rendering cotswold stone

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Fair comment Spunkey but i was refering to applying S+C directly to the older house you are quite right though i remember building paper used behind expanded metal lathe years ago to separate the render from the building this may stop the cracking by isolating the render from the movement of the house but it dosent cure the damp issue maybe some kind of air vent could be designed for this.Some years ago i used an expanded metal which had a breathable backing on it for use on timber frame it worried me at the time but that was a good 20 years ago but the house still looks good now.I mentioned before that there are some issues with expanded metal lathe expanding at a different rate than the render causing the render to crack but ime yet to see the proof, Weber still advocate the use of chicken wire in some of their OCRs so i would think they would know. Their are some OCRs on the market which claim to be lime based and breathable but the trouble is most of the older properties need to be dubbed out so much to get a flat surface to take the OCR that it has to be done in S+C which defeats the object.Does anyone have any knowledge of insulated renders as this may be the way forward as long as they can be vented to let the building breath.
Lucius
 
Thats cause the timber these days is so green its almost still got leaves on, you have not got a chance imo
 
A few years ago we had a whole building to k rend on timber frame stud,ply then riblath year later you should see the cracks
 
the bit i dont understand is if we do create an independant render set on old stone walls ....does it still matter if it needs to breathe? in the olde days they made as good as poss with building materials available
 
Yeah Spunk it does matter but your right years ago people used what was available in the Vernacular is the term as is my house built from the rock from the mountainside it is built on all laid in earth 200years old and no serious probs other than what has been interefered by some modern methods. The major problem with breathing ocours at ground level as their is no DPC and this is where the lime comes into it as it allows any rising damp to exit through the wall above this level this would probarly not be a problem using sand and cement but then other problems ocour because the sand and cement is to rigid for the more flexible lime built structure and cracks during thermal movement causing water to get behind the render causing a host of other problems.
Lucius
Going to bed now got to go to airport in morning to pick mother in law up she is only staying for a month cant wait ???
 
;D ;D.........good luck mate ............and thats cleared up that little debate ;)
 
Pug said:
arrgh! been following this one with interest, church, i'm rendering the inside of a mates stone farmhouse in france next week. i was just gonna sbr slurry it and render as normal, do you reckon i'll get away with it?
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How did it go in France pug?
Problem i find is the only sand i can ever get hold of is sharp sand over there!
 
i mixed sharp with building sand half and half but it was lifeless! mate was pleased as punch tho. traditional way of doing it was clay,sand, straw and lime, called columbarge (i only know cause i spoke to an expat builder when i was out there) places done the old way looked better in my opinion
 
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