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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SmartSHIELD -5mm 48''X50ft R17 Reflective Insulation Roll, Foam Core Radiant Barrier, Thermal Insulation - FOIL / FOIL

Product ID: 237147426

Details

Brand
INSULATION
Item Thickness
5 millimeters
Material
Aluminum (PE)
Product Dimensions
600"L x 48"W

🔥Reflects 95% radiant heat

✂️Easy to cut & install

🛡️Class A fire rating

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Description

🛡️ Stay cool, save cash, and shield your space like a pro!

EFFORTLESS INSTALLATION - Lightweight, flexible roll cuts easily with scissors—no mess, no hassle, no fiberglass fuss.
MAXIMIZE ENERGY SAVINGS - Reflects 95% of radiant heat to slash your heating & cooling bills.
MOISTURE MOLD RESISTANT - Vapor barrier technology prevents condensation and resists mold, keeping your space healthy.
VERSATILE COMMERCIAL GRADE - Perfect for attics, walls, metal buildings, and even wine cellars—professional-grade insulation for every project.
BUILT FOR SAFETY DURABILITY - Class A fire rating with tear & puncture resistant foam core for long-lasting protection.

SmartSHIELD -5mm Reflective Insulation Roll delivers R17 thermal resistance with a dual-sided 95% radiant heat reflection. Featuring a Class A fire rating and a proprietary corrosion-resistant coating, this industrial-grade foam core insulation is vapor barrier certified, tear-proof, and easy to cut. Ideal for commercial and residential applications, it reduces energy costs year-round while preventing moisture and mold buildup.

Specifications

ASIN	B08JS7TK93
Best Sellers Rank	#45,304 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #273 in Weather Stripping
Brand	INSULATION MARKETPLACE
Brand Name	INSULATION MARKETPLACE
Coverage	2500 square feet
Customer Reviews	4.7 out of 5 stars 1,017 Reviews
Item Dimensions L x W	600"L x 48"W
Item Thickness	5 millimeters
Manufacturer	Insulation Market Place LLC
Manufacturer Part Number	SmartSHIELD -5
Material	Aluminum, Polyethylene (PE)
Material Type	Aluminum, Polyethylene (PE)
Model Number	SmartSHIELD -5
Product Dimensions	600"L x 48"W
Recommended Uses For Product	Metal Building insulation, Steel building insulation, Pole Barn insulation, Attics, Ceilings, Walls, Steel Buildings, POLE BARNS, Roofing, Concrete Floor, Radiant Heat in a Concrete Floor, Radiant Heating, Water Heater Tank, Water Pipe and Air Duct, Crawl Space, In Ground Swimming Pools, Shed, Fish & Hunting Shelter, Cooling Room, Cold Chamber or Wine Cellar, Concrete Block Wall, Cavity Wall for Metallic Studs in Commercial Buildings, Foundation Wall, Quanset Hut, House Wrap. Recommended Uses For Product Metal Building insulation, Steel building insulation, Pole Barn insulation, Attics, Ceilings, Walls, Steel Buildings, POLE BARNS, Roofing, Concrete Floor, Radiant Heat in a Concrete Floor, Radiant Heating, Water Heater Tank, Water Pipe and Air Duct, Crawl Space, In Ground Swimming Pools, Shed, Fish & Hunting Shelter, Cooling Room, Cold Chamber or Wine Cellar, Concrete Block Wall, Cavity Wall for Metallic Studs in Commercial Buildings, Foundation Wall, Quanset Hut, House Wrap. See more
UPC	686091709383
Unit Count	1 Count

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€ 759.43

Duties & taxes included

In stock

Sold byAmazon PortugalDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Portugal.

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TrustScore 4.5 | 7,300+ reviews

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