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Re: lime plastering - expected costs vs gypsum |
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| message from Jerry Built on 18 May 2004 |
I can't. This has been mentioned before. Andrew Gabriel mentioned
the problem.
Not glazing putty for windows, lime putty for lime mortar etc.
You can buy ready-made lime putty, or tip a bag of hydrated
lime into water to get the same stuff, to all intents and
purposes. I was asking about the price difference.
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| Michael Mcneil replied to Jerry Built on 20 May 2004 |
"Jerry Built" <Use-Author-Address-Header@[127.1]> wrote in message
news:IGN0LUCEEAEHBRKKB4JZD4MKCBEJEOALIELYHTHW@ziplip.com
What are you using anonymous mailers for?
Message-ID: <IGN0LUCEEAEHBRKKB4JZD4MKCBEJEOALIELYHTHW@ziplip.com>
Date: Tue, 18 May 2004 08:42:32 -0700 (PDT)
From: Jerry Built <Use-Author-Address-Header@[127.1]>
Author-Address: jerrybuilt <AT> ziplip <DOT> com
Reply-To: Jerry Built <jerrybuilt@ziplip.com>
Subject: Re: lime plastering - expected costs vs gypsum
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None of my business of course. I don't really want to know. Just nosey.
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| Anna Kettle replied to Jerry Built on 19 May 2004 |
I've not used Mike Wye's stuff myself but he's respected in the trade
Also in your neck of the woods
www.trad-lime.co.uk
www.oldhousestore.co.uk
Anna
~~ Anna Kettle, Suffolk, England
|""""| ~ Plaster conservation and lime plaster repair
/ ^^ \ // Freehand modelling in lime: overmantels, pargeting etc
|____| www.kettlenet.co.uk 01359 230642
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| MBQ replied to Anna Kettle on 20 May 2004 |
Thanks for the links!
MBQ
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| Peter Taylor replied to Anna Kettle on 20 May 2004 |
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? I guess it's a
mixture of sand and hydrated lime, but can it be used as lime mortar in the same
way as lime putty? If not, why not? I'm confused about this as all the
suppliers' literature I've seen seems to assume it is going to be mixed with
cement on site.
Thanks
Peter
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| G&M replied to Peter Taylor on 20 May 2004 |
It uses hydraulic lime which is similar to cement - add water and use
quickly. Mostly comes from France under St.Austier label I believe. Don't
use it myself - only a few miles from the Bleaklow site which sells the
authentic English non-hydraulic lime.
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| Peter Taylor replied to G&M on 21 May 2004 |
Yes that's right, but it's not the product I meant. From people like Tilcon and
Readymix Concrete Ltd you can get bulk deliveries of wet lime/sand mortar which
can be stored on site almost indefinitely (as long as it's protected from the
weather). This is mixed with Portland cement before use for bricklaying - I
don't think it will set without the cement, but maybe I'm wrong there. This
website shows what I mean: http://www.mortar.org.uk/wm_hom01.htm
I don't quite understand the difference between this product and the lime putty
mortar you would make using the Bleaklow putty, which sets on its own without
cement.
Peter
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| Anna Kettle replied to Peter Taylor on 21 May 2004 |
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 -
As well as this cement ready mix, it is also possible to get two other
different sorts of REAL lime ready mixes
Lime putty and sand readymix I use all the time. Comes by the bucket.
Take the hard graft out of mixing, just add hair, fluff up and go
The other is hydraulic lime mortar in big hoppers. This generally gets
used for newbuild
Anna
I've not heard of either of these brands which make me think that they
must be hydraulic lime mortar
Just to confuse everyone, there is hydrated lime which is dried bagged
putty lime
And there is hydraulic lime which is lime putty with impurities in
notably silicon <check this>. Hydraulic lime always comes as a dried
powder never as a putty cos one of the effects of the silicon is to
make it set underwater.
Another effect is to make it set quicker
Another effect is to make the final plaster harder; a bit more like
cement which is a BAD THING
There are weakly hydraulic limes and strongly hydraulic limes
~~ Anna Kettle, Suffolk, England
|""""| ~ Plaster conservation and lime plaster repair
/ ^^ \ // Freehand modelling in lime: overmantels, pargeting etc
|____| www.kettlenet.co.uk 01359 230642
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| Peter Taylor replied to Anna Kettle on 22 May 2004 |
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?
Peter
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| Anna Kettle replied to Peter Taylor on 22 May 2004 |
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
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| Peter Taylor replied to Anna Kettle on 22 May 2004 |
Anna Kettle wrote
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
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Archived message: Re: lime plastering - expected costs vs gypsum (UK DIY Home Decoration)
