About erstoplast
Water-Impermeable Renovation Plaster for Moisture-Exposed Masonry
erstoplast is a water-impermeable, cement-based renovation plaster for the remediation of damp or water-saturated masonry surfaces, including areas exposed to water under pressure. It is suitable for interior and exterior use and is resistant to positive and negative water pressure (up to approx. 1 bar, according to the test report).
Due to its special structure:
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It supports the drying of moisture-affected masonry
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allows water vapour to diffuse
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prevents water ingress
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creates a durable substrate suitable for further compatible coatings.
Operating principle
How does erstoplast work?
1. Waterproof matrix
The cementitious binder composite forms a water-impermeable structure which: blocks water under pressure, limits capillary moisture penetration and supports the drying of moisture-affected mineral substrates.
2. Diffusion openness
Despite its water-impermeable structure, the plaster remains vapour-permeable:
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Water vapour can escape
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The vapour-permeable structure supports the drying of moisture-affected masonry.
3. Adhesive and compressive strength
Thanks to its mineral structure, erstoplast offers:
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high tensile adhesion strength
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crack resistance
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compressive strength
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suitability for highly exposed areas
Features and benefits
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Water-impermeable when professionally applied
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Resistant to positive and negative water pressure (up to approx. 1 bar)
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Supports the drying of moisture-affected masonry
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Water-vapour permeable
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Suitable for use on damp and wet surfaces
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High tensile adhesion strength & crack resistance
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Environmentally friendly, cement-based, VOC-free
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Suitable for contact with drinking water (according to certification)
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Can be overcoated with suitable, system-compatible coatings
Downloads
Product brochure
Technical Data Sheet erstoplast
Areas of application
Buildings & Structures
Basement walls
Earth-contacting components
Base areas
Renovation projects
Water engineering zones
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Basins, tanks, silos
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Technical rooms
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Pump shafts
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Rainwater retention areas
Typical problem areas
Damp walls
Salt-contaminated base areas
Areas affected by driving rain or pressurized water
Key technical data
Parameters
binder
Variants
Waterproofing
diffusion
Value
Cement-bound special mixture
coarse (10–20 mm), fine (3–5 mm)
up to approx. 1 bar (positive/negative)
highly vapour-permeable
Parameters
Subsurface moisture
Application
VOC
Drinking water approval
Value
suitable for damp or wet substrates
Indoor & Outdoor
no
Yes (according to certification)
FAQ
Frequently Asked Questions About erstoplast
Can erstoplast be applied to wet walls?
Yes, the plaster is specially designed for damp and wet surfaces.
How quickly can the substrate dry?
The drying process depends on the degree of moisture exposure, substrate condition, component structure and ambient conditions. erstoplast supports drying through its vapour-permeable system structure.
Is erstoplast a classic renovation plaster?
erstoplast combines a water-impermeable structure with vapour permeability and resistance to positive and negative water pressure of up to approximately 1 bar, according to the relevant test report.
Can erstoplast be overcoated?
Yes. erstoplast can be overcoated with suitable, system-compatible coating systems, subject to the relevant product and substrate requirements.
Is a horizontal barrier still necessary?
In cases of rising damp, an additional horizontal barrier may be advisable – depending on the extent of the damage.
