we had a structural engineer around to check out the roof (joists and all) and take a little look at 'those' cracks. we were in the mind that we may have to 'stitch' the cracks using cob blocks or what, but the engineer confirmed that they would be fine just being stuffed. he seemed to think that they had been there for perhaps 200 years - cob always has a tendancy to shrink when it dries out and this may just be the result.
so we took some of the material we'd previously removed from the walls (such as blown earthern plaster) took a trip up to the moor to buy some lime and got to work mixing. it's a bit like making a cake; add earth, straw, lime; mix well in a large wheel barrow; apply to crack ; leave to dry for 2 weeks!
the results are pretty great and the stuff was hard as a rock after a few days - it's good to see the back of the cracks.
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