Ionic Natural Hydraulic Lime 3.5 Old White mortar is a natural product with a long history of application and success. The lime mortar gets stronger over time so they create a long term benefit to the stone buildings and monuments. The lime mortar also provides vapour permeable underlays for breathable building construction providing a barrier to minimise the wind uplift load acting on slates and tiles while providing a secondary barrier to the ingress of wind-driven snow and dust. Ionic NHL 3.5 Old White mortar is a flexible media which is more lightweight and has better adhesion than cement mortars. To reduce carbon footprints, Ionic NHL 3.5 Old White mortar can also be removed from building structures and recycled with little effort.