Interior skim coat
Knauf Multifinish, Placo Lutèce — spatula application on plaster or BA13. Fast drying, very smooth finish.
Renovation — RenderingInterior &
Interior &
exterior rendering
Skim coats, facade renders, floor levelling — Knauf, Weber, Parex, Sika. Perfect preparation determines the quality of the final result. QUASART in Luxembourg and the Greater Region.
Knauf · Weber · Parex · SikaSkim coat · Facade · LevellingInterior & exteriorPerfect substrates
80%Preparation = result
±2 mmFlatness tolerance
3-30 mmLevelling thickness
Surface preparation
Rendering: the invisible step that guarantees the visible result.
Rendering is the preparation of surfaces before applying final finishes — paint, tiles, parquet, wallpaper. A poorly prepared surface — uneven, porous, cracked — irreversibly compromises the quality and durability of the finish.
QUASART, based in Crauthem (L-3327), provides interior rendering (skim coating, correction), exterior rendering (facade renders, waterproofing) and floor levelling (self-levelling, fibre-reinforced). Each substrate and end use has its product and technique.
Rendering · Trade sheet
Données certifiéesImpact on final result10.0
Versatility9.5
Precision9.0
Speed8.0
Tolerance achieved±2 mm under 2 m rule
Treated surfacesPlaster, concrete, BA13, floors
Interior skim coatKnauf Multifinish, Placo Lutèce — 1 to 3 mm, paint-ready
FillingKnauf Uniflott, Sika MonoTop — cracks, holes, impacts
Facade renderWeber Monorex, Parex Monorex — single or double coat, 15-25 mm
WaterproofingParex Revlane, Weber.rep — elasticity ≥ 1.5 mm, anti-crack
Floor levellingWeber Nivelit, Knauf Nivelite — self-levelling, 3 to 30 mm
RoughingSpatterdash + body coat — correction of major raw concrete defects
DTU 26.1DTU 59.1DTU 52.10EN 998-1EN 13813CSTB Avis Technique
Products
Four render families for four uses
Each surface type and final finish requires a specific render.
01 / PRODUCTS
Skim coat
Knauf Multifinish, Placo Lutèce — interiorFineness10.0
Versatility8.0
Cost8.0
Spatula or trowel application — 1 to 3 mm. Fast drying. Very smooth finish, minimal sanding. The standard for all interior finishes.
Finish02 / PRODUCTS
Quick filler
Knauf Uniflott, Sika MonoTop — repairFineness7.0
Versatility9.5
Cost9.0
Filler for cracks, anchor holes, impacts, chasings. Fast setting (15-45 min).
Repair03 / PRODUCTS
Facade render
Weber Monorex, Parex — exteriorFineness7.5
Versatility7.0
Cost6.5
Single or double coat facade render — 15 to 25 mm. Float, scraped, stone-effect. Custom colours.
Facade04 / PRODUCTS
Self-levelling compound
Weber Nivelit, Knauf Nivelite — floorsFineness8.5
Versatility7.5
Cost7.0
Self-levelling compound for uneven floors — 3 to 30 mm. Fluid pour, self-levelling. Substrate for tiles, parquet, PVC, resin.
FloorsResults & finishes
From perfect smooth to industrial levelling.
Rendering prepares the surface for the desired final finish.
Paint-ready
Paint-ready smoothPerfect surface — matte or satin
Wallpaper-ready
Wallpaper-ready smooth±2 mm flatness — bonding substrate
Tile
Tile levellingSelf-levelling — sealed laying substrate
Parquet
Parquet levellingSelf-levelling ≥ 12 MPa — ±2 mm flatness
Floated
Floated facadeFine grain — contemporary look
Waterproofed
Waterproofed facadeFlexible coating — anti-crack
Referenced manufacturers
Four manufacturers. Rendering mastered.
QUASART works with reference manufacturers for each render type.
Germany · InteriorGermany · Interior · Multifinish
KNAUF
Multifinish · Uniflott · NiveliteComplete interior render range. Multifinish (skim coat), Uniflott (jointing), Nivelite (floor levelling).
Multifinish — interior skim coat, 4h drying
Uniflott — high-strength jointing
Nivelite — self-levelling floor compound
Betokontakt — concrete bonding primer
France · VersatileFrance · Saint-Gobain · Wide range
WEBER (Saint-Gobain)
Nivelit · Monorex · Calcisoil · RepThe widest range — interior, exterior, floors.
Nivelit — self-levelling P3 to P4
Monorex GT — single-coat facade render
Calcisoil — self-levelling thin screed
Rep — structural repair mortar
France · FacadesFrance · Facades · Anti-algae
PAREX (Sika)
Revlane · Parexal · LankofugeFacade coating specialist.
Revlane — flexible waterproofing ≥ 1.5 mm
Parexal — lightweight single-coat render
Lankofuge — colourless facade water repellent
Integrated anti-algae biocide
Switzerland · Repair & specialSwitzerland · Repair · Technical
SIKA
MonoTop · Sikafill · SikaFloorStructural repair and technical coatings range.
MonoTop — structural concrete repair
Sikafill — roof/terrace waterproofing
SikaFloor — epoxy/polyurethane floor resin
High-performance technical solutions
Types of rendering
Skim coating, facade, levelling — comprehensive expertise.
Filling & correction
Knauf Uniflott, Sika MonoTop — cracks, holes, impacts, chasings. Essential preliminary steps.
Facade render
Single or double coat depending on substrate condition. Cleaning, crack bridging, priming, application.
Facade waterproofing
Parex Revlane, Weber.rep — flexible coating elasticity ≥ 1.5 mm. Bridges micro-cracks.
Floor levelling
Weber Nivelit, Knauf Nivelite — self-levelling 3-30 mm. Substrate for tiles, parquet, PVC, resin.
Concrete roughing
Spatterdash or roughing on raw concrete before finishing. Corrects major defects.
Implementation
Rendering steps
Each rendering type follows a protocol adapted to the substrate and final finish.
01
Substrate diagnosis
Adhesion test, moisture measurement, defect survey. Selection of appropriate product.
Adhesion · Moisture · Defects02
Preparation & priming
Cleaning, dust removal, sealer. Bonding primer on smooth concrete. Bridging of active cracks.
Sealer · Primer · Bridging03
Render application
Skim coat: spatula or trowel, 1-3 mm. Levelling: self-levelling pour. Facade: machine spray, 15-25 mm.
Spatula · Pouring · Machine04
Sanding & inspection
Dry sanding (interior). Flatness check ±2 mm. Dust removal before finish.
±2 mm · Sanding · InspectionTechnical standards
Standards & certifications
Every QUASART rendering job complies with applicable standards and DTU.
DTU 26.1
Rendering works
DTU for interior and exterior mineral renders.
DTU 59.1
Painting works
DTU defining surface preparation levels before painting.
DTU 52.10
Sealed floor coverings
DTU for sealed floor coverings — levelling must guarantee required flatness.
EN 998-1
Rendering mortars
European standard for rendering mortars — classification, performance.
EN 13813
Screeds & levelling
European standard for screed materials — compressive and flexural strength.
CSTB AT
Technical Approval
Products used hold CSTB Technical Approvals.
Areas of application
Rendering — for which projects?
01
Preparation before painting
The core of rendering — skim coat on walls and ceilings before painting. Perfect surface = perfect paint.
02
Levelling before floor covering
Flatness correction of concrete substrate before tiles, parquet or PVC installation.
03
Facade refurbishment
Facade render on degraded substrates — filling, waterproofing, painting.
04
Concrete repair
Structural repair mortar (Sika MonoTop) for concrete spalling, exposed reinforcement.
Selected projects
Rendering in action
Knauf Multifinish — 120 units
Skim coat · 2024Gasperich ResidenceGasperich, Luxembourg
Weber Nivelit self-levelling 15 mm
Levelling · 2024Bertrange VillaBertrange, Luxembourg
Parex Revlane waterproofing
Refurbishment · 2023Strassen FacadeStrassen, Luxembourg
Weber Nivelit P4 under parquet
Levelling · 2023Kirchberg OfficeKirchberg, Luxembourg
Sika MonoTop + finishing render
Concrete repair · 2024Esch BuildingEsch-sur-Alzette, Luxembourg
Knauf Multifinish + Tollens paint
Skim coat · 2023Thionville HouseThionville, France
Rendering is the work nobody sees — but everyone sees when it’s done badly. 80% of the final result is determined beneath the coat of paint.QUASART — Execution philosophy
FAQ
Questions about rendering
Everything you need to know
On new BA13: 1 skim coat + sanding + primer. On raw concrete: spatterdash + body coat + finish (3 coats). On old walls: local correction + 2 skim coats.
Yes, and it’s often necessary. Floating parquet requires ±2 mm flatness under a 2 m straightedge. Self-levelling compound with ≥ 12 MPa compressive strength.
Standard levelling compounds go from 3 to 30 mm. Fibre-reinforced (Weber Nivelit Pro Fibré) can reach 50 mm in one pour. Beyond that, a screed is needed.
Rigid render does not seal active cracks. For micro-cracks (< 0.3 mm), a flexible coating (Parex Revlane, elasticity ≥ 1.5 mm) is the solution.
On smooth (shuttered) concrete: yes, mandatory (Knauf Betokontakt, Weber.prim). On rough porous concrete: a sealer is sufficient.
Levelling compounds dry in 24h for foot traffic and 3 to 7 days for finish installation. A 10 mm levelling dries in 2-3 days.
Areas of operation