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Gervase

Joined: 17 Nov 2004
Posts: 8655

Posted: Mon Jun 11, 07 5:21 pm Post subject:

Armchair wrote:

I think I'll stick with improving underfloor ventilation and plastering with a lime-based plaster.

By far the best option - and the cheapest. It's best to avoid using any cementitious mortar or plaster on rubble or cob - it's not good for it.
Do check all soil levels outside to make sure they're a good six inches below internal floor levels, as well.

Milo

Joined: 16 May 2005
Posts: 342
Location: Oop North-ish.

Posted: Tue Jun 12, 07 2:07 pm Post subject:
https://www.aecb.net/

Armchair

Joined: 14 Jan 2007
Posts: 205
Location: Winchester

Posted: Thu Jun 14, 07 7:43 am Post subject:
Any ideas on what ratio the plaster needs to be? I've been hunting around on Google for some advice but can't seem to find anything concrete (please excuse the terrible pun).

Gervase

Joined: 17 Nov 2004
Posts: 8655

Posted: Thu Jun 14, 07 7:45 am Post subject:

One part hydrated lime (or lime putty) to three parts sharp sand. If you want a particularly smooth and hard top surface, use 1:1 silver sand and lime as a skim coat.
For more advice on cob, try to find a copy of Jane Schofield's Cob Buildings - A Practical Guide. You should be able to get it from Black Dog Press. Jane herself is hugely knowledgable and helpful, and is also the author of the indispensible Lime in Building - A Practical Guide.
If you're not far from Winchester, make contact with Bob Bennett at The Lime Centre at Morestead.
He runs courses in plastering and rendering and can also supply all the materials you might need. The site also has some useful fact sheets you can download.

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