Which tile adhesive?

[ben100]

Which tile adhesive should I use for 60x60cm porcelain floor tiles? The floor is concrete that has an area that has been self levelled & there is a small section that has floorboards. I was thinking to use a flexible adhesive? Also which size trowel would be better for this large of a tile?

 

[davidjohnsir]

I think 12mm notched trowel would be fine. And for the adhesive thing I am sharing this with fellow mate. Will reply if something comes up. Thanks