What you need to know about drying times

What you need to know about drying times

First 24/36 hours

Ensure ALL openings are closed for the first 24 hours, then open windows to allow moist air to escape. Don’t walk on floor for 24/36 hours after liquid screed has been laid.

Drying Times

Forced Drying: Unlike cement based screeds, calcium sulphate screeds can be force dried by commissioning the underfloor heating system after seven days of the floor being laid (if applicable) or by using a dehumidifier.

Commissioning Underfloor Heating

Seven days after installation of the liquid screed, the underfloor heating commissioning process can start. Set the flow temperature to 20-25º C and maintain this for a minimum of 3 days. Then gradually increase the temperature in 5ºC increments to the maximum operating temperature (not exceeding 55oC) and maintain this for a further 7 days. Then gradually reduce the temperature in 5ºC increments to an ambient temperature.

In ideal drying conditions (a warm, well ventilated room) Gyvlon Screed dries at a rate of 1mm per day up to a depth of 40mm and then at a rate of ½ mm per day for any additional depth.

Example: 50mm liquid screed drying time: (40mm x 1 day) + (10mm x 2days) = 60 Days (2 months).

NB: Drying of screeds and can be greatly affected by individual site conditions. The above example is for guidance only.

Prior to tiling

The screed will need to be tested for moisture prior to application of coverings Please ask for more for details. Ensure the screed is sanded to remove loose surface laitance and to create a surface key, prior to application of primers and sealers for tiling. Please contact us to book sanding if required, allowing a minimum of 3 weeks drying time.

The UFH system needs to be commissioned prior to tiles, timbers or vinyl based products being applied. UFH should have been turned off for minimum 24 hours prior to priming. Prime the screed using either an acrylic or water based epoxy primer prior to application of levellers or adhesives (NOT PVA). After installation of floor covering, UFH should be implemented at a steady temperature. Whilst cement based adhesives are most commonly used in conjunction with liquid screed, gypsum based adhesives are more compatible, faster drying and cheaper.