weber.san 958

Colours:
white

Water demand:
approx. 5.5 - 6.0 liters / 20 kg

Storage:
The product can be stored for at least 9 months in its original unopened packaging if kept dry.

Fields of application

weber.san 958 is used as a single-layer and quick-setting damp-proof render with high porosity and permeability to water vapour.
Particularly dedicated for small size for ex. on the internal side of damp and salt-contaminated of basement walls below ground level and on external side of above-ground masonries (splash water areas/facade socket areas), damaged by ground damp and salts.
Due to its porous structure it is able to take up damaging salt crystals and hence it can lead to a good drying of the damp masonry. 
weber.san 958 can be applied in one layer up to 40 mm thickness, so that it is best suited on very uneven substrates.
For use indoors and outdoors.

Main features

• application in one layer up to 40 mm
• no necessary bondcoat
• quick-setting; hence can be quickly covered
• highly open to water vapour diffusion
• low capillary water absorption
• high air void content; hence high uptake of crystal salts
• low tension when hardening
• easy application
• low consumption
• mould-inhibiting
• only suitable for manual application

General notes

• All characteristics mentioned in this data sheet are given in this data sheet require a temperature of +23 °C without draughts and a relative humidity rate of 50%.
• The relative air humidity rate should not exceed 60%; the air and substrate temperature should be ≥ +5 °C to ensure a proper setting.
• Proceed to a salt and damp analysis prior to application/remediation.
• For surfaces with high salt-contamination and in line with the WTA guidelines it is recommended to apply a damp-proof underlay render with high air content, like weber.san 952 as basecoat render. The thickness of each layer depends upon the determined salt content; refer to the figures given hereunder in this document ”Recommended application thickness of damp-proof renders in accordance with salt content in % by weight”.
• A complete drying out of the masonry can only be achieved by additional measures, like the installation of a horizontal damp-proof barrier with the silicone micro-emulsion-based injection liquid weber.tec 940 E or the silane-based injection cream weber.tec 946 and/or the installation of a vertical waterproofing on exterior side of basement walls, for ex. the 2-comp. lightweight bitumen waterproofing thick coating weber.tec Superflex 10, etc.
• Protect weber.san 958 from sunlight and draughts to avoid too quick drying.
• Observe the general rendering application rules.

Special notes

• Do not add foreign products during mixing and application.
• The render is not allowed to come in contact with gypsum-containing materials.
• Especially on waterproofing cement-based slurries hairline-cracking cannot be completely excluded, depending on the specific conditions on job site; this cracking does not influence the functionality of the render in a negative way.
• The imbedding of the reinforcement woven mesh weber.sys 987 into the fresh render will prevent hairline cracking.
• For application comply with the national standards and/or guidelines relating to works with damp-proofing of masonries (for ex. WTA leaflets 2-9 “Masonry Repair Damp-Proof Systems” and 4-6 “Subsequent Damp-Proofing of Ground-contacting Structures”). If not issued and if necessary, request technical advice.
• Apply the mineral quick-setting stipple coat weber.san 951 S full-surface as bondcoat on non-absorbent substrates, e.g. mineral waterproofing slurries, which must have completely hardened. The bondcoat must be completely dry before applying the damp-proof render.
• Protect weber.san 954 from sunlight and draughts to avoid too quick drying.