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 in the colour buff.

Engineered with precision, 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.

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.

Features and benefits:

The lowest strength of the marine mortar range
Roughly 8-10 hours of working time at 17°C
Features an attractive off-white natural finish
Contains no Portland Cement
Contains no synthetic polymers
Designed for flexibility and an aesthetic natural finish
No pigments to prevent colour fading
Maintains the natural colour of the sands
Features an attractive off-white natural finish

UKCA Mark Mortar - Marine L4 Coarse Mortar