In common with other screeds it is very important that good drying conditions are provided as soon as it is appropriate.
For Gyvlon screeds adequate protection from rapid drying or draughts should be provided for the first 48-72 hours. Thereafter the relative humidity of the building should be low to allow moisture release from the screed and facilitate drying. Failure to provide the desired conditions can prolong screed drying times considerably and may lead to delays in the construction schedule.
FLOW SCREED DRYING TIME
Under ideal drying conditions (a warm, well ventilated room) Gyvlon Screed dries at a rate of 1mm/day up to a thickness of 40mm and then at a rate of 1⁄2 mm/day for thicknesses above this.
50mm Gyvlon Screed Drying time: (40mm*1 day) + (10mm*2days) = 60 Days (2 months)
The above example is for guidance only.
Drying times can be reduced by the provision of good ventilation, open windows and doors in good weather, removal of laitance as recommended, the use of dehumidifiers and by force drying of the screed using under floor heating.
Dehumidifiers can be used as early as 72 hours after the placing of Gyvlon Screed to assist with drying. It’S important that a closed system is employed. This is done to ensure that any moisture extracted from the environment during operation is removed. Any water collected should be removed regularly.
Force drying of a Gyvlon screed can begin as early as 7 days following installation of the screed by various methods. Commissioning (heating & cooling procedure) of under floor heating systems.
Set the flow temperature to 20-25C, maintain for a minimum of 3 days. Then gradually increase the temperature in a maximum of 5oC increments to maximum operating temperature. This should be maintained for a further 7 days (water temperature should not exceed 55oC for screeds), prior to returning to ambient temperature again in Max 5oC increments.
SPACE HEATERS & DEHUMIDIFIERS IN COMBINATION
Fossil fuel fired heaters (E.g. gas heaters) must be avoided as they will raise humidity.
SPECIALIST DRYING MECHANISMS
These include vacuum dewatering, cocooning and microwave technology. These procedures should only be carried out by specialist contractors.
After drying the screed, the residual moisture content must be determined using one of the approved test methods to demonstrate suitability for acceptance of floor finishes.
NB: Drying of screeds and can be greatly influenced by individual site conditions.
You can view our liquid flow screed technical specifications here.