Size of notched trowel for 300x600mm uncalibrated slate?

[Scotiansailor]

Hello, newbie here once again, trying to determine the best size of notched trowel for spreading adhesive for 300x600mm uncalibrated slate on our floor? Will be laying on a new concrete screed. Thanks for the help 🙂

 

[Dave]

Hello, newbie here once again, trying to determine the best size of notched trowel for spreading adhesive for 300x600mm uncalibrated slate on our floor? Will be laying on a new concrete screed. Thanks for the help 🙂

Morning, 12mm and back butter the slate for a good solid bed. The slate might be fairly dusty from manufacturing process, so a wash of the backs to remove contamination might be required. Don’t forget to work with the thickest pieces first and the thinner last.
Have you checked the screed is cured sufficiently etc.

 

[Scotiansailor]

Morning, 12mm and back butter the slate for a good solid bed. The slate might be fairly dusty from manufacturing process, so a wash of the backs to remove contamination might be required. Don’t forget to work with the thickest pieces first and the thinner last.
Have you checked the screed is cured sufficiently etc.

Thanks again, Dave! Yes the screed was poured in October. Even in this colder climate (Hebrides, Scotland) surely it is cured by now!