Best Cavity Wall Insulation Material to Minimise Heat Loss

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going to get the house done on the grant system.

have identified the common materials as:

1) Polystyrene bonded beads
2) Glass wool (yellow or white)
3) Rockwool (grey/brown)

the thermal conductivity for them all is in the region of 0.04 W/mk.

the installation tolerance ranges are (in same order), stated as "target mean density for the product in kg/m3 with a density variation of ± kg/m3"

1) 12 kg/m3 +/- 2 (17%)
2) 18 kg/m +/- 5 (28%)
3) 40 kg/m3 +/- 10 (25%)

the question is which gives the minimum heat loss for the same wall detail or are the differences in density and installed density variation of no significance given that all have pretty much the same conductivity.
 
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