Insulation for ideal model 55

I have pulled out all the old insulation surrounding my liner on my Ideal Model 55b. Now I need to know what is the best type of insulation to go back with. I have attached the copper lines to the liner in places and figured the insulation will help hold them against the liner to. I guess I need to know what type of insulation to use and do I need to pack it in tight.
                             Thanks,
                              Tommy Hall

[Kevin C]

Hello

Use unfaced wall insulation.

Kevin