Re: SB: Lime vs Portland Plaster

[Charmaine R Taylor <tms@northcoast.com>]

Pat, lime plasters/mortars have been used since before Roman times,
mostly in the cold harsh seacoast of Scotland where lime plasters
actually protect stone/granite walls from cracking.  the lime is applied
over the granit/estone and the sea spray and salts slowly erode it, so
it is considered a sacrificial coating, even with harsh Canadian winters
the lime walls don't need extra protection, but the bales will.  so wide
overhangs prevail.

The only lime I have used over cement is over cement cinderblocks- we
first painted and wetted the blocks with limewater to create a beginning
bond..then plastered over with a thin lime sand "scratch coat" with some
clay for color.  But you might try a  thin lime sand plaster over the
rough coast, wetting it first with limewater, let cure for 2 weeks, then
try a another lime coating. I don't have other experience, but maybe
someone else does.

cemented walls where cement was used to point bricks have been cleaned,
and roughed, then lime mortar placed, and that works.  there is a book
from Historic Scotland [Case Studies of traditional lime harling-Ii
believe is the title] ( I no longer carry it- Historic Scotland- Books
on Lime & Earth Materials- go to the technical books page:
http://www.historic-scotland.gov.uk/sw-frame.htm
- you can order direct from them) that was all about lime/cement
replacement on historic buidings where cement was ruining the brick
walls- cracking, etc.

Here is an article online about SB & lime/cement renders..which address
this:
Lime in construction use: SB  in AU site   Article-
http://barney.webace.com.au/~agstraw/lime.html
 http://barney.webace.com.au/~agstraw/

also a good site:
The Building Conservation Directory  email: bcd@CathComm.demon.co.uk
website www.buildingconservation.com   The Directory  gives details on
architectural salvage (i.e. recycled building materials) and information
on lime mortars.

Ms. Charmaine  Taylor/ Taylor Publishing
http://www.dirtcheapbuilder.com
http://www.papercrete.com
PO Box 375, Cutten CA 95534
707-441-1632





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