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Wintermix Mortar and Render - Natural Hydraulic Lime Mortar

Name: Wintermix Mortar and Render - Natural Hydraulic Lime Mortar
Brand: Cornerstone
SKU: GvucrrETYEvFqk3ik73b2

Verified by manufacturer 1 month ago

Cornerstone

A multipurpose hydraulic lime mortar for general building, pointing and rendering in colder weather conditions with a medium texture and refined buff coloured finish.

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Application

Suitable for external use, where the binder strength is appropriate for the host background or surface.

Due to the inital rapid strength development of Wintermix, the NHL2 versions should be treated as an NHL3.5 mortar and the NHL3.5 should be treated as an NHL5 for specification purposes. Appropriate for various project types, including conservation, renovation, or restoration. Relevant for building, pointing and coarse render coat applications in cold environmental conditions when paired with best practice curing and aftercare.

A 25kg bag yields approximately 14.5 litres of mortar and covers roughly 1.5m² at a 10mm thickness for pointing applications. On-site trials are advised for the best yield indication for your specific project.

As natural products, our kiln-dried sands may exhibit variations in colour, texture, and shape. While these variations are minimal, when colour consistency is crucial, we strongly advise each elevation is completed using material from the same batch.

Supplied in 25kg polythene-lined and colour and batch-code paper bags for easy identification on-site and palletised for ease of transport, storage, and handling. FIBC tonne bags are also available.

Description

Cornerstone Wintermix is a dry ready mixed multipurpose natural hydraulic lime mortar, render and plaster formulated explicitly for work in challenging cold environmental conditions. Available in the colour off-white.

Engineered with precision, using 100% pure natural hydraulic lime, natural sands, and additives to create a high-performance winter work multipurpose mortar, render and plaster. With improved workability, an accelerated set, and an enhanced cure, this mortar is designed explicitly to combat frost damage and limit the impact of frost crystals. Once the initial strength is achieved, strength development slows in line with a standard NHL mortar. Free of synthetic polymers and Portland Cement. Available as standard with Otterbein NHL2 or Saint-Astier® NHL3.5. Other binders and mix ratios are available upon request.

Well-suited for winter work applications which require additional support to combat the risks associated with winter work in challenging conditions.

Features and Benefits

Features the behaviour of a traditional NHL mortar
Contains no Portland Cement
Contains no modern synthetic polymers
Limits the impact of ice crystals to protect the integrity of the render
Rapid initial strength gain supports frost resistance
Minimised likelihood of shrinkage cracking
Increased water retention for an improved cure
Enhanced workability for those behind the trowel

General information

Color	Yellow
Finish	Textured
Material	Hydraulic lime Sand
Shape	Formless
Length	Bespoke
Width	Bespoke
Height	Bespoke

Uniclass	Pr_20_31_53_39 Hydraulic lime mortarsPrimary Pr_35_31_64_48 Lime renders
CAWS	M20/57 Lime:sand M20/310 Lime:sand M20/330 Proprietary lime:sand Z21/310 Lime:sand mortar mixes Z21/310 Lime:sand mortar mixes

Specification data - Hydraulic lime mortars

Mortar type	Batched dry naturally hydraulic:lime:sand.
Mix	NHL 3.5. Guidance for specification option: St Astier NHL 3.5 gauged with a small quantity of pozzolan. Due to the small gauging of pozzolan it is advised that this product should be treated more like an NHL5 strength mortar.
Colour	Natural buff.

Aggregate	5 mm down tan flint sharp sand. Other. Guidance for specification option: Other sands available on request. Consult manufacturer and insert requirements.
Density	To EN 1015-6, 1975 kg/m³. Manufacturer guidance Fresh mortar density.
Dry density	To EN 1015-10, 1770 kg/m³.
Water absorption	To EN 1015-18, 1.0 kg (m².min⁰⁵). Guidance for specification option: All samples ended test appearing saturated. Manufacturer guidance Water absorption of set and hardened mortar.
Typical compressive strength	To EN 1015-11, 6.00 MPa (at 28 days); 8.91 MPa (at 6 months). Manufacturer guidance Please note figures given are mean measurements and do not constitute a guarantee of minimum figures achieved.
Flexural strength	To EN 1015-11, 0.42 MPa (at 28 days). Manufacturer guidance Please note figures given are mean measurements and do not constitute a guarantee of minimum figures achieved.
Adhesive bond	To EN 1015-12, 0.2 N mm^². Guidance for specification option: Fracture pattern B. Manufacturer guidance Please note figures given are mean measurements and do not constitute a guarantee of minimum figures achieved.
Vapour Permeability	To EN 1015-19, 0.62 g/h.m².mmHg.
Reaction to fire classification	Class A1.