ANSERGLOB LFS 73

Substrate preparation is carried out according to DSTU-N B A.3.1-23:2013, SNiP 2.03.13-88 and DSTU-N B V.2.6-212:2016. The substrate must be strong, dry, cleaned of dust, dirt, lime, grease, oil-based and emulsion paints. All weak areas must be thoroughly removed. Cement surfaces must be cleaned of cement laitance using a steel brush or sandblasting equipment to improve adhesion of smooth surfaces. Cracks in the substrate must be widened, treated with one of the ANSERGLOB deep-penetrating primers, and sealed with ANSERGLOB LFS 69, ANSERGLOB LFS 70 cement screed, or floor leveling compound ANSERGLOB LFS 73 gypsum-based. Highly absorbent substrates must be treated with one of the ANSERGLOB deep penetration primers before work and allowed to cure for 4 hours. Low-absorbent substrates must be treated with ANSERGLOB EG 62 or ANSERGLOB EG 63 BETON KONTAKT primer and allowed to cure for 3–6 hours. The floor must be separated from contact with load-bearing and enclosing structures by means of an elastic layer (foamed polyethylene, thin expanded polystyrene). If the monolithic floor may be exposed to moisture from below, a separate waterproofing layer must be used across the entire application area; in this case, the minimum thickness of ANSERGLOB LFS 73 must be 35 mm.

In case of machine application mortar is fed by mixing aggregate (plastering station or mortar pump). In case of manual application 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. When laying ‘floating’ floor thickness is 40 mm as minimum. When using in floor heating systems, the layer thickness must be on 25 mm higher than the upper edge of the heating pipe, the system must be filled with water until the screed is fully dry. 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 1%) further work 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. Before overcoating surface must be sanded.

Note: Strength of bed must be not less than M 150. 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 1,6 kg per m2 at 1 mm layer thickness.

For machine application, the dry mix is mixed in a plastering unit with the water flow set to approx. 0.23 L/kg. For manual application, dry mix must be poured into a container with clean water at a rate of 0.18 – 0.22 L of water per 1 kg of mix (4.14 – 5.06 L of water per 23-kg bag) stirring manually or mechanically using a low speed drill mixer until a homogeneous, lump-free mass of the required consistency is obtained. Allow the mixture to stand for 5 minutes, then remix it, after which it is ready for use within 30 minutes. Excessive water leads to the deterioration of the compound's properties, reduces its strength, and may cause segregation.