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UK diy (uk.d-i-y) For the discussion of all topics related to diy (do-it-yourself) in the UK. All levels of experience and proficency are welcome to join in to ask questions or offer solutions. |
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#41
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lime plastering - expected costs vs gypsum
Anna Kettle wrote
What is the "ready mixed" lime mortar you can get from people like Tilcon or RMC and how does it differ chemically from lime putty mortar? all the suppliers' literature I've seen seems to assume it is going to be mixed with cement on site. This website shows what I mean: http://www.mortar.org.uk/wm_hom01.htm The mix which this company sells is probably hydrated lime and sand. When the cement is added, there is just a normal cement set, with the lime acting as a plasticiser for the mix But had the cement not been added, yes the ready mix is chemically similar to lime putty mortar - just add water - Thank you Anna. So if they are chemically similar, why is it necessary to use lime putty rather than simply mix sand, hydrated lime and water? Peter |
#42
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lime plastering - expected costs vs gypsum
Thank you Anna. So if they are chemically similar, why is it necessary to use
lime putty rather than simply mix sand, hydrated lime and water? If you buy hydrated lime then ts best to soak it in a tub of water for a day or two which makes it nice and plastic remarkably like lime putty ;-) Lime putty gets better with age as it soaks in the water so bought lime putty will be a better quality than a quick two day soak will provide. I like to use lime putty which is at least six months old. Anna ~~ Anna Kettle, Suffolk, England |""""| ~ Plaster conservation and lime plaster repair / ^^ \ // Freehand modelling in lime: overmantels, pargeting etc |____| www.kettlenet.co.uk 01359 230642 |
#43
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lime plastering - expected costs vs gypsum
Anna Kettle wrote
Thank you Anna. So if they are chemically similar, why is it necessary to use lime putty rather than simply mix sand, hydrated lime and water? If you buy hydrated lime then ts best to soak it in a tub of water for a day or two which makes it nice and plastic remarkably like lime putty ;-) Lime putty gets better with age as it soaks in the water so bought lime putty will be a better quality than a quick two day soak will provide. I like to use lime putty which is at least six months old. Anna ~~ Anna Kettle, Suffolk, England |""""| ~ Plaster conservation and lime plaster repair / ^^ \ // Freehand modelling in lime: overmantels, pargeting etc |____| www.kettlenet.co.uk 01359 230642 Got it! I've been pondering about that for years - it's just a matter of quality and plasticity. Thank you for sorting it out for me. Peter |