12/9/2023 0 Comments Lime puttyThere are many who advocate the use of limes in almost every conceivable instance, a fad propogated by eccentrics and over enthusiastic hair brained morons. as your previous statements would testify to.įor ther record I am not advocateing the use of lime putties ad hoc, but merely by useing a degree of acumen each individual project should be taken on its merits and appropriate actions taken upon reflection of what is suitable. I hope you are never invited to repair any description of listed property.I can imagine the scene " Allright lads, empty the van of that B& Q bagged sand and knock up some 3:1 gobbo and lets get this grade 1 listed building repointed before those fruitcakes from the heritage society come along and stop us.Or do they encourage this kind of vandalism Y.B. Lime mortars have been around for thousands of years wheras opc cements were only invented in the mid 1800's. Stone decay is a major problem in vast amounts of building stock a problem which is compounded, when after 150 years they are repaired with inapropriate materials. There is an infinite amount of building stone much of which will perish over time,So to state that stone does not decay full stop is preposterous. Then clearly your experiences are limited,and your discernment of theese issues ill conceived and inaccurate if you truly believe as you clearly state that "there are countless such buildings throughout the land and all of which are repointed will have a sand/cement mortar" I could go on but I am sure you get the picture and it is disturbing that those views you hold are shared by many proffessionals and the practitioners who are charged with the care and repair of much of our old building stock This water can start to condense in cold weather encourageing all manner of other damp related problems. Cement mortars trap moisture within the fabric causing crystallisation in the stone around the mortar joints as there is no permeable escape. Limes as bedding joints are permeable and allow for a route for the passage of mortar from the core of the wall to the surface where it evaporates. Stone decay is by the use of impermeable opc mortars. As the stone or brick is usually less hard than the cement it is this that will fail.Īs a rule you should allways use the original match of material. Any movement which occurs introduces stress in the narrow bands of rigid mortar which is only relieved by the failure of the stone.the brick. The use of opc in todays construction as I stated is compemented by modern materials as the brick used is stronger than the mortar, but problems arise when hard cement mortars is used to repoint a traditional wall because the shallow depth of of hard cement mortar at the surface is rigid whilse the body of the wall behind is flexible. This does not mean it will stay in its current form for a few million more years does it? Well of course it has been in the ground for millions of years but then it is quarried and dressed and used for construction.
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