface water will find its way into the sub-base, so it becomes much less of a problem.

For now, find the lowest point within the sub-base area and dig a sump, which is essentially a deepr hole where all the excess water will collect. From that you either bale out or pump out the excess and get rid. It usually needs around 24-48 hrs without heavy rain for a sodden sub-base to drain and firm-up sufficiently to allow paving to be installed.


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Djcatfood
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Posted: 13 Oct. 2019,20:45 QUOTE

Thankyou so much for the detailed reply and sorry for being impatient I can breath now lol.I had a look underneath the membrane and there is a layer of clay silt underneath. And the mot is sodden wet like you said. A friend offered to bring his mini digger over and scrape the mud out and go to 6 inches of grade one instead of 4.Do you think this is a better option or just leave it to dry out. I was going to chuck some lime in too to speed up the process.
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Tony McC
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Posted: 14 Oct. 2019,07:55 QUOTE

The 'scraping out' and adding more Type 1 will certainly improve matters, but adding lime will lead you towards disaster. A sub-base is intende to be flexible: lime will stiffen it and reduce its long-term effectiveness, so don't do it!

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Djcatfood
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Posted: 14 Oct. 2019,16:03 QUOTE

Thanks tony your a legend!
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