I will be putting a patio down and was wondering what the calculations would be for measuring how much builders sand and cement I would need to dry grout an area of about 33 square metres using 600 x 600 mm slabs.
Thanks in advance
Dry Grouting Measurements
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84-1093879891
Hi Alan,
the calculation, assuming 12mm joints is.....
nr of flags per m2 X 1/2 flag perimeter X joint depth X joint width
....which gives.....
1200mm x 50mm x 12mm = 0.002m3 per m2
....so for 33m2 you need 0.067m3 of mix.
Using a density of approx 1.9 t/m3, that comes to 125Kg, which, at 5:1 is 21 kg of cement and 104kg of sand.
If you buy a 25Kg of cement and 3 x40kg or 3 x 50Kg bags of sand, that'll allow for wastage. You can safely use a 6:1 ratio for patios, so 3 bags of sand plus a 25kg bag of cement (what we call a 'half-bag') :)
If that doesn't work out, let me know!
the calculation, assuming 12mm joints is.....
nr of flags per m2 X 1/2 flag perimeter X joint depth X joint width
....which gives.....
1200mm x 50mm x 12mm = 0.002m3 per m2
....so for 33m2 you need 0.067m3 of mix.
Using a density of approx 1.9 t/m3, that comes to 125Kg, which, at 5:1 is 21 kg of cement and 104kg of sand.
If you buy a 25Kg of cement and 3 x40kg or 3 x 50Kg bags of sand, that'll allow for wastage. You can safely use a 6:1 ratio for patios, so 3 bags of sand plus a 25kg bag of cement (what we call a 'half-bag') :)
If that doesn't work out, let me know!