The front corner of my house collapsed taking with it most of the side wall. The wall was made of cob and was built in the 1780's, at some time the wall was rendered with a sand and cement render. We had removed the cement based render in preparation for lime render. I have tried to claim from my buildings insurance however they say that the collapse was due to deteriation caused by poor maintenance over a considerable time ie. the application of cement based render. Has anyone else had this problem? and if so have they found a way of persuading the insurance company to pay up? The insurance company is one of the largest insurers who regularly advertise on TV.