20mm stone paviours outside.

[Flintstone]

I can talk to you about Dijon mustard if that's any help?

 

[Blunt Tool]

It'll be a dry mix wetted!

It was Mandarin Stone I laid, hammered finish limestone, 5mm joints laid into 24:1 sharp sand and cement, semi dry with SBR slurry done in stretches. The grout was hand made soft washed sand, snowcrete and yellow colouring. I sprinkled water into the joints then soft brushed the dry mix into joints, then compacted with trowel. The mix pulls the water up then after a time pointed and brushed away excess.

 

[Old Mod]

Do you know why it was spec'd that way John?

 

[Blunt Tool]

Stone supplier has recommended fitting their 20mm (900x600) stone outside on a 50mm sand/cement bed over hardcore. Sbr slurry on the back to reduce staining.
Anyone believe this is a correct method of installation or what are your alternatives.
Your thoughts please.

Forgot to say regards the hardcore, I got the contractors to roll it tight, then put in a 1 inch bed of sharp sand raked and rolled tight then dampened and used building paper!

 

[J Sid]

It was Mandarin Stone I laid, hammered finish limestone, 5mm joints laid into 24:1 sharp sand and cement, semi dry with SBR slurry done in stretches. The grout was hand made soft washed sand, snowcrete and yellow colouring. I sprinkled water into the joints then soft brushed the dry mix into joints, then compacted with trowel. The mix pulls the water up then after a time pointed and brushed away excess.

I would do a much stronger mix for the sand and cement 10 or 8 : 1

 

[Blunt Tool]

I would do a much stronger mix for the sand and cement 10 or 8 : 1

Be too strong for semi dry too much cement and will make it brittle, and more likely to ball

 

[J Sid]

that was the mix we used years back for warehouse floors mainly, taking heavy traffic.
but surely how well the mix was bedded / compressed when fitting the tile / stone has a big influence on how strong or brittle the cured sand and cement mix will be.

 

[J Sid]

if you over wet it , yes very likely to ball in mixer

 

[Blunt Tool]

Served half my time with pile of sharp sand, bags of cement, mixing board, barrel of water and a shovel for Toffolo Jackson. Don't know how many tons per day me and another apprentice mixed and carried. But tradesmen were scary guys back in that days and if they said 24 shovels to 1 bag cement guess what we mixed? Stuck with me all my life and never mess with it and never let me down 🙂

 

[J Sid]

what was being fixed on top?
factory floors or outside paving?