Special cement-based, fast setting and drying floor screed for castings, fillings and slopes at thicknesses 5-100 mm in interior areas. Suitable for interior and exterior use. Carefully floated surface is suitable for waterproofing. For finishing the floor prior to floor covering we recommend Kiilto levelling compounds, if needed. The concrete substrate must comply with national standards. (In Finland SisäRYL 2013 and BY 45).
1. Bonded floor/firm concrete subfloor or building board: The substrate must be clean, solid and firm. Remove cement laitance, paint splashes, adhesive residue and other impurities and brush or vacuum the floor thoroughly.
Concrete subfloors are pre-treated with diluted Kiilto Start Primer (10–20% primer/80–90% water) prior to application of the floor screed. With building board subfloors, use Kiilto Start Primer undiluted.
In outdoor applications and with non-absorbent substrates prime the substrate with Kiilto Fix Primer or make a bond bridge with, e.g. Kiilto Saneerauslaasti cementitious adhesive with a notched trowel. In ground supported structures, the capillary rise of moisture must be prevented.
With a bonded cast floor we recommend using the maximum amount of water (2.8 L/20 kg) in order to get proper adhesion between the screed layer and the subfloor.
Underfloor heating can be installed directly on a primed (Kiilto Start Primer), coarse, firm concrete or gypsum board surface. Heating pipes/cables are fixed on the subfloor with, e.g., hot-melt adhesive or with suitable installation clips. If using a fibreglass underfloor heating mat, e.g., in renovation, use more flowable Kiilto Lattialämmitystasoite levelling screed for floor heating.
2. Floating construction/weak concrete subfloor:
The cast is separated from the subfloor, for example, with Kiilto Valusuojakangas separation fabric or construction paper. The cast is detached from walls and inlets with separating boards/elastic sealant. The thickness of the cast shall be at least 50 mm reinforced construction (e.g., # 150 Ø 5). In underfloor heating floors, the heating cables/pipes are fixed in the concrete reinforcement.
