SikaBond®-T21 is a one-component, low VOC, permanently elastic, super strong, very low permeability moisture-cure polyurethane adhesive, vapor retarding, crack bridging and sound reduction membrane all-in-one for full surface wood floor bonding.
- 270 % elongation
- Bonds up to 3/4" solid and engineered wood
- Extremely easy to trowel
- Crack bridging
- Low odor
- Excellent Green Grab
Color: Light Brown
Consistency: Spreads very easily
Ambient Air Temperature
Room temperature between 60 °F (15 °C) and 90 °F (35 °C). For ambient temperatures the standard construction rules are relevant. Follow all wood floor manufacturers’ acclimation and room temperature requirements.
Relative Air Humidity
Between 40 % and 70 % during installation is best for adhesive. See wood floor manufacturer for wood requirements.
During laying and until SikaBond®-T21 has fully cured, substrate temperature should be greater than 60 °F (15 °C) and in case of radiant floor heating, less than 70 °F (20 °C). For substrate temperatures, the standard construction rules are relevant.
Substrate Moisture Content
For use as an adhesive and moisture membrane:
Concrete must be visibly dry. Inspect for any wetness at base of drywall or visible signs of moisture on concrete. Concrete and cement-based underlayments must be fully cured and free of any hydrostatic and/ or moisture problems. When properly applied in accordance with Sika® guidelines, SikaBond®-T21 provides unlimited moisture vapor protection.
For use as an adhesive only:
SikaBond®-T21 is not affected by moisture or vapor transmission. For protection of the wood, follow the wood floor manufacturer’s requirements for subfloor moisture. If substrate is not acceptable, use SikaBond®-T21 at recommended coverage rate as All-in-One or Sika® MB. See Technical Data Sheet for proper instruction.
Floor may accept light foot traffic after:
- at 45–50 SF/gal (P5 trowel): after 6–8 h
- at 30–35 SF/gal (SC+MB trowel): after 12 h
(depending on climatic conditions and adhesive layer thickness)
Floor can be sanded after 18 hours
Skin Time / Laying Time
~ 45–60 minutes
(at 73 °F (23 °C) and 50 % R.H.)
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