Ultracolor Manhattan (Light Grey) 110 Flexible Grout 5kg

Provided the tiles are set at a 3mm grout joint, you would require 5.9 kg of grout. So two bags.

You would require 11.6 Kg of grout, so three bags. This has been calculated for consumption using a 3mm grout joint.

We would be unable to answer this without knowing the size tile you plan to use.

This depends completely on the size of the tile you are installing.

Grout consumption depends on a few factors such as joint width, tile depth, wastage, etc, and so varies. You'll need 2 bags, and adhesive consumption depends on the thickness of the layer, but you'll need approximately 7 bags of adhesive for 27m² as one bag can cover a 4m² area.

This grout is flexible and so is suitable for use with underfloor heating.

You would require roughly 12kg of grout.