St.One - Stone Repair

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St.One - Stone Repair

Availability: In stock

A blend of Natural Hydraulic Lime, OPC, filler, lightweight filler and additive, which can be dressed with similar tools to the original masonry and remains workable long enough to allow details to be fashioned. (Formerly known as  Lithomex) 

Every effort has been made to ensure the accuracy of the colour and texture of products on this website but due to the limitations of technology, we strongly recommend that sample products are purchased for testing in situ prior to the full order being placed.

St.Astier St.One Standard Colour 020 (2Kg)

£13.50 (Excl. VAT)

St.Astier St.One (Lithomex) Standard Colour 020 (25kg bags)

£59.57 (Excl. VAT)


St One (formerly known as Lithomex) is a specialist stone repair product, made from a blend of Natural Hydraulic Lime, OPC, filler, lightweight filler and additive. 
It has characteristics similar to the host masonry with the adequate bond strength and a good modulus of elasticity. St. One is vapour permeable (comparable to an NHL2) and durable.

It can be dressed with similar tools to the original masonry and remains workable long enough to allow details to be fashioned. It absorbs water sufficiently in wetting and drying periods to match adjacent masonry.

Approximate Coverage: 1.47sqm at 10mm per 25kg bag

St One can be colour-matched to your stone colour*. You will need to supply an actual sample of the stone and clearly mark the face to be matched. Please note colour matching can be time-consuming, it is important that you allow plenty of time and ask for a lead time when we have had an opportunity to look at the actual sample.
Please call us on 01874 611350 for actual samples.

* colours are approximate

Technical Documents
View FileSt.One - Stone Repair (Brick) - Technical Data Sheet    Size: (1.17 MB)
Application Advice

Mixing and use: Can be mixed manually or mechanically by whisk, adding up to 180ml water per kilogram of Lithomex used. Mix well for 3-5 minutes. The application surface must be clean, free from dust and oils.

On porous surfaces, ensure that suction is controlled by pre-wetting and apply Lithomex before this is fully dry.

Never apply to surfaces that are over saturated or have standing water.

It can also be applied on metal laths. For application on dense impervious materials, please consult us.

The minimum thickness is 5mm (can be dressed or cut back to a feather edge). The maximum thickness in 1 pass is 40mm. In cases where a thickness of more than 40mm is required, apply in layers of a maximum of 40mm, each one approximately 24 hours apart.

Always dampen application areas.

The mortar should be well pressed back in place. If required re-compact by pressing after a couple of hours to avoid possible shrinkage marks due to suction from the background.

In some instances support of the fresh mortar is required by using wires, anchorages, stainless steel fixings or formers, etc ...

Simulation of stone / brick features, rough finishes, false joints etc. can be made approximately 5 hours from application (in damp cold weather up to 24 hours).

Shaping and forming of details can be carried out for up to 1 week after placing by scraping to profile or level with metal tools, such as the edge of a trowel or steel float however most shaping and finishing work can be done within 24 hours.

Sculpting, using appropriate tools, requires waiting up to a week or more depending on the weather conditions. Its unique qualities allow it to be tooled, shaped and sculpted even after the final set has taken place. This affords sufficient time to achieve the very highest standard of work with the best quality reproduction.

Where ashlar masonry or very finely jointed masonry has had considerable damage to the arises, flush finishing in Lithomex with a false struck joint is the ideal solution.

If building details are damaged and require repair prior to the facade being lime washed or painted, plain Lithomex should be used as it will readily accept lime washes and paints.

On rendered areas Lithomex can be used to form decorative stone or brick features such as mouldings and cornices. 


Suitable for Stone and Brick