Flat-roof coating —
seamless & rain-resistant in 24 h
roofing Flat-roof waterproofing

Flat-roof coating —
seamless & rain-resistant in 24 h

Liquid-plastic system against standing water, frost and UV. Directly on bitumen, concrete or EPDM. Without welding, without seams, without open flame — a continuous elastic membrane for long-term protection.

01 / The problem

What happens when a flat roof leaks

Ein Flachdach versagt selten plötzlich. Es versagt schleichend — und der Schaden zeigt sich erst, wenn die Bausubstanz schon getroffen ist.

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Wasserflecken an der Decke

Die undichte Stelle macht sich erst Monate später bemerkbar — wenn die Dämmung bereits durchnässt ist und Putz, Tapeten oder Holz beschädigt sind.

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Schimmel & Energieverlust

Durchfeuchtete Dämmung leitet Wärme bis zu 4× stärker als trockene. Heizkosten steigen um 15–25 %, Schimmel im Dachaufbau wird zur Frage der Zeit.

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Bitumen altert weiter

UV und Temperaturwechsel lassen alte Schweißbahnen jährlich um 0,2–0,5 mm reißen. Nähte sind das schwächste Glied — die neue Schicht muss nahtlos sein.

02 / Why RubberPaint

Why liquid rubber for flat roofs

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−20 °C bis +50 °C flexibel

Übersteht hunderte Frost-Tau-Zyklen ohne Rissbildung. Hochelastisch (Klasse A0/C0) — folgt jeder Bewegung der Konstruktion.

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Completely seamless

Eine durchgehende Membran bis 200 m² ohne eine einzige Naht. Die häufigste Schadensquelle klassischer Dächer entfällt komplett.

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UV-stable, no embrittlement

Stabilisiertes Acryl-Latex-System. Keine Versprödung wie bei klassischem Bitumen — auch nach 15 Jahren prallem Sonnenschein elastisch.

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Walk-on after 24 h

Wartungswege, Klimaanlagen und Antennen sofort wieder erreichbar. Kein Bauausfall, kein Schweißbrenner, keine Brandgefahr.

03 / Application

Step-by-step guide

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Prepare the substrate

The foundation of long life.

Clean the roof surface with pressure washer or wire brush — fully remove loose bitumen residue, moss, algae and dirt. Pre-fill cracks > 3 mm with bituminous repair compound, mechanically loosen any peeling areas. Substrate must be dust-free and dry for at least 4 h before application.

On heavily weathered bituminous sheets: apply a bitumen primer to stabilise.

Pro tip: Check the roof slope beforehand — if puddles form, we recommend a slope renovation with levelling compound first.

Prepare the substrate
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Reinforce connections with fleece

The critical 5 % of the area.

Chimneys, skylights, roof drains and upstands are the weakest points — 80 % of all leaks start here. Embed polyester fleece (60 g/m²) into the wet first coat, roll flush. Minimum 10 cm overlap at wall/upstand edges, cut circular around drains and work U-shaped into the upstand.

At wall connections: pull the fleece at least 15 cm up the wall for a reliable bond.

Pro tip: At chimney connections add a termination bar with sealant — fleece alone isn't enough against thermal movement.

Reinforce connections with fleece
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First coat — base barrier

Full-surface application.

Dilute with 0–5 % water. Apply with brush, lambswool roller or airless sprayer (15–18 MPa, nozzle 0.017–0.023″). Consumption 100–200 g/m². Work evenly in one direction, no gaps or thin spots. On weathered bitumen or porous concrete: deep primer 12 h beforehand recommended.

Particularly careful on fleece-reinforced areas — the coat must fully penetrate the fleece.

Pro tip: With an airless sprayer work against the wind — otherwise half the material lands on the neighbour's wall.

First coat — base barrier
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Drying and curing

Patience pays off.

Dust-dry after 2 h, recoatable after 4 h, rain-resistant after 24 h at 23 °C / 50 % RH (manufacturer specification). Wait longer at lower temperatures — applying the second coat too early causes bubbles as residual moisture gets trapped.

Protect the roof from rain and frost during drying — at least 24 h without precipitation required.

Pro tip: Check the weather forecast 48 h ahead — flat-roof coating is not rain-tolerant and needs a stable weather window.

Drying and curing
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Second coat — armour

The final layer.

Apply undiluted, cross to the first coat. Consumption again 100–200 g/m². Rain-resistant after 24 h, carefully walkable after 24 h (soft shoes, no point loads), fully load-bearing and cured after 28 days.

On heavily-loaded maintenance paths or frequently walked areas we recommend a third coat for longer service life.

Pro tip: Mark maintenance paths with a contrast-coloured quartz-sand strip — extends service life through targeted wear protection and prevents point loads elsewhere.

Second coat — armour
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Pro tip

On heavily weathered bituminous sheeting apply a deep primer first. At frequently walked maintenance paths or chimney connections we recommend a third coat. Fleece reinforcement at connections is a processing recommendation from rubber-paint.de and not part of the manufacturer specification.

04 / Specifications

Technical data

Consumption per coat 100–200 g/m² (0.1–0.2 kg/m²)
Recommended coats 2 (3 for heavily-stressed surfaces)
Drying time 2 h dust-dry · 4 h recoatable
Rain resistance after 24 h (manufacturer specification)
Full cure 28 days
Application temperature +10 °C to +30 °C
Service temperature −20 °C to +50 °C
Elasticity highly elastic (Class A0/C0 to EN 1062-1)
Use case Protective coating — not a primary waterproofing system
Binder Acrylic latex (solvent-free)
Tool cleaning Water, immediately after application
05 / Material calculator

How much do I need?

Geben Sie Ihre Dachfläche und gewünschte Anzahl Schichten ein — wir empfehlen die optimale Kombination an Eimern. Für Flachdächer ist Schwarz Standard.

Standard: 2 coats. 3 for heavily-stressed surfaces.

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Verbrauch: 150 g/m² pro Schicht. +10 % Reserve für Schnittkanten und unebene Flächen. Bei Großprojekten (> 80 m²) kontaktieren Sie uns für eine individuelle Beratung.

Empfehlung

6,6 kg benötigt

für 20 m² · 2 Schichten

Wird berechnet…

Gesamtmenge
Gesamtpreis

Versandkostenfrei ab 199 € — schauen Sie sich Ihren Warenkorb nach dem Hinzufügen an.

08 / FAQ

FAQ — flat-roof coating

Kann ich RubberPaint auf altem Bitumendach auftragen?
Yes, after thorough cleaning (pressure washer, remove loose particles) and a bitumen primer as bonding base. Pre-fill cracks > 3 mm with repair compound. Stabilise heavily weathered bituminous sheets with deep primer.
Welches Gefälle ist nötig?
At least 1.5 % slope for water run-off. Puddles form on horizontal surfaces — the coating tolerates standing water but the look suffers over time. With standing puddles we recommend spot-renovation of the slope first.
Was, wenn es während der Trocknung regnet?
The first coat needs 6 h rain-resistant drying at 23 °C / 50 % RH. Longer at lower temperatures. Cover with a tarpaulin before rain or reschedule work to a 24 h dry period — precipitation in the first hours softens the layer.
Ist die Beschichtung wurzelfest für Gründächer?
For extensive green-roof planting (Sedum, mosses) please speak with our support beforehand for material and build-up advice. For intensive planting with large plants we recommend an additional root-protection layer as primary protection.
Wie lange hält die Beschichtung?
With correct application the system provides long-term protection. UV stability and freeze-thaw resistance have been confirmed in extensive testing. Maintenance: visual inspection every 5–7 years, refresh coat if micro-cracks appear.

Haben Sie eine technische Frage zu Ihrem Flachdach?

Unser Team berät Sie zu Untergrund-Analyse, Schichtdicken und Materialbedarf — kostenlos und unverbindlich.