weber.san 953

Colours:
natural grey

Water demand:
approx. 7.5 liters / 25 kg

Storage:
The product can be stored for at least 12 months in its original unopened packaging if kept dry.

Anwendungsgebiet

weber.san 953 is used as a very porous and vapour-permeable masonry repair damp-proof render.
Especially used on the internal side of damp and salt-contaminated of basement walls below ground level and on the 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.
For use indoors and outdoors.

Main features

• highly open to water vapour diffusion
• resistant to salts
• low capillary water absorption
• high air void content; hence high uptake of crystal salts
• low ratio compressive strength / flexural tensile strength
• low consumption
• easy application
• for mechanical and 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 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 a 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 vertical waterproofing on the exterior side of basement walls, for ex. the 2-comp. lightweight bitumen waterproofing thick coating weber.tec Superflex 10, etc.
• Protect weber.san 953 from sunlight and draughts to avoid too quick drying.

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 the job site; this cracking does not influence the functionality of damp-proof 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.