Search  for anything...
Design Engineering

Design Engineering Floor & Tunnel Shield II 21" x 24" Adhesive Heat and Sound Insulation (3.5 sq. ft.)

  • Based on 0 reviews
Condition: New
Checking for the best price...
$47.16 Why this price?

Buy Now, Pay Later

As low as $7.86 / mo
  • – 6-month term
  • – No impact on credit to apply
  • – Instant approval decision
  • – Secure and straightforward checkout

Ready to go? Add this product to your cart and select a plan during checkout.

Payment plans are offered through our trusted finance partners Klarna, Affirm, Afterpay, Apple Pay, and PayTomorrow. No-credit-needed leasing options through Acima may also be available at checkout.

Learn more about financing & leasing here.

Selected Option

Free shipping on this product

FREE 30-day refund/replacement

To qualify for a full refund, items must be returned in their original, unused condition. If an item is returned in a used, damaged, or materially different state, you may be granted a partial refund.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

Availability: In Stock.
Fulfilled by Amazon
Arrives Saturday, Jun 20
Order within 17 hours and 32 minutes
Available payment plans shown during checkout
Protection Plan Protect Your Purchase
Checking for protection plans...

Recently Viewed

Size: 21" x 24" (3.5 sq ft)


Style: Adhesive


Features

  • Design Engineering Floor & Tunnel Shield is a premium adhesive-backed insulation designed to reduce heat transfer and dampen noise in vehicle floors and tunnels, improving overall cabin comfort and protecting interior components from heat damage.
  • Constructed with a durable aluminum outer layer bonded to a dense sound-deadening core, this shield effectively blocks radiant heat and reduces vibrations from road and engine noise for a quieter driving experience.
  • The strong adhesive backing ensures easy, secure installation on metal, plastic, fiberglass, and various other surfaces, conforming well to contours, bends, and tight spaces without cracking or peeling.
  • Ideal for automotive restoration, racing, or everyday use, this insulation enhances thermal management by lowering cabin temperatures and reducing driver fatigue caused by heat and noise intrusion.
  • Available in multiple sizes, the Floor & Tunnel Shield offers a cost-effective solution for targeted heat and sound insulation, providing professional-grade performance and durability for all vehicle types.

Description

Designed to provide the best possible heat protection in areas where high temperatures are always present and problematic, the DEI Floor & Tunnel Shield II limits heat transfer on fire walls, transmission tunnels, floor boards, fuel cells and other areas where heat is an issue. It provides excellent lightweight thermal protection, acts as a guard against track and road debris, and provides sound deadening as well. Constructed with an embossed 10 mil aluminum face bonded to 1/8" composite glass-fiber core and backed with a high temp super strong pressure sensitive backing, Floor & Tunnel Shield II withstands up to 1750 degrees Fahrenheit of direct continuous heat. The adhesive side holds past 450 degrees Fahrenheit. Its improved multifaceted modern aluminum surface offers improved reflectivity and rigidity and allows for ease of installation. At only 3/16" thick, this product can be shaped and trimmed for a custom fit and is ideal for minimal clearance areas. With a unique and patented finely woven glass-fiber backing, Floor & Tunnel Shield II is the easiest, most cost effective way to control thermal transfer while protecting expensive components and vehicle occupants from extreme heat situations and sound. Floor & Tunnel Shield II can be used on any number of surfaces including, metal, aluminum, carbon fiber, plastic, and more. Multiple uses include: fire walls, under hoods, transmission tunnels, floor pans, fuel cells, and exterior under vehicle locations - anywhere to reflect damaging heat.

Material: Aluminum


Brand: Design Engineering


Item Thickness: 0.18 Inches


Recommended Uses For Product: auto racing


Product Dimensions: 24"L x 6"W


Brand Name: Design Engineering


Global Trade Identification Number: 19


Manufacturer: Design Engineering


UPC: 607078505019


Manufacturer Warranty Description: Manufacturer Warranty


Part Interchange Info: 050501


Manufacturer Part Number: 50501


Model Number: 50501


Included Components: Design Engineering 50501


Unit Count: 3.5 Square Feet


Item Type Name: VEHICLE_MAT


Item Weight: 0.97 Kilograms


Item Thickness: 0.18 Inches


Item Dimensions L x W: 24"L x 6"W


Coverage: 3.5 square_feet


Material Type: Aluminum


Recommended Uses For Product: auto racing


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Saturday, Jun 20

Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

  • Klarna Financing
  • Affirm Pay in 4
  • Affirm Financing
  • Afterpay Financing
  • PayTomorrow Financing
  • Financing through Apple Pay
Leasing options through Acima may also be available during checkout.

Learn more about financing & leasing here.

Similar Products

Top Amazon Reviews

    • Excellent heat barrier and VERY GOOD ADHESIVE.
Size: 10" x 10" (0.83 sq ft) Style: Adhesive
Excellent heat shields. Use them in the engine compartment of my rv. They REALLY stick once they are pressed on. Well made and VERY good adhesive. Good luck if you want to want to remove it.
Reviewed in the United States on December 2, 2025 by Bart C. - Phoenix, AZ
    • Worth the money if you need the protection
Size: 21" x 48" (7 sq ft) Style: Adhesive
This practically holds itself in place. seems to work great.
Reviewed in the United States on March 17, 2026 by Nick
    • Good initial quality Good initial quality
Size: 21" x 24" (3.5 sq ft) Style: Adhesive
Review Image by Zane A. Undercoffer
I will re-edit this when I've put some heat to it and seen the miles it holds up to. As far as the product itself though, initial impressions are very good. I had the engine and transmission out of my miata so I could hopefully do this job the right way. There is a video out there of a gentleman putting one of these in with it installed and I can't imagine it would hold up as well. Reasons are numerous but I think the most important being there's no way you could get the tunnel clean enough for proper adhesion. Yes this product is extremely sticky, but like anything adhesive once you clog that surface up with contaminants it's going to lift off the surface and not provide the kind of bond intended. If you've come here, your car is too hot due to tunnel heat most likely. Though I suppose this product would work for lots of places. The aluminum side of this shield resembles the sort of thing I've seen on lots of new oem shields. It's got a cratered surface, it's somewhat reflective in nature. It is fairly stiff as a result, though it bends fairly easily. My application is for a race car (miata) and I've always found the tunnel gets just too hot from exhaust especially during the summer months (I usually don't have carpet either). So hopefully this helps this season. I've attached an image that shows how mine went in. I made sure to thoroughly clean the surface before-hand and started with the driver's side. Working it down and peeling back the adhesive protection layer of the product I was able to get it to finally adhere the way I wanted. Note, I cut my product with tin snips at the folds of the body to help ensure I didn't have any bubbles in where it applied. I don't believe there is any real way to not do this at least on a miata's tunnel. We'll see how well it works but I'm real hopeful it solves or at least helps to mitigate the heat issue. Hoping cutting it the way I did doesn't somehow ruin it's overall effectiveness or make it less long-lived. Will update with how it holds up. [...] ... show more
Reviewed in the United States on April 18, 2014 Reviewed in the United States on April 18, 2014 by Zane A. Undercoffer
    • Worth the cost - super sticky adhesive and insulates well Worth the cost - super sticky adhesive and insulates well
Size: 21" x 24" (3.5 sq ft) Style: Adhesive
Review Image by Eric Lobdell
While it is a bit pricey, it is a "one and done" application. I have installed this (12x24 inch size) in two Mazda Miatas transmission tunnels. They are known to transmit a lot of heat into the footwell, particularly on the driver's side (for left-hand drive cars). With the extremely sticky adhesive, as long as the tunnel is properly clean, it will be a permanent attachment. A little trimming was done to help it fit where I wanted it. Heat transmission is significantly reduced. I cannot envision any way this could be successfully installed in a Miata with the transmission installed. Do it with your next clutch job! ... show more
Reviewed in the United States on September 17, 2025 Reviewed in the United States on September 17, 2025 by Eric Lobdell
    • Effective heat shield for motorcycle saddlebags
Size: 21" x 24" (3.5 sq ft) Style: Adhesive
I am using this product to protect nylon motorcycle bags sitting in contact with an exposed motorcycle exhaust, so I needed something that could handle direct contact, not just reflected heat. This shield is meeting my needs. The adhesive backing of the shield seems to be adhering well to the neoprene pad on the bag. In testing, the exhaust becomes far too hot to touch, while the neoprene pad and the bag itself become only slightly warm, so I'm confident there will be no meltdown during my upcoming road trip. The sturdy shield material can be cut to size with a heavy-duty pair of scissors, and is flexible enough to shape without distorting at freeway speeds. I would recommend taping the cut edges of the heat shield with aluminum exhaust tape for a little more finished look and keep water from getting into the insulation. ... show more
Reviewed in the United States on April 8, 2013 by Steve Wainwright
    • Buy the adhesive backing kind and save yourself the hell that is working with lose fiberglass! Buy the adhesive backing kind and save yourself the hell that is working with lose fiberglass!
Size: 42" x 48" (14 sq ft) Style: Adhesive
Review Image by Stephanie
Review Image by Stephanie
Exceptional product. I chose the 2x the cost version with the adhesive already applied and I HIGHLY recommend you do the same. I used 4 different DEI products on the heat/sound insulation modification project on my 2019 Thor Freedom Elite. Thing was loud & hot. I did the entire floor in this product. Wish I had also used it for the dog house. Moldable (to a point) but still quite thick and stiff at 10 mil aluminum facing. Worked exceptionally well for cooling down the cab. ... show more
Reviewed in the United States on July 19, 2025 Reviewed in the United States on July 19, 2025 by Stephanie
    • It's great at doing its job.
Size: 10" x 10" (0.83 sq ft) Style: Adhesive
It's great at doing its job: it's a good insulator and heat reflector. The adhesive is very aggressive, which is great.
Reviewed in the United States on June 3, 2025 by Pariah Zero
    • Excellent product. Takes patience to install if you want an excellent result. Excellent product. Takes patience to install if you want an excellent result.
Size: 21" x 48" (7 sq ft) Style: Adhesive
Review Image by Mx Guy
Review Image by Mx Guy
Review Image by Mx Guy
This is a very high quality product but there are things you need to know. First, it is not like working with that rubberized sound deadening material that goes under your carpet. This uses a much thicker aluminum foil over a fiberglass material with a very aggressive adhesive. To give the adhesive its best chance, I started by cleaning my 140k mile floor pan multiple times with mineral spirits, prepped it with scotch bright pads and sand paper, then and gave it a fresh rattle can paint job. I let the paint cure for a week before installing the tunnel shield. It took a 42x48 and 21x48 sheet to do the entire tunnel area from frame rail to frame rail of my '04 Miata. Once the adhesive makes anything more than the lightest contact, its difficult to remove without separating the fiberglass layer so get it right the first time. I created a template with paper bags and masking tape. then cut the template in such a way that it would lay flat. I then layed out the template pieces on the tunnel shield material to plan my cuts. I bought an inexpensive pair of scissors (ASIN B00LSWLAA8) and they made it through the job... I needed to stop periodically to clean the adhesive and fiberglass off them. The cut edges are sharp so wear some gloves! I roughly contoured the tunnel shield to my project BEFORE removing the paper backing. I then carefully positioned my work and gradually removed the paper backing while rolling it in. Work slowly and deliberately. The foil is flexible enough to roll into and around contours but it does have its limits. The roller I used: (ASIN B07X5SV5FD), its a good quality product that should last through many projects. You'll need to seal the edges since water could get into the fiberglass layer. DEI recommends their tape for this purpose but several people had negative things to say about the tape. On the recommendation of another enthusiast, I sealed the edges with RTV. I used loctite grey #5699 ASIN B0794BYCZ2. The pressurized container works in any orientation and made it easy to apply a consistent bead. Mask along your seams so you get straight, tidy edges. Again if you work slowly and deliberately, you can get good results. I worked in the silicone with a finger and wore heavy Venom Steel nitrile gloves to keep the chemicals off/out of my body (ASIN B00Y2OFGMW). Good Luck! ... show more
Reviewed in the United States on July 27, 2020 Reviewed in the United States on July 27, 2020 by Mx Guy

Can't find a product?

Find it on Amazon first, then paste the link below.
Checking for best price...