Bedding layer thickness? - Is 75mm thick bedding layer a problem?

[FrenchyIII]

Advice needed please -

I am laying 25mm thick paving (60x40 and 40x40) that will but up to existing slabs and therefore need to match up with existing levels. The current level of the sub base in the new area leaves me with the need for a 75 mm thick bedding layer. This website recommends a 30-50mm thick bedding layer.

Is there any problem in simply using a normal 10:1 mix (dry) to create a 75mm thick bedding layer or should I try to add another 25 - 35 mm of sub base?

Alternatively could I simply spread 25-35mm of sharp sand and then the recommended mix (10:1) above that as the bedding layer?

The area is for foot traffic with a rare risk of a ride on lawn mower running over it as the heaviest form of traffic.

Total area is about 50 m2
thanks
FrenchyIII

[seanandruby]

thats way too deep for that thickness of paving. bring your sub base higher.

[FrenchyIII]

Probably a stupid question - but why is it "way to deep"?
What would be the consequences? (apart from more mixing and expense)

Would it help if I added steel reinforcing mesh?

[topgrafter2007]

more mixing and expense for sure. just build up base layer in mot small type if available then compact with wacker. then lay your fags on recommended depth of bedding layer. quicker and easier and cheaper!

[msh paving]

steel will be a waste off money MSH

[FrenchyIII]

OK - thanks for the fast responses - I get the message - increase the height of the sub base it is.

looks like 2 deliveries rather than just the one of sand.

[oioisonnyboy]

OK - thanks for the fast responses - I get the message - increase the height of the sub base it is.

looks like 2 deliveries rather than just the one of sand.

why??

topping up the sub base with sand is not a good idea. sub base under paving should be type 1 material.

if you are buying it in bulk bags type 1 will be probably £5.00 dearer than sand. for the sake of a deep sea diver, you should get type 1 and just use the sand for your bedding layer, of approx 30-50mm

hope this helps

[oioisonnyboy]

in answer to your earlier questions monsieur frenchy

steel is only needed where concrete is to be structural in some way shape or form. for a bound sub bse its not necessary, and would probably be more trouble than its worth.

thickness of bedding layer - 30-50mm is ideal. Go any thicker and it will cost you more money for more sand and more cement. In this case your path is only for light use, the flags are fairly light (25mm) so 50mm bedding is plenty

[FrenchyIII]

Merci oioisonnyboy

the main reason I was considering steel mesh was to help keep edge flags level in event of movement of the surrounding ground which slopes down away from the area to be paved (quite steeply on one corner)

I will be haunching as well but thought the mesh would be added insurance. Also as it is normal to have a reasonable thickness of concrete above and below reinforcing I thought that the 75mm depth would accommodate this (with the mesh at the mid point).

Just as an extra I will be adding fibre (fibremesh 300) to the mix although I know this doesnt add much in the way of strength but I happen to have this available.