Grout Formula


Old 01-05-08, 07:28 PM
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Grout Formula

I am grouting a ceramic tile floor in a couple of rooms with 3/8" spacing and I am making my own grout with portland cement, sand, and mineral pigment. My questions are:
1) the ratio of portland cement to sand for grout is recommended as 1:1-1:3, would 1:2 be appropriate for this size spacing?
2) When using a ratio, is it based on volume of material or weight of material?
3) how can I calculate the amount of grout I should mix up? It is important because I need to mix it it all at once for color uniformity.
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Old 01-06-08, 10:15 AM
Join Date: May 2007
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I have never done it and no plans to either but, you should add upto 20% silica to the standard mix for joints wider than 3/8" So I'm not clear if you should add sand for that width.

One thing I do know is that quantities in formulas are ALWAYS stated in volume NEVER by weight. We do not carry scales around!

There are charts for grout coverage, but I don't trust any of the ones I've seen. Too many variables. What size and thickness are these tiles?

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