There was a thread in a forum which I am trying to track down which mentioned a material that you could dampen and mould around the boiler or pipes I should have taken a note of it but as usual did not. I remember it saying builders merchants but went in and someone built like a ***** door said duh (just like homer) end of enquiry.
I do not remember LBSC ever mentioning lagging, In his strip of back garden I do not think that it was ever needed.
So can anyone remember what the material was !!!
Would help rob and self greatly
Have a good christmas and new year
Bob