Joint size for 75x75 floor tile

[D hug]

Very big tiles, was thinking 5mm joint, but it actually looks huge. The tiles don't seem to be very square so I'm not sure 3mm would be enough.
Any tips for slightly out of square large tiles?

Also, thinking 10mm towel with 6mm back butter

 

[Dumbo]

I would use 3mm with them providing they are not sizey . But as you say they are out of square maybe you should lay out a few in a square , im thinking 16 and see wether you think it will work with a 3mm . If not hell me wise joint. 10 mm with a 6mm back butter should be good .

 

[Bond]

10 or 12mm on the floor and 6 mm on the back seems about right. Don’t envy your task if out of square, 3mm might be a bit tight, you might have to size and grade the individual tiles, to achieve best results.

 

[Chris Gibbs]

Very big tiles, was thinking 5mm joint, but it actually looks huge. The tiles don't seem to be very square so I'm not sure 3mm would be enough.
Any tips for slightly out of square large tiles?

Also, thinking 10mm towel with 6mm back butter

if you look on the rear of the tile there should be an arrow. keep these all in the same direction. It sometimes helps if the tiles have a variation as they tend to be bigger or smaller on the same sides if you know what I mean. hope this helps... oh and 3mm if you can.