The best replacement for foil insulation is fiberglass insulation.

The best alternatives to foil insulation are rated as following:
★★★★★  fiberglass insulation

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Speaking about foil insulation, one probably shouldn't forget about foam.

Other search terms related to foil insulation and their ratings are:
★★★★★ foam
You have in mind a companion for foil insulation and it is not yet here? Propose!



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foil insulation
fiberglass insulation