Need to lay hardcore - which one shall i order

[e39boy]

Hi,

I am planning on laying hardcore myself before getting concrete poured for a self build extension.

Which MOT should i be ordering?

 

[Wayners]

Type 1 subbase.
Crushed concrete is sometimes called Type 1 and cheaper

 

[Murdochcat]

Has the bco inspected the depth you have dug to?

 

[Cheslea2010]

Type 1. Make sure it is certificated as a lot of the recycled options are only "Type 1 Graded"

 

[noseall]

Hi,

I am planning on laying hardcore myself before getting concrete poured for a self build extension.

Which MOT should i be ordering?

I take it this is for the over-site?

MOT type1, 40mm - dust.

 

[stevie888]

You don't need anything too exotic. Not so long ago good old hardcore was all we used and that does the job just fine but takes a bit of time and care to properly compact, so now the line is usually type 1. It just needs to be solid.

All "type 1" means is a grading of a suitable aggregate. The traditional materials are limestone or granite dependant on location but we used to use a lot of blast furnace slag in Kent back in the day from Dunkirk. Nowadays crushed concrete or crushed hardcore are frequently used and indeed the later was found to perform better than the "proper" stuff when we used both under a roundabout in Essex a few years ago.

 

[Ivor Windybottom]

I did my shed floor with crushed demolition waste, it was about half the price but just as good at its job and it all bound together really nicely when compacted but without the clouds of white dust you get from limestone MOT.

I kept a bucket alongside where I was shovelling it up, and pulled out anything non-rocky. Just the occasional splinter of wood or bit of plastic. I ended up with half a bucketful from about 15 tons. At this sort of percentage it would have made zero difference to its strength if I hadn't been so fussy.