wall insulation

[--tom]

is it still regulations practice to fully fill the cavity with insulation?

 

[parkz]

depends on insulation used
you can full fill cavities with rockwool
but if using kingspan or celotex you'd only part fill so you'd probably need a 100mm cavity with a 50mm insulation used
its summat to do with damp can travel across kingspan but with rockwool it travels downwards

 

[wickerman]

if rockwool gets wet it turns to muck

 

[Plot1]

is it still regulations practice to fully fill the cavity with insulation?

It has never been a requirement - however you may need to in order to meet the U-value requirements in the Building Regulations. Talk to your building control department.