DCI RAPID EXTRA is a C2FTES1 class cementitious (C), improved (2), fast setting (F), extended open time (E), slip resistance (T), deformable (S1) adhesive. DCI RAPID EXTRA can be used on walls and floors for thin bed and medium bed installations of tiles and stone material.
Field of Application
• For interior and exterior use
• For floors and walls
• Suitable for swimming pool
• For thin-bed and medium bed installations of all types of tiles
• Suitable for installation of large format tiles
• For thicknesses up to 20 mm
• Suitable for application over waterproofing products like Seal Master, Seal Master Elastic, Aquaprotect, etc.
• Suitable for floor heated substrates
• For heavy-duty and high traffic areas
• Over the existing wall and floor tiles
COVERAGE / CONSUMPTION
Preparation of the support
The support must be totally dried, mechanically hard, free of oils, grease, wax, paint, and lose particles. All substrates must not be subject to shrinkage after the installation of the tiles. During the spring and summer period, renders must be cured for at least one week for every centimeter of thickness, and cement screeds must be cured for at least 28 days unless they have been made with DCI special binders for screeds such as Screed80, Level S10, or with Level S30. Gypsum substrates or anhydrite screeds must be perfectly dry (max. residual moisture 0.5%), sufficiently hard, and free of dust. They must be treated with DCI Grip Primer or Beton Contact, while areas subject to high humidity must be treated with PRIMER CTA.
Preparing the product
DCI RAPID EXTRA must be mixed with clean water until obtaining a homogenous mixture. After 5-10 minutes of resting, the mix should be mixed again. After this, the product is ready to be used. The water demand to be used is approximately 29-31% of DCI RAPID EXTRA (equal to ca. 7.25-7.75 liters of water). The mixture, produced in this way, is workable for at least 4 hours.
Applying the product
DCI RAPID EXTRA is applied with a notched trowel onto the substrate. Choose a trowel that will give coverage to the back of the tiles at least 65-70% for walls or indoor light foot traffic. For heavy traffic, the coverage must be 100%. To obtain good adhesion to the substrate, the following system is recommended: first, apply a thin coat of DCI RAPID EXTRA using the smooth side of the trowel and immediately after applying the desired thickness of DCI RAPID EXTRA using the toothed side of the trowel.
Installing the tiles
It is unnecessary to wet the tiles before installation; however, the backs are very dusty, they should be wiped in clean water. The tiles are installed under firm pressure to ensure good contact with the adhesive. DCI RAPID EXTRA open time in normal temperature and humidity is 20-30 minutes. Unfavorable weather conditions (high temperature, strong sun, drying wind) or high absorbent substrate may shorten the open time and, in some cases quite drastically, to just a few minutes. For this reason, there should be continuous controls to see if the adhesive is still fresh to the touch or has formed a surface skin. Should a surface skin have formed, the adhesive should be re-troweling. It is inadvisable to wet the adhesive when it has formed a skin because a non-adhesive film will be formed instead of dissolving the skin. Adjustment of the tiles, if necessary, should be carried out within 60 minutes following installation, after which time adjustment will become problematic. Tiling installed with DCI RAPID EXTRA must not be subject to rain for at least the first 24 hours and must be protected from frost and direct sun for at least 5-7 days after application.
Applying the grout
The grout installation can be done after a minimum of 8 hours curing time at 23°C and 50% relative humidity for walls and after a minimum of 24 hours curing time at 23°C and 50% relative humidity for floors. Conditions may change the setting and curing time significantly.