weber.xerm 844

Colour:
blue-grey

Drying time:
max. 4 hours as waterproofing layer;
max. 6 hours as tile adhesive;
full service after 3 days in swimming pools

Storage:
The product can be stored for at least 12 months in its original unopened packaging if kept dry and frost-free. Frost will destroy the liquid component. After thawing it is not allowed to be used.

Fields of application

weber.xerm 844 is a highly-flexible, fast-setting, reactive setting, 2-component system consisting of tile adhesive and waterproofing. After hardening, it is waterproof, frost-resistant, sulphsulphate resistant and ageing-resistant. Suitable as bonded waterproofing under ceramic tiles and slabs in bathrooms and wet-duty rooms according to water loads W0-I up to W3-I, on balconies and terraces and in swimming pools and water tanks. 
In addition, the post-applied coverings can be installed on the previously waterproofed surface with the same material.
As waterproofing material and as tile adhesive in one product, it hardens with low internal stress and minimum cracking.
Due to its weather-independent fast curing and its smooth consistency and easy application, weber.xerm 844 offers the maximum safety against moisture damages for constructions subject to high water loads.
Can also be used as a de-coupling layer on critical substrates, among others on “young” cement screeds between 3rd and 7th day after their application.

Main features

• EMICODE EC 1PLUS: very low emission of volatile substances as bonded waterproofing coating
• class C1 E / S2: C1: pull-off strength ≥ 0.5 N/mm2 in all storage conditions – E: extended open time ≥ 30 minutes – S2: deformation ≥ 5 mm
• tile adhesive and waterproofing compound in one product
• weather-independent drying through reactive setting, even under air exclusion
• fast-setting, even at cooler temperatures
• open to pedestrian traffic and for grouting works after 4 hours
• time- and cost-saving processing
• as 1 mm-thick decoupling membrane on critical substrates
• as moisture protection on top of calcium-sulphate screeds
• prevents efflorescence and frost damages
• low capillarity
• particularly easy and smooth workability
• no necessary aftercare treatment
• for wall and floor coverings with high water load
• particularly convenient for balconies and terraces+
• for shower rooms and flush-floor showers
• fulfills the KSW recommendations for swimming pools (Germany): hence for tile fixing in swimming pools and in all areas permanently underwater
• for use indoors and outdoors

General notes

• All characteristics mentioned in this data sheet are based on a temperature of 23 °C, without draught and a relative humidity rate of 50%.
• Lower temperatures slow down, higher temperatures accelerate the reaction process
• Do not use a material that has already stiffened.
• Comply with the national standards and/or guidelines relating to waterproofing works under tiles and tile fixing works, for ex. “Guidelines for Solid-bonded Waterproofing systems under Tiles” (German Technical Building Rules), EN 14891, “Liquid-applied water-impermeable products for use beneath ceramic tiling bonded with adhesive” and the leaflets of ZDB (Central Association of German Construction Industry); if not issued and if necessary, request technical advice.
• Existing structural joints must be covered and waterproofed with the sealing tape weber.tec 828 DB 75 or DB 150 and taken over in the tile covering in a congruent manner.

Special notes

• Do not use the material on frozen substrates, at freezing temperatures or high temperatures (above 30 °C substrate temperature).
• Protect the fresh waterproofing layer from direct sunlight, frost and rain.
• After 3 days, weber.xerm 844 is permanently waterproof in underwater areas.
• The waterproofing layer is not suitable for direct use; it must be covered with an appropriate protective layer (screed, tiles or natural stones).
• As bonded waterproofing system, it fulfills the standard EMICODE EC 1PLUS (very low emission of volatile substances). For a low-emission tile fixing, use the temperature-independent setting flexible adhesive weber.xerm 859 F or the multi-use flexible tile adhesive weber.xerm 861.