RENO U750 FLEECE | Floor Preparation

RENO U750 FLEECE is a high-performance, flexible, and breathable fiber fleece underlay designed to provide superior decoupling and tension relief for floor installations. Engineered to absorb shear and tensile movements, it ensures long-term stability when installing hard floor coverings or applying leveling compounds over critical subfloors. Whether you are working on a residential renovation or a heavy-duty industrial new build, RENO U750 FLEECE acts as a protective buffer, preventing cracks from reflecting through to the finished surface.

KEY BENEFITS

Relieve tensions caused by shear and tensile movements between the substrate and floor covering.
Stabilizes installation over critical or "moving" subfloors, reducing the risk of surface cracking.
Easy to cut and install, allowing for rapid project progression and minimal waste.
Very low emissions (EC 1 PLUS certified), ensuring a safer environment and superior indoor air quality.

CHARACTERISTICS

Composition: Polyester fleece
Color: White
Packaging: Roll 50 m² (1m x 50m)
Roll weight: 12,5kg (approx. 250 g/m²)
Longitudinal tensile force: Max. 950 (N/50mm)
Transverse tensile force: Max. 700 (N/50mm)
Longitudinale tensile elongation: Max. 35%
Transverse tensile elongation: Max. 37%
Air permeability: 1,100 l/m.s²

Performance & stress management

The fleece absorbs and distributes movement within the substrate, helping to reduce stress transfer to the finished floor. Its tensile strength and elongation properties support decoupling, improving the long-term performance of bonded flooring systems.

Application versatility

Suitable for a wide range of substrates including concrete, screeds, timber, tiles and metal surfaces, RENO U750 FLEECE supports multiple flooring applications. It can be used beneath hardwood flooring, ceramic tiles, natural stone and levelling compounds, and is compatible with underfloor heating systems.

Installation method

Supplied in 50 m² rolls, the fleece is cut to size and bonded onto the substrate using appropriate adhesives. It is embedded into fresh adhesive layers and pressed firmly to ensure full contact. Depending on the system used, flooring installation can typically proceed after approximately 24 hours.

System integration

RENO U750 FLEECE integrates into flooring systems using tile adhesives, MS or PU adhesives, and levelling compounds. For soft floor coverings, a levelling compound layer may be applied over the fleece prior to installation.

Handling & storage

The product is easy to cut and install on site, supporting efficient handling across large areas. It offers a shelf life of up to 24 months when stored in original packaging in cool, dry conditions.

Application process: RENO U750 FLEECE

Quick Application Steps (On-Site Guide)

Prepare: Ensure subfloor is clean, level, dry and correctly primed
Adhesive: Apply suitable adhesive evenly using correct trowel
Install: Lay fleece into wet adhesive and press firmly
Secure: Smooth out and re-roll after ~20 minutes
Finish: Install flooring or levelling layer after ~24 hours

1. Subfloor preparation

Substrate condition is critical for decoupling performance:

Surface must be structurally sound, dry and free from dust, grease and contaminants
Remove weak layers, old adhesives and surface treatments mechanically
Vacuum thoroughly to eliminate loose material
Dense or smooth substrates should be mechanically abraded and cleaned
Uneven surfaces must be levelled using an appropriate primer and smoothing compound
Weak or dusty substrates may require consolidation prior to installation

All substrates must comply with site requirements before application.

2. Installation preparation

Roll out the fleece and cut to size using scissors or a sharp knife
Position material perpendicular to the final floor covering direction where applicable
Fold back sections to allow adhesive application in stages
Select appropriate adhesive depending on flooring type (tile adhesive, MS or PU)
Apply adhesive evenly with the correct notched trowel

Important: Ensure consistent adhesive coverage to achieve full bonding.

3. Installation

Lay the fleece into the fresh adhesive bed without creasing
Press firmly across the entire surface, paying attention to seams and edges
Use a roller or trowel to ensure full contact with the substrate
Rework the surface after approximately 20 minutes to secure adhesion
Install in sections, repeating the process across the full area
Ensure joints are tight with no gaps or overlaps

Designed to absorb movement stresses and stabilise challenging substrates beneath floor finishes.

4. Drying & curing

Allow adhesive to cure before proceeding (~24 hours depending on system)

Typical next steps:

Tiles: install directly after curing
Wood flooring: bond once fleece is secure
Soft flooring: apply up to 5 mm levelling compound before installation

5. Underfloor heating

Switch off heating systems 48 hours before, during, and for at least 48 hours after installation
Gradually bring heating back to operating temperature after curing

Common mistakes to avoid

Installing onto uneven or inadequately prepared substrates
Poor adhesive coverage leading to incomplete bonding
Creating creases or trapped air beneath the fleece
Not re-rolling after initial placement
Leaving gaps between fleece sections
Exceeding adhesive open time before laying material
Applying outside recommended temperature range (+15°C to +30°C)