A ready mixed natural hydraulic lime mortar suitable for exposed freshwater and saltwater applications above the water level with a refined buff coloured finish. Available in a 25kg bag.
£14.98 £17.98 inc VAT
Estimated lead time is 3-5 business days
Minimum order quantity of 20 bags
Cornerstone Marine L4 is a dry ready mixed hydraulic lime mortar designed for exposed marine applications above the water level. Among the marine range, the Marine L4 stands out as the lowest strength and slowest setting, yet it enables a more capillary-active and vapour-permeable marine mortar, with a set time of approximately 8 hours at 17°C. Available with two finishes, a coarse buff finish as standard or medium by request.
Manufactured by Cornerstone using natural hydraulic lime and natural sands to create a high-performance mortar for freshwater and saltwater applications, allowing for a more capillary active marine mortar with a slower setting time and additional flexibility. Further, a longer open time makes this mortar undemanding to apply and finish. Available as standard with Saint-Astier® NHL5.
As part of the Cornerstone Marine range for building and pointing water-bearing masonry, this ready-mixed natural hydraulic lime mortar is the lowest strength of the Marine mortar range.
Well-suited for fresh or saltwater environments above the water level, where a fast-set is not required, or the project requires the absence of Portland Cement.
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.
Relevant for marine building and pointing work applications, including freshwater and saltwater environments above the water level, where tidal washout poses minimal risk. For a faster setting time or for areas submerged underwater, explore Marine LP6. Appropriate for various project types, including conservation or renovation.
While Marine L4 is entirely natural in colour and absent of any pigments, the environmental conditions and curing process will affect the final colour achieved. As such, we are unable to create custom colours for this product. For colour-sensitive projects, our team can provide guidance on curing methodology.
A 25kg bag will produce approximately 14.5 litres of mortar and fill roughly 1.5m² of joint at a depth of 10mm. The width and depth of the joint will influence this estimation. On-site trials are advised for the best yield indication for your specific project.
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.
The working or open time of Marine L4 is variable depending on environmental temperatures. 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 mortars. Protect from adverse environmental conditions, including frost, rain, direct sunlight and drying winds.
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
Buff
Material
Natural Hydraulic Lime, Natural Sands
Work
Pointing, Building, Bedding
Use
External
Application
Manual
Mix Ratio
2:5
Aggregate
5mm down sharp washed flint sand
Coverage
A 25kg bag covers approx. 1.5m2 for pointing applications at a 10mm depth
Yield
A 25kg bag yields approx. 14.5 litres
Set Time
Approx. 8 hours at 17oC
Strength
5.5 Nmm 2 as a mean measurement with a w/c ratio of 0.96. *Not a guaranteed minumum
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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