Frost King R338H Self-Stick Foam Weatherseal for Child- and Pet-Safe Homes, No Tools Required for Installation
Frost King R338H Self-Stick Foam Weatherseal for Child- and Pet-Safe Homes, No Tools Required for Installation
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Why you'll love it
- Self-stick backing requires no tools, glue, or professional installation
- Wide range of sizes (11 variants from 3/16" to 9/16" thickness) ensures a fit for nearly any gap
- Rubber foam construction delivers both sealing compression and shock absorption in one product
- Multi-surface versatility works on home, auto, and marine applications from a single roll
- Made in USA manufacturing and limited lifetime warranty signal trusted, long-term quality
- Stretches slightly when laid in place to reach the actual advertised length
- Foam compresses nicely but is thick enough to not be crushed
- Adhesive remains strong even after 4+ years on previously purchased rolls
- Blocks drafts effectively even after a month of regular door opening/closing
- Easy to separate from backing paper
- Significantly dampens outside sound on casement windows
Perfect for
- Seal gaps around windows and exterior doors to block drafts and reduce energy bills
- Weatherstrip vehicle doors and trunks to cut down on road noise and rattles
- Weatherproof boat cabins and hatches against water intrusion in marine environments
- Cushion and stabilize appliances, electronics, or cabinet doors to prevent vibration
- Block dust, insects, and cold air from entering through small structural gaps
- Shimming a permanent A/C home filter that is slightly smaller than needed
- Replacing compromised weatherstrip on a 2005-2007 Mustang to fix water leaking onto floorboard
- Sealing lids on ATV/four-wheeler boxes to keep out moisture and dirt
- Preventing wind noise and air leaks around car windows
- Adding a cushion/protective strip that is sticky enough not to move
- Preventing rattling/noise on a window fan by taping where it contacts the window frame
- Sealing plexi panels over old windows without messy caulking
About us
From your basement to your roof, from the front door to the back, Frost King products are there to save you money and save you energy. Frost King, simply the trusted name in home insulation. It all began nearly a century ago when Frost King introduced the nation’s first do-it-yourself weatherstripping kit. That simple kit, just 17 feet of felt carpet strips and some nails, managed to single handedly ignite America’s “Do-It-Yourself” revolution. Since that time, Frost King has expanded to help you save money and energy in just about every corner of your home. During the winter, Frost King products will keep the cold air out, insulate your pipes and protect your rooftops from freezing snow. In the summer, Frost King keeps gutters clean, protects your home from leaks, and cuts air conditioning costs.
Frost King R338H Self-Stick Rubber Foam Weatherseal, 3/8"W, 3/16"T, Black|Blacks
A tough, durable self-stick tape with minimal compression. Use the Rubber Foam Weatherseal as a weatherstrip, or as a gasket or to cushion and stabilize major appliances. Plus, on cars, trucks and boats, it can help prevent rattles, vibrations and squeaks.
Product Information
The product is 3/8x3/16 BLK Foam Tape Easy and simple use kit The product is manufactured in United States Minimum Compression Superior Shock Absorbing Minimum Compression Superior Shock Absorbing Extra tough and durable Seals around windows and doors Many automotive and marine uses Show more
Brand Frost King Material Rubber Color black|Blacks Product Dimensions 120"L x 0.38"W Item Thickness 0.25 Inches Recommended Uses For Product weatherstripping, sealing gaps in vehicles, cushioning and stabilizing appliances UPC 077578012209 Number of Items 1 Manufacturer Frost King Unit Count 10.0 Feet Part Number R338H Item Weight 0.6 ounces Item model number R338H Is Discontinued By Manufacturer No Size 3/8"W, 3/16"T Style 3/8"W, 3/16"T Item Package Quantity 1 Included Components No Batteries Included? No Batteries Required? No Warranty Description Limited Lifetime Warranty
Frequently Asked Questions
Is the self-stick installation safe to do around my kids without tools or chemicals?
Yes, the peel-and-stick installation requires no sharp tools, no caulk, no solvents, and no chemical adhesives, making it a family-friendly project that kids can even help with under supervision.
Does the foam eliminate the need for caulk that might off-gas harmful fumes?
Yes, the rubber foam weatherseal is designed as a clean alternative to caulk, and is commonly used to seal plexi panels over old windows without the mess and chemical exposure of caulking.
Will the adhesive fail and leave my toddler exposed to a drafty door?
Customers report the adhesive remains strong even after four or more years of use, so you can trust it to maintain a continuous seal that keeps cold air, dust, and insects out of your child's room.
Is the foam material safe if my pet chews on a piece that falls off?
The closed-cell rubber foam is non-toxic and is generally considered pet-safe, though you should discourage chewing and contact the manufacturer if a large piece is ingested.
Can I install this safely in my child's bedroom without ventilation concerns?
Yes, the foam does not require chemical adhesives or solvents, and the low-odor material means you can install it in a closed bedroom without worrying about fumes or air quality.
I'm a renter worried about fire codes — is this foam safe to leave installed year-round?
Yes, the closed-cell rubber foam is a passive sealing product that does not introduce any heat source or fire risk, making it safe for long-term installation in rental units.
Does this foam block insects and allergens that could harm my child?
Yes, by sealing gaps around windows, doors, and AC units, the foam creates a barrier against dust, insects, and outdoor allergens from entering your home, supporting a healthier indoor environment for children and pets.
Is the rubber foam fire-resistant enough to use near a furnace room or water heater closet?
Closed-cell rubber foam is commonly used in utility areas and holds up to typical indoor temperatures, but check local building codes for any specific fire-rating requirements in utility spaces.
Is this safer than open-flame candles for keeping my drafty room cozy?
While the products serve different purposes, this foam eliminates the drafts that might tempt someone to light candles for warmth, removing the open-flame risk entirely from your home.
How does rubber foam compare to spray foam insulation for safety around kids?
Spray foam requires chemical handling, protective equipment, and professional installation, while this self-stick rubber foam applies cleanly with bare hands and no chemical exposure, making it the safer DIY choice for households with children.
Rubber foam vs. weatherstripping with metal fasteners — which is safer for a household with toddlers?
Rubber foam has no metal fasteners, staples, or sharp edges that could cut curious hands, making it a much safer choice than nail-on or staple-in weatherstripping in homes with young children.
Will the adhesive lose strength over time and leave gaps that compromise my child's safety?
No, the long-lasting adhesive maintains its bond for years, so the seal remains intact and continues to block drafts, insects, and outside air that could affect your child's comfort and health.
Is the foam safe to use around my older parent's mobility equipment and grab bars?
Yes, the foam can be applied to door frames and thresholds to reduce drafts that might cause cold-floor hazards for older adults, without introducing any tripping or chemical risks.
Will the foam compress and create a gap that lets in carbon monoxide from an attached garage?
Properly installed foam maintains a tight seal, but carbon monoxide protection requires a dedicated CO detector — use this foam for comfort and energy savings, and a UL-listed CO alarm for safety.
Is the foam safe to leave on a door that opens to a fire escape in an apartment?
Yes, the foam does not impede door operation or locking mechanisms, so it will not block access to or from a fire escape, but verify that any fire-rated door requirements are met by your building code.
Does this product have a warranty that protects my family if it fails?
Yes, Frost King backs this product with a limited lifetime warranty, giving you long-term assurance that the foam will continue to perform safely and reliably for years to come.
How do I install the Frost King R338H self-stick foam weatherseal?
Clean the surface where the foam will be applied, making sure it is dry and free of dust or grease. Cut the foam to the desired length with scissors, peel off the release liner, and press the adhesive side firmly into place along the gap. Hold for a few seconds to ensure a strong bond.
Can I cut the foam to size without fraying or losing the seal?
Yes, the closed-cell rubber foam cuts cleanly with scissors or a sharp utility knife, and the adhesive backing remains intact along the cut edge, so you can create custom lengths for any window, door, or compartment.
How long does the adhesive take to fully bond?
The pressure-sensitive adhesive grips immediately on contact, with full bond strength typically developing within 24 hours as it cures against the surface.
Will this foam stick to painted wood, metal, vinyl, and plastic surfaces?
Yes, the adhesive is engineered to bond to a wide range of surfaces including painted wood, aluminum, vinyl, plastic, fiberglass, and glass, making it suitable for home, automotive, and marine applications.
Is this product compatible with my 2005-2007 Mustang door seals?
Yes, customers specifically use this foam to replace compromised weatherstrip on 2005-2007 Mustangs to fix water leaking onto the floorboard, and it also works on many other vehicle door panels, trunk lids, and window frames.
What comes in the box when I order this product?
You receive one 10-foot roll of self-stick rubber foam weatherseal in a 3/8" width and 3/16" thickness, in black, with a release liner protecting the adhesive backing — no additional tools or accessories are required for installation.
Is rubber foam weatherstripping safe to use in homes with allergies or asthma?
Yes, the closed-cell rubber foam does not shed fibers like felt, does not absorb moisture that can harbor mold, and helps seal out dust, pollen, and outdoor allergens, making it a good choice for allergy and asthma sufferers.
Will the foam degrade or lose its seal if exposed to direct sunlight for years?
The closed-cell rubber foam is engineered with UV resistance to maintain its structure and sealing performance under prolonged sun exposure, making it suitable for both indoor and outdoor applications.
What is the difference between rubber foam weatherseal and silicone weatherstripping?
Rubber foam compresses easily to fill variable gaps, absorbs vibration, and is more affordable, while silicone weatherstripping offers higher temperature tolerance and longer UV life but costs more and is less forgiving on uneven surfaces.
