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PostPosted: Sun May 13, 2018 3:56 pm 
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Hi guys,

I've got to re-bed some slabs in the front garden. The ground below (old concrete path) is sloping, but the level of the finished slabs is flat so the bedding thickness varies from 30mm to 70mm. The only way I could work out the amount of sand and cement I would need was to work out the volume of the finished area. I then deducted the volume of all of the slabs that need re-bedding. This should leave me with the bedding mortar and grout total volume. The figure I have is 0.37 M3. I want to use a 4:1 mix of sand and cement, but I am having difficulty working out how much of each for 0.37 M3 area. So how many bags of sand and cement would I need?

Thanks, I should have listened more in maths class... :D


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PostPosted: Sun May 13, 2018 5:46 pm 
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:dunno: But i know a place that does. Click here

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PostPosted: Mon May 14, 2018 6:55 am 
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Not an exact science because most mixing done by shovel load. 4 sand to 1 makes quite a hard concrete mortar, not necessarily stronger; if you are buying by the 25Kg bag and not as say 1/2 yard sand then about 20 bags sand and 5 cement but 4 cement would be about 5:1.
If the supply is local and you don't intend to do the job in one go, then you can buy less and add so that you don't have left over or shortage, especially if you are using a car to pick up the load as too heavy for one trip.


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PostPosted: Mon May 14, 2018 8:12 am 
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Thanks guys,

I'll probably be hiring a mixer for this and doing it in the evenings and weekends over a week. The 4:1 mix was my father's idea and comes from his plastering days and outside rendering. I've rendered with it and it seems a nice comfortable and workable mix. He also said to put some tacky PVA on the back of the slabs for a better adherence. Again, that's the plasterer's techniques coming out.

I really just wanted a ball park figure to start off with so 20 bags of sand and 5 cement is what I'll initially get. I have other projects I can use any leftovers on.

Thanks for all your help. :)


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