Finish with an open texture, set back from the face and not covering the masonry units. The O and K type mortars have a higher amount of lime in the mix … Before, In Progress, and After South Wall: The “Lost” World of Lime Mortar. Bricks of the 19th century through to even the 1950’s are more porous than today’s bricks. Years of research on how to make quicklime into lime putty and what ratio of lime putty to mix with sand to form the appropriate mortar for a row house built in 1832. As for the mortar the lime content should not be important for the lifetime, but you can add a bit for better workability. You guys do realize that mortar is a mix of lime, Portland Cement and sand. Many old buildings were layed using what they called "Lime Mortar" - it contained little if any cement. But a weak acid wash, immediately followed by clean water after the mortar has set will easily clean it up. Lime mortar is a type of mortar mix that was very popular with skilled artisans and masons during the late 1800s and 1900s. If you’ve ever seen a brick wall where the faces of many of the bricks are blown clear-off, you’ll understand the effect. We take out the crumbling rotting mortar and put new in. Available in 12 stock colors and 3 different grades: Coarse(G) to be used for joints over 3/8″ Fine (F) to be used for joints between 1/4”-3/8” It has taken years to build up the courage to face our basement wall. Generally there should be no or very little lime in a stone wall. Hydraulic Lime for Mortar for Stone Brick and Block Masonry. Lime mortars for lime pointing are generally softer and more porous compared to mixes using cement therefore allowing moisture to evaporate from the joints more freely. To reiterate, cement and soft stone/brick do not mix!. Published by Donhead ISBN 1873394640. The new mortar should consist of 1 part of portland cement and 2-3 parts of sand. The type of mortar used to repair the crumbling joints is the most important factor. Press the mix well into the joints, knock back and then tend the mortar as it goes off. Lime mortar takes much longer to cure than does portland cement. This can help to lower moisture levels in the wall and reduce the build up of soluble salts in the stone face, therefore reducing potential damage or ‘spalling’ of the masonry. Stones are naturally porous as well. The beauty of lime mortar is that it allows the stones to “breathe” and “flex”. Lime mortar is still popular for use on older Victorian style or brick homes that were made many years ago. We determine this by what type of stone the wall is made of and the condition the stone is in. Hot mixed mortar is best, especially in damp walls, but be careful of health and safety. The process of fixing crumbling mortar in a stone wall is quite tedious, but it’s also pretty simple. It also did not weather well. 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