block paving advice

[gwebstech]

Hi there

Im just wondering if you guys generally whack the sand before laying the blocks (and then add a 2nd layer of sand) or only whack after leaving the blocks proud enough to allow for compaction?

Ive been given different advice and wondered if theres a best method?

thanks

 

[^woody^]

If you don't whack it first, you risk uneven compaction once the blocks are down.

We used to whack the bed then fill in any dips then whack again and level it off. Then lift the rails up 10mm, or use a 10mm packer under the levelling board and then sprinkle and float the 10mm bedding layer. I still pass jobs we did yonks ago, and they look as dead flat as the day we did them, no wheel ruts nothing.

 

[dontbelieveawordofit]

i never use sand.

 

[^woody^]

Rebel

 

[dontbelieveawordofit]

cowboy

 

[gwebstech]

i never use sand.

what do you use? ive seen some use ground glass

 

[^woody^]

what do you use? ive seen some use ground glass

LOL. 50 mm of ground glass? WTF

But I suppose ground glass is just grains of sand

 

[dontbelieveawordofit]

what do you use? ive seen some use ground glass

depends whether it’s being driven on or not?

 

[dontbelieveawordofit]

LOL. 50 mm of ground glass? WTF

But I suppose ground glass is just grains of sand

crunch crunch crunch

 

[gwebstech]

If you don't whack it first, you risk uneven compaction once the blocks are down.

We used to whack the bed then fill in any dips then whack again and level it off. Then lift the rails up 10mm, or use a 10mm packer under the levelling board and then sprinkle and float the 10mm bedding layer. I still pass jobs we did yonks ago, and they look as dead flat as the day we did them, no wheel ruts nothing.

so you whacked it all and then leave the blocks 10mm proud you mean? and they whack down to the correct level? id have thought they wouldnt have whacked down that much after all the other compacting

and yes, the ground glass looks just like sand from what i saw

 

[^woody^]

10mm will whack down about 5mm or so, so we would just allow for that when setting up the levels so when all done the surface was where it should be.