foil insulation tape

Listed thicknesses include foil and total mil values such as 3.9 mil, 5.9 mil, combinations like 1.7 mil (foil) plus 1.7 mil backing, 3.6 mil, and a 0.2‑inch thickness for foam pipe wrap.

Common roll widths range from about 1.89–2 inches up to roughly 3.9 inches. Typical roll lengths in listings run from about 66 feet up to 210 feet, with examples including 150 ft (50 yards) and other 150 ft listings.

Typical uses include sealing and patching HVAC duct joints and seams, wrapping and insulating pipes, repairing dryer vents and exhausts, heat shielding in automotive or engine areas, sheet‑metal repair, and general sealing or waterproofing tasks.

Some tapes are fiberglass‑reinforced aluminum foil; others use a foam or rubber core with an aluminum foil reflective layer. Listings also note multi‑layer foil plus backing constructions for added strength.

Many listings describe products as suitable for both indoor and outdoor use, noting weather resistance, UV resistance, and moisture resistance that support outdoor applications as well as indoor HVAC and pipe insulation tasks.