We live in a victorian end of terrace, which has solid walls We are looking to insulate these walls without having to cause much disruption.
My idea is that their is still a cavity between the soild external wall and the plaster and lath approximately 50mm to 60mm in depth which could be filled, just like cavity wall insulation.
I am just finding it hard to find a product that i could use to inject or blow into this cavity, which is breathable but water resistant. I have found a product known as Froth Pak which is a closed cell slow rise foam which can be injected into the cavity but this is expensive.
Anyone with any ideas would be greatly recieved.