So has anyone tried sewing LDPE (Low Density Polyethylene)
packing foam, or polyfoam underlay for flooring?
Roberts Unison 2 in 1 underlayment is sold at Home Depot in a 48 inch wide x 300 " roll for $24. This foam is 3/32 (2.38 mm) thick. If several layers are sandwiched with an air gap between them (say in an underquilt) the R value would be much higher. A 2 cm thick layer would give an R value of at least 2.3.
LDPE foam layers are thin and flexible and could likely be used much like IX.
Sound Barrier Plus is a 1/16 foam flooring underlay that gives a much higher R value of 1.6 for this thin layer, which looks promising. If this is accurate a 6mm layer could be R 6!
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