Mapei Ultracolor Plus Medium Silk - 5kg

Coverage depends on your tile size and joint width, but as a guide, 1kg of Mapei Ultracolor Plus Medium Silk covers approximately 1.33m² when grouting 100mm x 100mm x 8mm tiles with 3mm joints. A 5kg bag therefore covers roughly 6.65m² at those dimensions. For larger tiles or wider joints, coverage will vary, so it is worth calculating your total joint area before ordering to make sure you have enough.

Yes, Mapei Ultracolor Plus Medium Silk is confirmed as suitable for use with underfloor heating systems, making it a great choice for heated bathroom and kitchen walls. Its anti-efflorescence formulation also helps maintain a uniform Medium Silk colour even with the temperature fluctuations that underfloor heating can cause. Just ensure the heating system is switched off and the subfloor is at a stable temperature before grouting.

Once mixed, Mapei Ultracolor Plus Medium Silk has a pot life of 20-25 minutes, so it is important to work efficiently. The grout is ready for light finishing after 15-30 minutes, and the surface can handle light foot traffic after approximately 3 hours. For a bathroom or kitchen wall application, we recommend allowing a full cure before exposing the grout to prolonged water contact – refer to the Mapei data sheet for full guidance on cure times.