My walls were insulated 30 years ago with UF foam insulation. I've the
certificate to prove it. However, they neglected to fill the tops of the
wall, probably about 18" short of the wall plate. This part is measurably
colder than the rest of the walls. 

I'm currently topping up the loft insulation, and could pour some forms of
insulation in over the wall plate. I've filled up one spot with the
polystyrene extrusions used to pack boxes. I'd like to put some more
insulation in before I complete the loft insulation. Any suggestions on what
to use that can be got in easily. PU foam would be much too expensive in
aerosols.


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