A ready mixed natural hydraulic lime mortar for building and pointing applications at the roofline with a medium texture and refined tan coloured finish. Available in a 25kg bag.
£16.48 £19.78 inc VAT
Estimated lead time is 3-5 business days
Minimum order quantity of 20 bags
Cornerstone Performance Roofline Medium is a dry-ready mixed natural hydraulic lime mortar for roofing applications. It is available in the colour tan. Custom colours, including grey, are available upon request.
Manufactured by Cornerstone using 100% pure natural hydraulic lime, natural sands, and additives to create high-performance mortar for building and pointing roofline applications. This roofline mortar is explicitly designed for an improved performance on sloped surfaces, maintaining shape and consistency to reduce slump and sag, while an extended working and finishing time makes for a no-fuss application. Available as standard with Saint-Astier® NHL5. Other binders and mix ratios are available upon request.
As part of the Cornerstone Performance range, each product has been engineered with precision to enhance performance, workability, and effectiveness for each specialist application.
Well-suited for angled or pitched roofs, with additional workability even when used stiff or projects requiring a tan mortar to match the roofline.
With a diverse range of lime-based products, Cornerstone defies the standard one-size-fits-all approach, providing refined solutions to tackle each project effectively. Their products can be found on prestigious buildings worldwide, blending innovation with tradition to meet evolving industry needs.
As with any natural product, variations in colour, texture and shape may occur. In addition, images may vary slightly from actual products due to these natural variations and screen resolution. For the best consistency, ensure to acquire a sufficient amount of material with your order to avoid batch-to-batch variation.
Suitable for external use, where the binder strength is appropriate for the host background or surface.
Well-suited for roofline applications, including on ridges, verges, hips, and pointing gables. Cornerstone Roofline Medium prefers masonry with a degree of suction, so units like glazed tiles may be more challenging to work with. Get in touch for more information on these types of applications. Appropriate for various project types, including conservation, renovation, or sustainable construction.
A 25kg bag yields approximately 15 litres of lime mortar. Coverage cannot be estimated accurately due to variations in bed depth and slate width. 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.
See the Technical Data and Documentation section for detailed product information, application guidance, and datasheets. Always review any available documents before use. Each project is unique, always seek professional advice before undertaking a project.
When working with lime, an alkaline material, always ensure you wear the appropriate PPE. Browse our range of tools and PPE to get started.
Store in indoor covered and dry conditions, protected from environmental conditions, including water, damp or frost and clear from the ground. Always reseal packaging if product is still present.
Do not use in temperatures below 5°C or above 30°C, or if freezing conditions are predicted within the following few weeks, including wind chill. We always advise following best practices for curing and protecting fresh lime renders and plasters. Protect from adverse environmental conditions, including frost, rain, direct sunlight and drying winds.
Brand
Cornerstone
Binder
NHL5
Colour
Tan
Material
Natural Hydraulic Lime, Natural Sands, Additives, Pigments
Work
Roofing
Use
External
Application
Manual
Mix Ratio
1:2
Aggregate
3mm down flint sand
Yield
A 25kg bag yields approx. 15 litres
Always read any available datasheets and documentation before use.
Stock Quantities and Lead Times
Stock quantities and lead times are estimated and may differ or increase based on the order size and shipping method. If your timeline is sensitive, get in touch with the team.
Palletforce
Pallet orders with Palletforce Economy are typically dispatched from Cornish Lime within 1-2 business days, providing your item is in stock and not made-to-order. Once dispatched, Palletforce will deliver your order within 3-5 business days, depending on your location. Please ensure that your site can accommodate articulated lorries or similar-sized vehicles.
Local Delivery
The Cornish Lime team provides local delivery with a 18-tonne vehicle with a crane to assist with unloading. You will be contacted by phone to arrange delivery and ensure your site can accommodate our vehicle.
APC Parcel Courier
Orders shipped by APC parcel courier are typically shipped the next business day and arrive within 2-3 business days, providing your item is in stock and not made-to-order. APC will contact you via email with delivery information, and orders can be tracked on the APC website.
Premium or Expedited Service
For a premium or expedited delivery service, please get in touch to discuss if this option is available for your order.
For further information, see our delivery information page.
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