Mosaic finish Design Styles, Chimneys and Finish Discuss Mosaic finish in the Pizza Oven Design and Installation forums; Hi Glenn, I just went and checked on the bag of Portland (as all your formulas are printed on the ...

[nissanneill]

Hi Glenn,
I just went and checked on the bag of Portland (as all your formulas are printed on the bags)
For Structural concrete, 1:2:3 (Cement:Sand:Aggregate)
For paving concrete 1:2.5:3.5
Render 1:4 * I use it 1:3 which makes it a little harder ,stronger and more water resistant. This is the receipe that they used for cement lining of rusted gavanised water tanks year ago. You can add the coloured oxide to taste when mixing which prevents you having to paint the finished surface but you will need around .5 to 1 kg per large wheelbarrow mix of render. Go by the recommendation on the label of the oxide.
Mortar 1:6 + 1 part hydrated lime.

Check on your next bag of cement.

Cheers.

Neill

[david s]

Mixing coloured oxides with grey portland cement results in a rather dull greyish colour. I've found it better to do a coloured layer over the render, but use white cement, sand and oxide. This results in a much better colour.