[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

GSBN:RE: GSBN Lime plaster problems



<x-charset windows-1250>
Hi Derek and all

Afraid I have been having problems with my email's so have been unable to
respond to all your inputs?.which are hugely appreciated.

Just to explain Derek, yes we did the plastering in late April early
May...i.e. autumn just before winter kicks in....the problems only seemed to
become apparent further down the line. 

The site is in Kokstad, which is well inland quite near the Lesotho and
Drakensburg highlands. The winters are generally very dry with sunny days
average daily temperature about 16 - 18 degrees, with cold nights (no cloud
cover) getting down to just below freezing in the early morning....hence it
is usual to experience frost in the early morning. While there are lovely
warm days, winds are cold and during the heavy cold fronts they normally get
snow on the neighbouring mount Curry which is only a few km away and
sometimes even on the ground in Kokstad. Further to add there is much snow a
150km to the north in the Drakensburg mountain range that usually hangs
around on the mountain tops for at least half of winter and especially after
the major cold fronts, which bring chilly winds down from those mountains.

We will only be re-appling the plaster when I get to the bottom of this all,
which should be early summer again.

Just to also mention that this site is about 1000 km from my home in Cape
Town, so my visits are quite irregular and usually quite pressured.
In retrospect, when the strong winds and cold weather conditions started I
should have rather packed up and persuaded my client to wait until after
winter.

Thanks
Andy


-----Original Message-----
From: Derek Roff [<a  target="_blank" href="mailto:derek@unm.edu";>mailto:derek@...] 
Sent: 11 October 2007 03:46 PM
To: Andy Horn
Subject: RE: GSBN: Lime plaster problems

Thanks for your response, Andy.  Did you also post this information to 
the GSBN list?  I suspect others would be interested.  Your questions 
stimulated a lot of interesting discussion.

Derek

--On Wednesday, October 10, 2007 9:20 PM +0000 Andy Horn 
andy@... wrote:

> Hi Derek
>
> Afraid I have been having problems with my email's so have been
> unable to respond to all your inputs?.which are hugely appreciated.
>
> Just to explain Derek, yes we did the plastering in late April early
> May...i.e. autumn just before winter kicks in....the problems only
> seemed to become apparent further down the line.
>
> The site is in Kokstad, which is well inland quite near the Lesotho
> and Drakensburg highlands. The winters are generally very dry with
> sunny days average daily temperature about 16 - 18 degrees, with cold
> nights (no cloud cover) getting down to just below freezing in the
> early morning....hence it is usual to experience frost in the early
> morning. While there are lovely warm days, winds are cold and during
> the heavy cold fronts they normally get snow on the neighbouring
> mount Curry which is only a few km away and sometimes even on the
> ground in Kokstad. Further to add there is much snow a 150km to the
> north in the Drakensburg mountain range that usually hangs around on
> the mountain tops for at least half of winter and especially after
> the major cold fronts, which bring chilly winds down from those
> mountains.
>
> We will only be re-appling the plaster when I get to the bottom of
> this all, which should be early summer again.
>
> Just to also mention that this site is about 1000 km from my home in
> Cape Town, so my visits are quite irregular and usually quite
> pressured. In retrospect, when the strong winds and cold weather
> conditions started I should have rather packed up and persuaded my
> client to wait until after winter.
>
> Thanks
> Andy
>
> ECO DESIGN
> Architects &amp; Consultants
> A. R. HORN B.A.S. (UCT), B.Arch (UCT), Pr.Arch (SACAP),       MIA, CIA
> Telephone: 021 462 1614, Fax: 021 461 3198
> Cel: 082 67 62110
> 4th Flr, The Armoury
> 160 Sir Lowry Rd
> CAPE TOWN
> 7925
> web site:  HYPERLINK www.ecodesignarchitects.co.za
> www.ecodesignarchitects.co.za
> email: andy@...
>
>
> -----Original Message-----
> From: Derek Roff [<a  target="_blank" href="mailto:derek@unm.edu";>mailto:derek@...]
> Sent: 27 September 2007 02:05 PM
> To: GSBN; Andy Horn
> Subject: Re: GSBN: Lime plaster problems
>
> --On Wednesday, September 26, 2007 6:37 PM +0000 Andy Horn
> andy@... wrote:
>
>> On the first morning after applying the plaster the weather
>> turned at night and brought frost...2 months ahead of when it is
>> normally expected! There were sheets of ice in the water buckets
>> that morning!
>
> I am curious about the comment that this freeze was 2 months _ahead_
> of the expectation.  I'm thinking that, as of the date of Andy's
> message in late September, South Africa is moving into Spring and
> looking forward to the warmer temperatures of summer.  Perhaps the
> plaster was applied in April or May?  Andy, can you clarify what
> temperatures were "normal" when the plaster was applied, what the
> normal freezing season is like (and when), and what weather you
> expect from now into the next few months, when you will be
> re-applying the plaster?
>
> A few more questions come to mind from your description of the
> problem.  There is a great deal of variation between different lime
> sources/stocks.  Is there an alternative to hydrated lime that you
> used?  Is this brand of lime generally reliable when used in the
> manner that you applied it?  Is it possible that the bags of lime
> which you used had been stored improperly or were very old?  Does
> soaking this specific lime for days or weeks prior to application
> have a significant positive effect on this lime's working properties?
> (While hydrated lime is slaked at the factory, some members of the SB
> lists report that their hydrated limes get better with soaking).  Did
> anyone do test samples of this lime, using your mix and application
> techniques?
>
> You mention adding a small amount of adobe soil to the render mix.
> Soils vary tremendously, and some of them are not happy companions
> with lime.  Some soils and mix ratios can decrease the strength
> and/or adhesion of the render.  Is there a compelling reason to
> include the soil in your mix?  If so, testing various mixes and
> ratios could be enlightening.  Please tell us more about how much
> adobe soil was added, and if possible, what the pH of the soil is.
>
> Derek
>
>
> Derek Roff
> Language Learning Center
> Ortega Hall 129, MSC03-2100
> University of New Mexico
> Albuquerque, NM 87131-0001
> 505/277-7368, fax 505/277-3885
> Internet: derek@...
>
> No virus found in this incoming message.
> Checked by AVG Free Edition.
> Version: 7.5.488 / Virus Database: 269.13.30/1030 - Release Date:
> 2007/09/25 08:02 AM
>
>
> No virus found in this outgoing message.
> Checked by AVG Free Edition.
> Version: 7.5.488 / Virus Database: 269.14.1/1050 - Release Date:
> 2007/10/04 05:03 PM
>



Derek Roff
Language Learning Center
Ortega Hall 129, MSC03-2100
University of New Mexico
Albuquerque, NM 87131-0001
505/277-7368, fax 505/277-3885
Internet: derek@...


Internal Virus Database is out-of-date.
Checked by AVG Free Edition. 
Version: 7.5.488 / Virus Database: 269.14.1/1050 - Release Date: 2007/10/04
05:03 PM
 

 

Internal Virus Database is out-of-date.
Checked by AVG Free Edition. 
Version: 7.5.488 / Virus Database: 269.14.1/1050 - Release Date: 2007/10/04
05:03 PM
 


--- StripMime Report -- processed MIME parts ---
multipart/alternative
  text/plain (text body -- kept)
  text/html
---