Self-leveling screed ANSERGLOB LFF 74 is used for finishing laying and leveling of concrete, cement-sand and stoned beds in commercial and civil buildings, warehouses and staircases and etc. Cured screed meets the requirements of finishing floors and can be used under various coatings, such as linoleum, carpet, laminate, parquet, ceramic tiles, natural stone and others. Screed ANSERGLOB LFF 74 is suitable for floor heating systems.
The surface preparation is realized according to State Standard of Ukraine (DSTU N B A.3.1-23:2013) and State Building Codes of Ukraine (SNiP 2.03.13-88 and DSTU N B A.2.6-212:2016). Surface must be structurally sound, clean, dry and free from dust, grease, dirt, lime, wax, oil or emulsion paints. Before applying screed fragile areas of substrate must be thoroughly removed. Cement surface is cleaned up from laitance by wire brush or sandblaster. Thus, it allows to increase adhesion of smooth surfaces. Cracks in the beds must be expanded and treated by one of deep penetrating emulsions ANSERGLOB and filled with ANSERGLOB LFF 74 or ANSERGLOB LFS 73. Before applying substrates with strong sorption must be treated by one of deeply penetrating emulsions ANSERGLOB and exposed for 4 hours. Before applying substrates with low sorption must be treated by ANSERGLOB EG 62 and exposed from 3 to 6 hours. Insufficient quality of preparing work can lead to delaminating or cracking of the laid layer.
Prepared screed mortar is poured on bed and spread on the surface with feather edge, wide spatula or other tool. For removal air bubbles from the mortar it is required to provide deaeration using rigid spiked roller. In order to feed solution piston or screw pump can be used. All works on the preparation, spreading and smoothing of each portion of mortar should be carried out for 30 min. At breaks in work more than 30 min tools and equipment must be cleaned from mortar and washed with water. Cured mortar can be removed only in mechanical way.
When applying mortar and during curing to prevent cracking it is required to avoid of draught and fast drying of screed. Depending on the curing conditions, application thickness and residual moisture of bed (not more than 4 %), further works should be done not less than after 3 days for the installation of ceramic and stone tile and 7 days for laying parquet, linoleum and carpet.
Note:Strength of bed must be not less than next layer.
Application should be complied at temperature above +5°С and below +30°С. All the mentioned recommendations are effective at temperature of +20°С and air humidity of 60%. Under the other conditions crusting, stiffening and curing time may be changed.
Average consumption of the mixture is 1,7 kg per m2 at 1 mm layer thickness.
Dry mixture must be poured into container with clear water according to ratio 0,18-0,20 liters of water per 1 kg of mixture (4,5 – 5 liters of water per 1 bag of 25 kg) when at the same time manually or mechanically mixed (by the drill on low revs) to obtain the kindred and elastic mass. After exposing 5 min mortar must be mixed again and can be used. Excess quantity of water leads to reducing quality, decreases strength and can lead to delaminating that is unacceptable.