What is hydraulic lime mortar?
Hydraulic lime mortar is a lime mortar that hardens in damp or even wet conditions through a chemical reaction rather than exposure to air. (This is in contrast to standard, or non-hydraulic lime mortars, which harden by absorbing carbon dioxide, a process known as carbonation.) Hydraulic qualities are created when clay is included in the lime mixture. We recommend hydraulic lime mortars for buildings or building components (like chimneys) that are located in damp conditions or suffer a lot of weathering.
