Installation of Gyvlon Screeds in cold weather
As with all screeds the performance and finish achieved can be affected by the conditions on site at the time of installation, and for a short period of time afterwards.
The temperature for supply of screed mortar in very cold conditions is stated within BSEN 8204-7 (pumpable self-smoothing screeds)
“The temperature of both the base slab and the air in the area where a screed is to be installed should remain in the range of 5°C to 30°C, while the screed is being applied, and subsequently for at least 72h”.
Guidelines for Gyvlon Screed Installation in cold weather
♦ Do not apply Gyvlon screed onto frozen surfaces.
♦ Work should stop at air temperatures of 3°C and falling and can resume again at 2°C and rising.
♦ Ensure the Gyvlon screed is protected from draughts and poured into a watertight location with internal temperatures above 3°C for at least the next 72hrs.
Gyvlon screeds are calcium sulphate based and therefore setting time will not be retarded significantly in the manner affecting cementitious based materials. Therefore, a slightly lower temperature limit may be applied, however, frost / freezing of the screed must be avoided.
Note: Supply of screed mortar below 5°C, will be at the discretion of the screed producer.