We have a ground floor flat (or maisonette, as the Estate Agent
  called it) in a 1960 building that contains 4 flats - 2 upstairs
  and 2 on the ground floor.  We'd like to get cavity wall
  insulation, but haven't had anyone round yet.
  
  There's a slim chance the flat above ours would go for it if we
  were having it done, but there's no chance the other ground floor
  flat would; if upstairs don't do it at the same time as us, we
  wouldn't want to do anything that stopped them doing it in the
  future.
  
  Is this going to be possible, or will the firms just laugh at us
  because of our uncooperative neighbour?
-- 
                                                         Selah

On Thu, 15 Sep 2005 12:42:38 +0000 (UTC), Stephen Gower
 wrote:

|   We have a ground floor flat (or maisonette, as the Estate Agent
|   called it) in a 1960 building that contains 4 flats - 2 upstairs
|   and 2 on the ground floor.  We'd like to get cavity wall
|   insulation, but haven't had anyone round yet.
|   
|   There's a slim chance the flat above ours would go for it if we
|   were having it done, but there's no chance the other ground floor
|   flat would; if upstairs don't do it at the same time as us, we
|   wouldn't want to do anything that stopped them doing it in the
|   future.
|   
|   Is this going to be possible, or will the firms just laugh at us
|   because of our uncooperative neighbour?

When our house cavities were filled with *foam* they drilled a matrix of
holes, IIRC 2 ft centers, because the foam only moved short distance.  So
the stuff would stay *roughly* in your walls.   If the upstairs people
filled with foam, or rock wool later, your insulation would not affect
theirs.

-- 
Dave Fawthrop <dave hyphenologist co uk> 
"Intelligent Design?" my knees say *not*.
"Intelligent Design?" my back says *not*.