have been granted for a block work outer skin. We have since been advised by a couple of different specialist heating experts that block work as an outer skin for a timber frame is a waste of money and the outer walls can be rendered directly onto a mesh over the timber frame. We are mindful of the cost saving and would be pleased for your advice as to this option. It is also suggested that a different type of render should be used over mesh – can you recommend a suitable type. Our builder has previously experienced “crazing” of render when applied over a mesh.