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Webthermafiber® ultrabatt™ mineral wool insulation is designed to provide excellent thermal insulation and fire resistance in residential and commercial construction. Webthermafiber® ultrabatttm mineral wool insulation is designed to provide excellent thermal insulation, fire resistance and noise control in residential and light commercial construction. Webthermafiber® ultrabatt™ mineral wool insulation is designed to provide excellent thermal insulation, fire resistance and noise control in residential and light commercial construction.