[Strawbale] Plaster on old stone wall

[permacultura at libero...]

I always prefer to wet the wall before plastering because of the nature of 
clay: clay particles tend to penetrate better in the crevices of rocks or other 
materials when you hydrate the surface.
I usually do not use any net, but depend on the quality of clay as well. It 
happened to me using commercial clay plaster they did not have the bonding 
capacity needed to hang on the wall; very low quality. My clay is very sticky 
and I do not need any net. I often use jute net  (in between II and finishing 
coat) when I am not sure of the quality of the mix or the application (i.e. 
during courses). It really prevent cracking.
I always prefer to do tests to see the adhesive strength, resistance to 
breakage etc. before use a plaster I do not know.
cheers
Stefano Soldati


skype: stefanosoldati
www.laboa.org




>----Messaggio originale----
>Da: forum at lamaisonenpaille...
>Data: 22/03/2011 18.14
>A: "European strawbale building discussions"<strawbale at amper....muni.cz>
>Ogg: [Strawbale] Plaster on old stone wall
>
>Hello Jure,
>
>Please change keep the 'subject' relevent to the subject treated in your 
>messages.
>>
>> Hi again,
>>
>> Does anybody have expirience with applying interior clay plaster on an 
>> old stone wall in the house (which had lime plaster previously/we 
>> would now remove some of the old lime plaster and leave the good parts).
>yes
>> If yes, does the wall have to be wet when applying the clay plaster
>It is allways adviced to wet a surface before applying earth plaster but 
>it is not a total dissaster if you don't.
>> and must there be a net applied before plastering?
>A net is needed when the surface of the support is not regular or 
>homogenous. If your wall is only stone and lime mortar (no wood for 
>instance) netting would not have to be used. I like using a base coat 
>using a high clay content soil with as much as chopped straw as I can 
>get in so that it is easy to fill out uneven spots.
>
>Bye,
>André
>France
>>
>> Cheers
>>
>>
>> Jure Požar
>>
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>>
>
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