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I know it's a terrible time of the year to attempt this, but ideally I need to tile a 12sq m patio before Christmas. I have already laid Ditra 25 and plan to fix the tiles with Keraflex S1 Maxi. But! When I check the instructions for the https://www.tilersforums.com/forums/tile-adhesive/, they warn against tile during frosty conditions so I am wondering what my options are. If I add a frostproofing agent to the mix, will it reduce the effectiveness of the https://www.tilersforums.com/forums/tile-adhesive/ because in particular I need to retain the deformability and flex that the S1 mix offers. Any other suggestions? Thanks in advance.