looks like fiberglass may be the best, but how will the foam filled doubled sided do? looks like its about 1/4 thick and a r value of 8
AES R-8 HVAC Duct Wrap Insulation Reflective 2 Sided Foam Core 4' x 50' (200 Sq Ft)
wonder if that is realy a r-8
thank you for your time
richard

does this realy work as a r 8 ?? its only a 1/4 ythick AES R-8 HVAC Duct Wrap Insulation Reflective 2 Sided Foam Core 4' x 50' (200 Sq Ft)