Roz Posted November 24, 2019 Author Share Posted November 24, 2019 (edited) 46 minutes ago, scottishjohn said: Is this the right time of year to be doing lime mortar building ? Iwas ubde the impression it was a summer job building with lime mortar,due to its drying time I think the main issue is frost damage (Just from reading online), but we're down in Cornwall and whilst it's chilly, we are OK at the moment. I should have done it earlier, but didnt get around to it, and now we have a lot of water coming into the building as we've knocked the rest of the old pointing (earth) out... so need to get it plugged up! Edited November 24, 2019 by Roz Link to comment Share on other sites More sharing options...
scottishjohn Posted November 24, 2019 Share Posted November 24, 2019 (edited) 6 minutes ago, Roz said: I think the main issue is frost damage (Just from reading online), but we're down in Cornwall and whilst it's chilly, we are OK at the moment. I should have done it earlier, but didnt get around to it, and now we have a lot of water coming into the building as we've knocked the rest of the old pointing (earth) out... so need to get it plugged up! not going to dry up at all this winter -- and if it gets wet it will melt and run down the stone work and stain it -- I suspect you need to cover it with sheet to stop that happenning . frost can only cause damge it there is free water to freeze Edited November 24, 2019 by scottishjohn Link to comment Share on other sites More sharing options...
Roz Posted November 24, 2019 Author Share Posted November 24, 2019 Just now, scottishjohn said: not going to dry up at all this winter -- and if it gets wet it will melt and run down the stone work and stain it -- I suspect you need to cover it with sheet to stop that happenning Yeah we have a big roll of Hessian on the go and keeping an eye on the forecast. The first batch I did seems to have dried out OK so far, at least on the surface. Hopefully there will be enough gaps in the weather to work around it! Link to comment Share on other sites More sharing options...
scottishjohn Posted November 24, 2019 Share Posted November 24, 2019 (edited) 3 minutes ago, Roz said: Yeah we have a big roll of Hessian on the go and keeping an eye on the forecast. The first batch I did seems to have dried out OK so far, at least on the surface. Hopefully there will be enough gaps in the weather to work around it! will hessian not hold water when it gets wet and let it through and then freeze plastic sounds abetter choice I think the idea of hessian is to allow it to breathe and let water evaporate --can,t see much of that going on for ther next few months if the hessian is soaked with rain Edited November 24, 2019 by scottishjohn Link to comment Share on other sites More sharing options...
jfb Posted November 24, 2019 Share Posted November 24, 2019 On a hot summer day you would use hessian dunked in water to cover lime pointing as you want the lime to dry out slowly - too fast and it won't set properly. Protection from rain is maybe more important in these months so hessian or some sheeting can help with that. I have found it surprising how much you can get away with lime pointing in the cold and have rarely had it blow because of frost damage. Just make sure the mix is pretty dry. Even cover up a wall you will be working on for a few days before to stop it getting soaked before you point it. Also - if it has set a bit too much before you try to finish up the pointing a wire brush can help - I don't like the lines you sometimes get with them so you can bash away at the pointing with a churn brush afterwards and that can get it where you want it. 1 Link to comment Share on other sites More sharing options...
Onoff Posted November 24, 2019 Share Posted November 24, 2019 44 minutes ago, jfb said: churn brush I know I could Google it but??? Link to comment Share on other sites More sharing options...
mvincentd Posted November 24, 2019 Share Posted November 24, 2019 13 hours ago, Onoff said: SPAB is oriented to ancient buildings, so flint in that context will have been laid with 'proper' lime mortar, so shouldn't then be pointed with cement. Ask one of the big flint block makers like https://southdownsflint.com/about/ what they are setting their flints into... Link to comment Share on other sites More sharing options...
Ferdinand Posted November 24, 2019 Share Posted November 24, 2019 Historic Houses Association may have some guidance material. Link to comment Share on other sites More sharing options...
jfb Posted November 24, 2019 Share Posted November 24, 2019 2 hours ago, Onoff said: I know I could Google it but??? Stiff brush - basically a broom in a hand held brush! Link to comment Share on other sites More sharing options...
mm289 Posted November 28, 2019 Share Posted November 28, 2019 @Onoff what @mvincentd said, I suspect the SPAB advice is referring to walls originally built in lime, for the small infill patch you are doing I doubt it will make any difference? @scottishjohn it is getting late in the year now for lime pointing/laying but the main risk is frost or freezing. If the brickwork is covered from direct water it will have a chance, but this time of year I would be using an NHL mix not putty. In my experience the putty takes a lot longer to go off sufficiently to not be at risk, whereas NHL will be OK after 2-3 days even in lower temps. Once we are in Dec/Jan I would be very careful with weather though, we tend to try and do inside jobs over the winter but have had significant outside pointing/brickowk done upto end Oct/early Nov with no probs. Cheers, MM Link to comment Share on other sites More sharing options...
SteamyTea Posted November 29, 2019 Share Posted November 29, 2019 On 24/11/2019 at 08:31, scottishjohn said: Is this the right time of year to be doing lime mortar building ? Iwas ubde the impression it was a summer job building with lime mortar,due to its drying time From what I have read and heard, there is never a good time to use lime. It is either too cold, too hot, too dry, to wet, too sunny, too dark, too windy, too calm. I wonder why people bother with it. Link to comment Share on other sites More sharing options...
jfb Posted November 29, 2019 Share Posted November 29, 2019 Every day is a good day to use lime! Well maybe not if it is really freezing, but then not so good for cement either. 7 hours ago, SteamyTea said: I wonder why people bother with it. How about for starters - at the end of the building's life cycle you will be able to reuse materials you couldn't with cement. Link to comment Share on other sites More sharing options...
SteamyTea Posted November 29, 2019 Share Posted November 29, 2019 2 hours ago, jfb said: How about for starters - at the end of the building's life cycle you will be able to reuse materials you couldn't with cement. Concrete gets crushed into hardcore. Link to comment Share on other sites More sharing options...
Onoff Posted November 29, 2019 Share Posted November 29, 2019 Just now, SteamyTea said: Concrete gets crushed into hardcore. Exactly! Like asbestos gets broken up and quietly buried...old engine oil gets burnt...cess pool gets pumped down the road when its heavily raining... ? Link to comment Share on other sites More sharing options...
SteamyTea Posted November 29, 2019 Share Posted November 29, 2019 6 minutes ago, Onoff said: quietly buried Not sure how different lime and Portland cement are chemically, that is one for @Jeremy Harris, but as concrete is used for foundations, I can't see that it is a problem (under current legislation). Not a lot we, as individuals, can do about large organisations breaking, or bending the laws and rules (short of direct action sabotage). Link to comment Share on other sites More sharing options...
jfb Posted November 30, 2019 Share Posted November 30, 2019 12 hours ago, SteamyTea said: Concrete gets crushed into hardcore True. But what is the value of a whole brick/block/stone compared with a crushed brick/block? Link to comment Share on other sites More sharing options...
SteamyTea Posted November 30, 2019 Share Posted November 30, 2019 34 minutes ago, jfb said: But what is the value of a whole brick/block/stone compared with a crushed brick/block? Don't understand the question. Or how it relates to lime compared to OPC. Link to comment Share on other sites More sharing options...
Triassic Posted November 30, 2019 Share Posted November 30, 2019 If you use lime to build your stone or brick house, you will be able to remove said line and reuse the stone or brick. If you use OPC you won’t be able to remove it and your only option is to crush the lot to be used as low value hardcore. Link to comment Share on other sites More sharing options...
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