I've had a request from a production company about having a roughly 5' x 3' (1.54m x 0.91m) mosaic done onto board.
The pieces will be about 8 - 12mm in size, natural stone. This works out to about 26 kgs per m2, for this size (1.4 m2) = 36.5kg
What could I use as a base board? Bearing in mind...