DOBAU® Dachelastik 5 kg – Roof waterproofing compound for bitumen membranes, timber, metal & mineral substrates
DOBAU® Dachelastik is a paste-like, thixotropic roof waterproofing compound based on solvent-based polymer-bitumen for creating seamless coatings (new waterproofing and refurbishment). Ideal for roofs with bitumen roofing membranes as well as for timber, metal and mineral substrates.
Key Benefits at a Glance
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Thixotropic – non-sag, easy and economical to apply
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Elastic & crack-bridging
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High heat resistance
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High flexibility even at low temperatures
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High ageing & UV resistance
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Very good adhesion to bitumen-based & mineral substrates
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Resistant to aqueous solutions, diluted acids, salts, lime, cement and more
Typical Applications
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New waterproofing and refurbishment of flat roofs
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Seamless coating on bitumen roofing membranes
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Coating on metal and mineral substrates
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Details/joints – with reinforcement fabric in crack-prone areas
Application
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Prepare the substrate: clean, dry, free from oil and grease, firm and load-bearing. Remove loose parts and repair defects. Cut out blisters/waves in roofing membranes and overlap/patch properly.
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Primer: A bitumen primer is generally not required.
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Weather conditions: component and ambient temperature > +5 °C. Protect from water/rain/frost during application and drying.
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Application: stir thoroughly, distribute and apply with a roof brush or rubber squeegee in an even layer thickness in at least 2 passes (brush strokes in parallel direction).
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Drying: apply the 2nd coat only after the 1st coat has dried (weather-dependent, usually after approx. 1 day).
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Joints / crack-prone areas: embed reinforcement fabric (e.g. glass silk fabric). Procedure: pre-coat thinly, place fabric, press in and fix by overcoating once again.
Important note: This product contains aromatic solvents and may attack rigid polystyrene foam. When refurbishing insulated roofs, use only solvent-resistant insulation materials (e.g. PU, mineral wool).
Consumption (Guideline Values)
| Application |
Execution |
Consumption |
| Flat roof (roof pitch > 3°) |
min. 2-coat system |
approx. 1.5 kg/m² per coat |
| Surface protection (optional) |
Broadcast with slate chippings 1/3 mm |
approx. 1.0 kg/m² Dachelastik + 4–6 kg/m² slate chippings |
| Protective layer during roof works (roof pitch ≥ 1.5° to < 3°) |
min. 2-coat system with reinforcement fabric |
approx. 1.5 kg/m² per coat |
Technical Highlights
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Binder: polymer-bitumen
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Solvent: hydrocarbons
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Colour: black
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Layer thickness: 1 kg/m² wet application ≈ 0.5 mm dry film
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Heat resistance: at +100 °C (2 hrs, 1 mm) no running
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Cold resistance: at -15 °C (1 mm) no flaking
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Storage: frost-free, in original sealed container min. 12 months
