Lime mortar has been used since 7000BC and remains unsurpassed in traditional construction for its drying properties. One has only to look at the Hill House Box to see what happens where cement harling is used in its place…
Lime mortar is moisture permeable. Cement is not. Using cement mortar creates a layer of impermeability that merely displaces the wet, putting greater pressure on the surrounding masonry or forcing the problem underground. The consequence is penetrating and/or rising damp. Lime mortar, on the other hand, will sacrificially protect the masonry from damp, since moisture can move freely through the capillaries in the lime, keeping the building dry. For the same reason, damp proofing – using plastic membranes, chemical injections and physical cement barriers – is a false economy and is actually a major cause of damp.
With immense dedication, Mike and Jamie @heritageplastering have transformed the walls of the Lamb and Flag. Their lime rendering and plastering articulates the contours of this 16th-century building. The result has cured our damp problem and is in itself a work of art.
3 months ago