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Block paving

Posted by Julie gleed, on
My builder has dug out 200mm of soil and is putting down hardcore is this enough?
Gary McNally

Gary McNally

Hi Julie 200mm is ample enough. If your using 60mm paving for a driveway you want 25-35mm of sand so your left with 115mm of MOT. 4+ inches. Please remember that this is just a guide as ground conditions will play a factor in determining how much MOT is needed & how deep it needs to be.
Mostafa Tavengar

Mostafa Tavengar

Hi Julie, This sounds adequate to me, but I think the answer from Charles Benton below is spot on. So far so good but use his answer to monitor the job as it progresses. I hope it all goes according to plan :-)
Charles Benton

Charles Benton

To Julie, Let me help you with your question you have, This seems the right depth so far but the work is still to go on, I have put this into step - by step for you. - Lay the MOT Type1 Roadstone at a minimum of 100mm after compaction ( two layers at 60mm compacted ) - Layers of Sharp sand will be applied, 1st layer at 50mm then compacted using a Vibration Plate, - A second layer of Sharp sand also to applied with the use of String lines, Screeding rails or a straight edge, - Block paving should always be laid from the bottom of a slope ! - Blocks will be laid higher than desired height, and then compacted down to kerb or border level, - Kiln dries sand to be swept in and also compacted again, vibration plate helping the kiln dried sand to fill the small gaps and making this a solid block paving job. I hope this has helped and reassured you on the job you are having undertaken. Best wishes Benton Landscapes
Tom Fahy

Tom Fahy

Good afternoon, It depends on the use of the substructure and what load it will be carrying cars vans or lorries Usaly I excavate to 300 mm the lay road stone and compacked followed by a layer of crushed concrete mot, You can view diagrams showing the correct built up at pavingexpert.com Kind regards Bespoke contractors LTD
Mark Gaskin

Mark Gaskin

Hi Julie The answers are all completely different be cause of different areas if it is for a patio then it will be fine but if it is for a drive way then the answer is no it is not deep enough A driveway must have at least 225 mil of hard-core +40 mil screening Sand and 50 mil block I hope this helps you mark
jim rutherford

jim rutherford

i would dig out a 100mm more as minimum should be 150 hardcore 40mm screed,50mm block the more hardcore the better.
Gary Finnie

Gary Finnie

Hi Yes this is more than enough. I assume this is for your driveway? It is generally a minimum of 150mm of hardcore for heavy foot fall area or driveway and 75mm hardcore for light foot fall paths. He should compact the hard core every 75mm prior to topping with sharp sand and compacting again.
Benjamin Macann

Benjamin Macann

Hi there Julie it depends how deep you go and the quaitly off the hard core and the ground you are laying it on .
David Price

David Price

depend on the soil underneath with stable ground 200mm is more than enough you would be looking for a minimum 100 mm on stable ground

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