Kerakoll Floorzero is a grayish-green structural base layer applied with a trowel on floors. It flexibly coats the existing substrate — ceramic, concrete, marble — fills joints and gaps, and cushions impacts. The Cementoresina texture layers are built on this. It can also be applied for waterproofing. This is the "zero layer" of the Cementoresina system — the durable, flexible structural base.

• Flexible structural base: fills joints, follows substrate movement, cushions impacts — therefore Cementoresina layers do not crack further
• For existing floors: tile, gres, marble, concrete — without demolition, with Keragrip Eco Pulep preparation
• Part of the system: structural base of the 6-layer Cementoresina system — sold separately as it depends on the substrate
• Fills gaps backward: joints, cracks, hairline cracks — does not shrink (UNI EN 12617-1), so they do not reopen
• Flexibly absorbs impacts: ≥ 6.6% elasticity (ISO 527-2) — upper layers do not break because the base cushions
• Also for waterproofing: can be applied directly over Aquastop Extreme systems
• Compatible with underfloor heating: suitable according to EN 1903
• Required with Cementoresina layers: not a finished surface on its own

What is it suitable for?

Substrates:

• Cement-based screed, self-leveling floor leveling compound — with EP21 primer
• Anhydrite screed — with a 30% mixture of EP21 + Keragrip Eco Pulep
• Synthetic screed — with a mixture of EP21 + Quarzo 5.12
• Existing marble, ceramic, gres tiles — with Keragrip Eco Pulep adhesion promoter
• Waterproofing — directly over Aquastop Extreme systems

Spaces (floor only, structural layer):

• Living spaces: living room, bedroom, hallway
• Wet areas: bathroom, kitchen, stairs, shower tray
• Commercial spaces: shop, restaurant, café

Not suitable for:

• Outdoor use, substrates exposed to moisture
• Improperly prepared underfloor heating
• Too wet substrates: cement-based >2% (>1.7% with underfloor heating), anhydrite >0.5% (>0.2% with underfloor heating)
• Parquet, PVC, laminated parquet, linoleum
• Carrier layers containing hygroscopic materials (clay)
• As a standalone surface (without Cementoresina layers)

Frequently Asked Questions

What is it for?
The structural base layer of the Cementoresina floor system. It flexibly coats the existing substrate, fills joints, cushions impacts. The colored Cementoresina layers are built on this.

Can it be applied on tiles?
Yes, with Keragrip Eco Pulep adhesion promoter. It fills joints and provides an even base for the Cementoresina layers.

Is it compatible with underfloor heating?
Yes, suitable according to EN 1903. Substrate moisture: cement-based max 1.7 CM%, anhydrite max 0.2 CM%.

Is it sold separately?
Yes, always purchased separately. Cementoresina packages DO NOT include it. You need to buy separately: Floorzero + Net 90 mesh + Quarzo 1.3 + primer.

How long does it take to dry?
Walkable after 6 hours (+20 °C) or 18 hours (+10 °C). Next layer can be applied after 48 hours.

Why is the Net 90 mesh necessary?
Structural reinforcement. Without the mesh, cracks spread further and certification is invalid. It is mandatory.

What is Quarzo 1.3 for?
Mechanical grip. Quartz grains embed — Cementoresina layers adhere to this. Without it, layer adhesion is poor.

Can it be applied over Aquastop waterproofing?
Yes. Sand with 120 grit paper, moisten with Keragrip Eco Pulep cloth, wait 10 minutes. Apply Floorzero.

Can I apply it myself?
Yes, but expertise is required. Embedding Net 90, sealing joints, even thickness, Quarzo scattering — all critical. Without experience, leave it to a professional.