Ralastigum FR

Brand: RA&Sons

Multi-purpose fibre-reinforced liquid waterproofing membrane, formulated with bitumen in water emulsion, selected elastomeric resins and special additives. It has excellent elasticity, waterproofs and protects from atmospheric agents and from UV rays. It is cold laying, directly on old bituminous membranes without having to dismantle them. It is age resistant, odourless and non-flammable, non toxic and solvent free.

Surface Preparation

Make sure the surface is free from detached parts, loose debris or non-adherent parts, coatings, rust, powder, disarming oils and carefully clean the surfaces so they become sound and dry. Before application fastness and efficiency of water run off points must be carefully checked.

This product can be applied to a slightly damp surface, provided there is no stagnant water.



RALASTIGUM FR can be applied by roller, brush or broom.  The product is applied in two coats (do not dilute). Apply the second coat when the first one is completely dry, after 24-48 hours depending on the environmental conditions and the porosity of the substrate.

After use, clean the tools with water. If product had dried on them, remove with warm water or white spirit.




  • At temperatures below+5°C or above +35°C
  • On freshly laid bituminous surfaces
  • Do not exceed average consumption for each coat
  • On surfaces subject to rising or strong water pressure#

The average consumption depends on the treated surface and on the layer desired thickness. To obtain a dry film of 1mm, the quantity to be used is approximately 1,5 Kg/m²

Fibrated Bituminous Liquid Membrane

Packaging & Storage

Safety Notice

It is recommended before using RALASTIGUM FR to consult the product safety data sheet available upon request

Technical Data

Thixotropic paste
Black when dried
Shelf life in original container
12 months
Solid content (m/m at 130°C)
EN ISO 3251 (65÷73)%
Viscosity Brookfield (at 20°C, Impeller n.6;-10 rpm)
EN ISO 3219 (30.000±6.000)cP
Density (at 20°C)
EN ISO 2811-1 (1,25±0,05)Kg/L
pH (at 20°C)
External drying time
4 hours
Drying time for finishing covering
24÷48 hours depending on thickness and specific site conditions
Permeability to CO²
EN 1062-6 S(D) > 50m
Water vapour permeability
EN ISO 7783 Class I (S(D) <5m)
Liquid water permeability
EN 1062-3 w<0,1 Kg/m².h(0,5)
Tensile bond strength (by pull off)
EN 1542 ≥1N/mm²
The data and statements in this information sheet refer to laboratory tests in our possession, conducted in standard environmental conditions. Practical applications on site according to these conditions of use may result in different data readings. Due to the wide variety of possible uses and applications, the end-users should independently determine the suitability of the material for their specific purpose prior to use. R.A. & SONS Manufacturing Ltd. reserves the right to make technical modifications of any kind without prior notice.

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