Extended Set flexible adhesive Pro Flex SP+ES. Covers 5m 2 when installing insulation boards. Covers 2.5m 2 per bag over underfloor heating. Ultra Tile Pro Flex SP+ES is a single part, standard set, flexible adhesive for wall & floor tiles. It is specially formulated with. Extended workability for large format & intricate porcelain, ceramic & natural stone tile work, with exceptional adhesion & flexural capacity, that is ideal for situations where vibration may occur. A polymer modified adhesive for increased bond strength & enhanced performance. The adhesives unique qualities make it ideal for fixing tiles to most common building substrates including sand/cement render, screeds, brick & block work, heated subfloors, existing tiled surfaces & overboarded wooden floors (for substrates with greater movement or vibration refer to Ultra Tile Pro Flex 2part). Ultra Tile SP+ES is perfect for interior, exterior, wet & dry conditions, such as conservatories, showers, saunas and