limestone

Hello, Thank you in advance for all who will take time to support! I am planning to install patio grid in my garden to give some firmness to my heavy clay soil. Now I understood I need to dig around 150mm and put around 70mm hard subbase 40mm of Sharp sand and the 40mm of the grid filled...

Wondering if you tilers could advise please? I will be laying a kitchen floor, 28sqm. Tiles are limestone, 600x400mm. 12mm thick. What would be The recommended trowel notch size for these tiles? I intend to stick a decoupling mat on the screed first, as I’ve got wet ufh. Would a 6 or 8 mm...