Concrete edge blocks - cement?

[NeilScotland]

Hi All,

 

I'm about to lay a 15sq m patio with slabs /tiles. 

The tiles are 90kg each (15 of them). 

I'm edging with a pretty basic edging block (See image). They are 100 x 15 x 4

 

Should I cement these in place or just dig down the relevant depth and then support with the sand subbase I have?

 

thanks,

Neil 

[Gav_P]

11 minutes ago, NeilScotland said:

90kg each

 Crikey! They’ll be fun to lay! 
 

Sorry, I’ve got no advice on the best way to lay those monsters! 

[tonyshouse]

I think that they should go in first and be bedded and haunched with concrete , I think you may mean 1000x150x 40 

Edited November 7, 2020 by tonyshouse
Added bit

[nod]

Your better with a solid base (concrete) with the required fall 

Then lay With a flexible tile adhesive 

[NeilScotland]

OK. clear, thanks.

 

Next question,.... what cement should i buy? ?

[nod]

8 hours ago, NeilScotland said:

OK. clear, thanks.

 

Next question,.... what cement should i buy? ?

Any good quality flexi adhesive 

We normally use Tilemaster 

Less than a tenner a bag 

Manufactured local to me 

[tonyshouse]

OPC or mastercrete for mortars 

[NeilScotland]

1 hour ago, nod said:

Any good quality flexi adhesive 

We normally use Tilemaster 

Less than a tenner a bag 

Manufactured local to me 

Hi Nod,

 

Thanks. are you referring to the tiles or the edgers?

 

I’m meaning which cement option should i use for the edgers. 

 

thanks!

 

 

[NeilScotland]

Thanks Tony,

 

Sorry - i’m a bit new to all this. 

 

I think i need one of these mixes that looks quite ‘stoney’.... corse. if that makes sense?How would i get to that?

 

thanks again. 

Edited November 8, 2020 by NeilScotland

[Declan52]

Unless you have access to a small mixer your best bet would be to get concrete delivered. If you get a fairly dry mix you can use it to form your base plus set the edgings. 

You going to need to have your tile, adhesive bedding, concrete and then compacted hardcore. As for depths your looking at 150mm compacted hardcore, 100mm of concrete, 30mm adhesive. The slabs are 90kg so they are very very heavy so you can't skimp on the sub base or they will sink. 

For hardcore your going to need 5t and concrete 1.7m3. That should be enough to form the base plus have enough to set to edgings and haunch the back. But this all depends on the actual size you finish with plus how level you can get the hardcore and then the concrete. With each step of this process you need to get more and more accurate. After you dig it out you could be 60mm out. After the hardcore maybe 30mm out. After the concrete 10mm out. You don't want to be starting to bed these tiles and find your 50mm out as due to the weight of these tiles it will be very difficult to take that out in the bedding of the adhesive.

 

[Mr Punter]

Those slabs look like an osteopath's dream!

 

I always go with advice from  https://www.pavingexpert.com/

 

[NeilScotland]

Thanks Declan

[NeilScotland]

28 minutes ago, Mr Punter said:

Those slabs look like an osteopath's dream!

 

I always go with advice from  https://www.pavingexpert.com/

 

have a vacuum pump /carrier. Which helps......