ARDEX A 29
Rapid Hardening Floor Screed
- Outstanding performance at a true 1:7 mix
- Extended 90 minute working time
- Passes the BRE (ISCR) Screed Test in as little as 24 hours
- Install ceramic tiles in as little as 24 hours and all other floor coverings after only 7 days
ARDEX A 29 cement for floor screeds has been developed to perform in real UK site conditions. Offering unique application and performance benefits to professional screeding contractors; ARDEX A 29 combines excellent workability, speed and performance.
- 90 minute working time
- Walkable after 8 hours
- Passes the BRE Screed (ISCR) Test in as little as 24 hours
- Install ceramic tiles in as little as 24 hours and natural stone after 7 days
- Install resilient and wood floor finishes in as little as 7 days
- Apply as a bonded, unbonded or floating screed
- Can be used with underfloor heating systems
- Can be pumped for fast application
- For internal and external use, including wet areas
Unit Size Available: 20kg
Coverage: 0.27kg ARDEX A 29 cement per m² for each millimetre of screed thickness using a 1:7 mix.
Download the latest datasheets and certificates here;
ARDEX A29 Technical Datasheet (TDS)
ARDEX A29 Health & Safety Datasheet (SDS)
ARDEX A29 Declaration of Performance (DOP)
ARDEX A29 Sustainability Datasheet
ARDEX A29 Environmental Product Declaration (EPD)
THICKNESS
ARDEX A 29 should be applied at the conventional thicknesses for normal cement/sand screeds i.e. Minimum 20mm at 1:5 ratio and minimum 25mm at 1:7 ratio, (design thickness up to 40mm) for bonded screeds. Minimum 50mm for unbonded screeds. Minimum 75mm for floating screeds. 65mm in lightly loaded (domestic) locations.
NOTE: An ARDEX A 29 Screed is suitable for direct application to concrete bases which are insufficiently dry (above 75% RH), direct to
ground or ground supported without an effective damp proof membrane, as well as areas which are subject to rising damp. It is however recommended for projects installing resilient floor finishes such as carpet, vinyl, rubber & wood that the use of a damp-proof membrane is incorporated as follows to protect the finish from moisture in the underlying substrate.
MIX PROPORTIONS
Mix a maximum of 1 part by weight of ARDEX A 29 Cement to 7 parts by weight screeding sand.
WATER
Add sufficient water to obtain a workable mix. With an evenly graded, fairly dry sand, the water requirement will normally be up to a maximum of 11 litres per 20kg bag of ARDEX A 29 (including the water contained in the sand/ aggregate).
MIXING
When a sample of mixed mortar is squeezed in the hand the sample should retain its shape and not crumble, the hand being left slightly
moist. When a sample is compacted on the base, no film of water should form on the surface. Mix to a normal screed mortar consistency. If a mixer is used it should be a pan, trough or other forced action type. Normal ‘free-fall’ mixers are not suitable for mixing semi-dry screed mortars.
Application on a floor heating system:
When an ARDEX A 29 screed has been laid on a hot water floor system, 7 days should be allowed to elapse before heating the water up to a temperature of 25°C and maintained for a further 3 days. The maximum floor temperature should then be used and maintained for a further 4 days. In doing so draughts must be avoided. The floor should then be allowed to cool down to room temperature (above 15°C) before laying floorcoverings.
Working time at 20°C
approx. up to 90 minutes
Note: Apply an ARDEX A 29 Screed at temperatures of 5°C and rising.
PUMPING
It is possible to pump ARDEX A 29 screed mixes using a proprietary screed pump. Contact our Technical Services Department for
further details.
Walkability at 20°C
approx. 8 hours
COVERAGE
approx. 0.27kg ARDEX A 29 cement per m² for each millimetre of screed thickness using a 1:7 mix.
COMPRESSIVE STRENGTH
After 28 days (1:7 mix) 30 N/mm²
After 28 days (1:5 mix) 40 N/mm²
BRE SCREED TEST
Normally after 24 hours
MOISTURE TESTING
Should the moisture content need to be determined the Speedy Moisture Tester (Carbide method) must be used. Please consult ARDEX Technical Services for further advice.