T
Tile Shop
Nerd alert!!! INCOMING!
Based on the CoLTE of porcelain (4 in general) if a room is 20oC normally and the temp rises to 30oC when the bathroom, underfloor heating or whatever is in use, a 2400x1200 porcelain tile will expand to 2400.096 x 1200.048mm. Would that 0.096 x 0.048 of a millimetre make a difference? 1mm joints might struggle to buffer it, maybe.... but 2-3mm with flexi grout, flexi adhesive and appropriate expansion joints, shouldn't cause much of a problem but that also depends on their deformability.
Also need to bare in mind whether or not the substrate is subject to the same temperature fluctuations and how much they are likely to expand. for the same amount of plaster (2.4m) for example it will expand by 0.408mm.
IMO British standards are a little on the safe side, but not massively. I can see why they thought a need to amend. But the trouble is all the manufactures say their products are only guaranteed if used in line with the current standards. Ultimately if anything goes wrong, the tiler gets the blame, whether they were/weren't aware of the requirements or someone else requested it.
Based on the CoLTE of porcelain (4 in general) if a room is 20oC normally and the temp rises to 30oC when the bathroom, underfloor heating or whatever is in use, a 2400x1200 porcelain tile will expand to 2400.096 x 1200.048mm. Would that 0.096 x 0.048 of a millimetre make a difference? 1mm joints might struggle to buffer it, maybe.... but 2-3mm with flexi grout, flexi adhesive and appropriate expansion joints, shouldn't cause much of a problem but that also depends on their deformability.
Also need to bare in mind whether or not the substrate is subject to the same temperature fluctuations and how much they are likely to expand. for the same amount of plaster (2.4m) for example it will expand by 0.408mm.
IMO British standards are a little on the safe side, but not massively. I can see why they thought a need to amend. But the trouble is all the manufactures say their products are only guaranteed if used in line with the current standards. Ultimately if anything goes wrong, the tiler gets the blame, whether they were/weren't aware of the requirements or someone else requested it.