Hi guys. Im currently render dashing a pre 1920s house in s wales and we have hacked off and found the walls to be a rat trap cavity that is pretty loose.whilst ive heard of these walls before ive never worked on one. Its very loose in places and seems a little unstable. .im very reluctant to just render over and dash. I was thinking of meshing first to stabilise a little. ..mmmmm. just want some advice guys if you've worked on this type of work before. Cheers lads. Stevo...ps no boomtown rat joke's. .ta.