How is everyone securing this to their rv windows? we don’t want to use spray adhesive as suggested by a few reviews. thanks.

We used industrial strength Velcro. Lined the edges and bottom of each window just outside the window frame and cut the insulation to match. The industrial strength Velcro adhesive has continued to hold up even with 100+ degree days. This way we can remove it when we want. And it doesn’t look bad - nice and tidy over the windows.

What is the R Value of the 5mm?

In the description... R-value up to 15.67 ( with one layer), up to 21.10 ( with two layers).

Has anyone used this over crawl space vents to keep it warmer during winter?

It would work well, cut 3/8" larger than both dimensions and press fit. I should caution you, unless you are having a problem with freezing pipes, you should never close the vents in the winter, moisture will collect on the underside of the house above the insulation causing mold. Air movement in the un-conditioned space under your house is critical.

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INSULATION MARKETPLACE SmartSHIELD -5mm 24''X50ft Reflective Roll, Foam Core Radiant Barrier, Thermal Foil - Engineered Foil

Product ID: 330666843

Details

Material
Aluminum
Brand
INSULATION
Coverage
[Broad]
Item thickness
5 Millimeters
Recommended uses for product
Insulation in

🔥Reflects 95% radiant energy

✂️Tear-proof yet easy to cut

🛡️Class A fire rating

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Description

🛡️ SmartSHIELD: Reflect your energy costs, not your worries!

ECO SMART INVESTMENT - Non-toxic, allergy-free insulation that pays for itself by reducing heating and cooling costs.
MOISTURE VAPOR SHIELD - Built-in vapor barrier prevents condensation and resists humidity effortlessly.
DURABLE YET USER FRIENDLY - Industrial-grade tear and puncture resistance combined with easy utility scissors cutting.
TOP TIER SAFETY CERTIFIED - Meets ASTM C1313 standards with a Class A fire rating for peace of mind.
ULTIMATE ENERGY REFLECTOR - Reflects up to 95% of radiant heat, slashing your energy bills year-round.

SmartSHIELD -5mm Reflective Roll is a high-performance foam core radiant barrier that reflects 95% of radiant heat, offers an R-value up to 21.10 with double layers, and meets rigorous ASTM C1313 fire and corrosion standards. Designed for industrial and commercial use, it combines durability with easy installation, moisture resistance, and non-toxic materials to optimize energy efficiency and safety.

Specifications

Product dimensions	15.24L x 0.61W Meters
Manufacturer	INSULATION MARKETPLACE
UPC	686091709390
Part number	SmartSHIELD -5
Item Weight	1.41 Kilograms
Item model number	SmartSHIELD -5
Size	24"x50ft
Item Package Quantity	1
Batteries Included?	No
Batteries Required?	No

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