A special cement used in place of Portland Cement in cement: sand screeds for producing a rapid setting and drying floor screed that can be used as a bonded screed, an unbonded floor screed laid onto a membrane, or a floating screed laid onto compressive quilt or insulation material. It will be dry after 24 hours at 20°C to receive floor finishes, regardless of thickness.

Features and benefits:

Walkable in three hours.
Receives ceramic and natural stone tiles directly after 24 hours.
Install carpet, wood and vinyl floorcoverings after 24 hours, or just, four hours for carpet and vinyl when smoothed with ARDEX A 55.
Passes BRE Screed (ISCR) Testing after six hours.
After just one day, achieves the acceptable minimum compressive and tensile bending strengths attained by an ordinary cement screed after 28 days.

Screed thickness:

The following thicknesses are recommended for screeds using ARDEX A 35:

Bonded screeds: Minimum 15 mm (design thickness up to 40 mm).
Unbonded screeds: Minimum 50 mm.
Floating screeds: Minimum 75 mm (minimum 65 mm in lightly loaded (domestic) locations).
Screed repairs: Can be applied to the full thickness of the existing cement/sand screed.

Mix proportions:

Heavy duty: A 1:4 mix is recommended where a very heavy duty floor is required.
Standard: A 1:5 mix is recommended for all normal screeding situations.

ARDEX A 35 Environmental Product Declaration (EPD)