Article No. 040420
WTA-compliant restoration render for masonry exposed to moisture and salt
Product specifications
On delivery
Aggregate as per DIN EN 13139
Two layers up to 40 mm
The stated values represent typical product characteristics and are not to be construed as binding product specifications.
Field of application
- Rapid repair of wall surfaces contaminated by moisture and harmful salts (internal wall surfaces in basements and old buildings)
- Facades, historic buildings and architectural monuments
- Can be used in combination with SP Levell in areas exposed to high levels of harmful salts
- Can be applied in a single layer as an undercoat or finishing coat
Properties
- Fast curing
- High sulphate resistance and low active alkali content (SR/NA)
- High salt storing capacity
- Enables water vapour diffusion
- Pore hydrophobic
- Fibre-reinforced
- Promotes drying
- Single-layer application thickness up to 30 mm
-
Preparation
-
Substrate requirements
Clean, dust-free and capable of supporting a load.
-
Preparations
Remove render, paint layers and coatings at least 80 cm above the damaged area.
Chase out friable joints to a depth of at least 2 cm.
Pre-wet absorbent substrates so that they are slightly damp.
Substrate: absorbent with low strength
Apply SP Prep rapid as adhesive bridge (coverage area 50-70% opaque) at a layer thickness of max 5mm.
Alternative: apply SP Top rapid as a scratch coat (contact layer).
Substrate: weakly absorbent
Apply SP Prep or SP Prep rapid at full coverage (100%) with max. 5 mm layer thickness.
Alternative: apply SP Top rapid as a scratch coat (contact layer).
Substrate: fast-setting mineral waterproofing slurry
Apply SP Prep rapid as a fully covering adhesive bridge in the last layer of slurry fresh on fresh.
-
-
Application
-
One-layer
Apply the product using a suitable tool.
Two-layer
Roughen the first layer with a render comb.
Apply second layer once sufficiently dry.
Alternatively, apply the total layer thickness in two layers wet-on-wet, with embedded reinforcement fabric (Tex 6.5/100). Allow fabric strips to overlap by min. 10 cm.
Level off surface with a long float.
Finish the surface once set.
Prepare the surface for subsequent layers with a grated scraper after sufficient setting.
Pre-wet hydrophobic surfaces with detensioned water so that they are slightly damp before applying further render coats.
-
Application instructions
-
Once it has hardened, mortar must not be made workable again by adding either water or more wet mortar.
On critical substrates (highly uneven, fissured, mixed masonry) we recommend incorporating the reinforcement fabric in the upper third of the restoration render.
Apply additional diagonal reinforcement to the edges of building openings.
Protect wet mortar surfaces against frost, rain and drying out too quickly for at least 4 days.
Hairline/shrinkage cracks are safe and are not cause for complaint as they do not impair the properties of the mortar.
To ensure that the renovation is successful, the relevant drying conditions according to WTA Code of Practice 2-9-20/D must be met.
-
-
Working tools / cleaning
-
Mixing tool, trowel, smoothing trowel, smoothing float, aluminium float, render comb, grated scraper, sponge float
-
Clean tools with water while the material is still fresh.
-
Storage / shelf life
-
If stored in an unopened container and in a dry place, the product will keep for approx. 12 months.
-
Usage
-
Approx. 8.5 kg/m²/cm layer thickness, at 2 cm render thickness approx. 17 kg/m²
-
Apply to a large enough trial area to determine the precise amount required.
-
General information
-
May contain traces of pyrite (iron sulphide).
Do not use on gypsum-based substrates.
The mixing water must be of drinking water quality.
Low chromate content in accordance with Directive 2003/53/EC.
Always set up a trial area/trial areas first.
The characteristic data of the product were calculated under laboratory conditions at 20°C and 65% relative humidity.
Current regulations and legal requirements must be taken into account and deviations from these must be agreed separately.
The relevant test certificates must be observed when planning and carrying out work.
-
-
Disposal instructions
-
Larger quantities of leftover product should be disposed of in the original containers in accordance with the applicable regulations. Completely empty, clean containers should be recycled. Do not dispose of together with household waste. Do not allow to enter the sewage system. Do not empty into drains.
-
-
Safety / regulations
-
For further information on the safety aspects of transporting, storing and handling the product and on disposal and environmental matters, please see the current Safety Data Sheet.
-