Light coloured granite sets & cubes - White portland cement bedding mix.

[markoregan]

Hi again lads,
I was wondering if anyone reccomends using a white portland cement for a bedding mix for light coloured granites. When laying thin tile a white flexible adhesive is required in order to prevent any impurities in the darker adhesives showing through on the face of the stone. I was wondering if the same principle applies to flags and cobbles. I would imagine it might only apply to thinner flags rather than cubes as the impurities would have a longer distance to travel in the cubes and would probably never see the light of day. Any thoughts would be much appreciated.
Thanks,
Mark.

[simeonronacrete]

We manufacture a range of thin bed tile adhesives and colour grouts, which are used, not surprisingly, for bedding and grouting tiles. A different grade is available for thicker bed mortars.

Yes, white is available, and for the reasons you have stated. Colour is very much a personal preference, and recognising the customer is always right, we have to make all available.

The components include white cement and very pure white sands.

Regards

[markoregan]

Thanks Simeon,
I dont suppose there is any hard and fast rule on the thickness of stone required to prevent any impurities showing through. Since the physical and mechanical properties of granites vary a great deal I dont suppose anyone has come up with a generic chart that links the porosity and absorbtion of stone to impurity migration. As a general rule the more quartz that is in a stone the lighter it is in colour and the more porous it is.If this sounds like a load of "B" ignore it.
Mark.

[simeonronacrete]

Well we haven't, and I don't know if anyone has. Maybe if it exists you / we will learn of it through this site.

Sounds like an interesting job for someone with plenty of time on their hands.

[markoregan]

Thanks Simeon,
I reckon if a guru like yourself hasent heard of it, it probally doesent exist. Mind you I would like to hear what Tony Mac has to say, going through this site he seems to have a direct link to the paving gods.
Mark.

[simeonronacrete]

Mark

I don't know if it's fair on genuine guru's to describe me as a guru, but I appreciate the compliment.

[Tony McC]

It's difficult for me to comment on this subject just at the moment because of something that's happenning offline. Until this real-life "issue" is resolved, I could get meself into all sorts of trouble if I say the wrong thing on a public forum.