Laying tiles on wall bonding pattern

[NeilAJF]

Hi,
I have 600x300mm Tiles to go on the floor and walls and was intending on laying them in a Stretcher Bond pattern. Now I have bothered to look at the boxes I see a diagram showing NO to a 50/50 stretcher Bond but OK to an offset more like 70/30.
Any of you fine people out there have any idea why no equal bond....They are 9mm thick and made for floor and wall.
Thanks for any info.

 

[pete f]

It's probably to do with the tile being warped a bit so they state 33% bond to eliminate lippage tolerance

 

[Hobnob]

As per post above.
Some tiles are poorly cooled / fired and they warp. Place 2 tiles face to face and pinch one end, you will probably find a sizeable gap at the other end. You will need to minimise the joint offset to attempt to flatten the tiled surface.