I have always been suspicious of cavity wall insulating material inserted after construction. Particularly the plastic foam (?) injected material. It strikes me that after a period of time it will settle and compress under its own weight, dust will then settle on this in turn, and a bridge formed between the wet outer and the dry inner walls. This is important in the wet west of England.
I really don't see the point of it of it. After all air is a very good insulator - you rely on it for double glazing. After all its not the foam or glass wool that is the insulator but trapped air ( this is proved by the non-insulating properties of a soggy cotton padded jacket. )
As I see it what is required ( if at all ) are non-bridgeable baffle plates to stop the circulation of air in the cavity ( convection loses ) or alternately live with it by putting insulating material on the underside of the roof so that the loft becomes part of the insulated volume warmed by air coming up from the top of the cavity wall.
As a DIY project I would like to know how to remove existing 'insulating' material from a cavity wall?
I really don't see the point of it of it. After all air is a very good insulator - you rely on it for double glazing. After all its not the foam or glass wool that is the insulator but trapped air ( this is proved by the non-insulating properties of a soggy cotton padded jacket. )
As I see it what is required ( if at all ) are non-bridgeable baffle plates to stop the circulation of air in the cavity ( convection loses ) or alternately live with it by putting insulating material on the underside of the roof so that the loft becomes part of the insulated volume warmed by air coming up from the top of the cavity wall.
As a DIY project I would like to know how to remove existing 'insulating' material from a cavity wall?