Wobble - Laying patio

[Turbina Magnum]

Hi,

have reviewed the 45 large paving stones to find that 9 of them are slighly wobbly.
cheers

Adam

Sorry, you right. I got at first that 45 are wobling :laugh:
And those are stone slabs (with joints), then sure what london says is right.

gess have to read posts more carafully my self :p

[lutonlagerlout]

1 tip that can work if slabs have a slight wobble is if you havent pointed them ,knock up some grout (neat cement and water mixed thoroughly,then using a small jug carefully tip the fluid mixtures into the 2 corner joints where there is movement
dont be tempted to rock it to see just pour it in and let it set overnight
the only slabs that can be laid on unbound m,aterial are council greys
i always use a mix of around 5:1, seen too many patios fail due to lack of £20 worth of cement
LLL

[London Stone Paving]

we had a young lad working for us who was always tight on the cement. Result was that a lot of patios had to be lifted. I dont know why he was so bothered as he was not the person paying for the cement

[pendennis]

Dear community,
I have a wobble question which may need the same advice or different, I'm a beginner at this:
here's the background:

A contractor has just laid about 50 square metres of 600mm square sandstone slabs at my home. The slabs are supported by: (working downwards):
1-2 cm of cement
4-5 cm of sharp sand
approx 7 cmof a purple granular material, which was compacted by machine
under some areas there may be another 7-10 cm of older concrete
The undersides of the slabs were not wetted before laying

On the day after the contractor left I notice one slab near my kitchen door has a wobble. The contractor has been paid. Am I within my rights to call him back to take up and re-lay the slab? Would this cause more problems than it solves? The joint width is only 5-7mm. The main labourer was quite skilled I think but the boss of the company did some of the grouting at the end and has left cement on the slabs. NB slab thickness 12-15mm, quite thin
Any knowledgeable advice appreciated, cheers

[London Stone Paving]

You are well within your rights to ask the contractor back to repair the slab and ask him to remove the mortar from the slabs.

Removing mortar from sandstone should not be too difficult.

Post some pictures of the mortar stains if you can

[seanandruby]

if slabs are wobling slightly and its not sandstone, and taking in to account that there is good bit of them wobling - to save money and time, I would take up all of them, fit screeding bars and screed literarly 3mm of sand on top of area and relay slabs. That way low spots will be covered with thin layer of sand and slabs woun`t woble but good spots gone have only 1-2 mm sand.
Relay seperate slabs is nightmare; If you gone be takeing out seperate slabs, the question is - how you do it without dameging them? With extractor? And if you dont have "trained eye" you be strugling to fit those slabs back in spot as bedding will be low or high and then you have to get them out again.
If it is sandstone, then sure you can relay each seperately.

3mm of loose sand on top of a cement bound material?
Have you got 3mm screed rails?