Dynamat Dynaliner 32" x 54" 1/4" Sound Deadener & Thermal Insulator — Self-Adhesive 12 sq ft Sheet, Black

Dynamat Dynaliner is a 12-sq-ft, 1/4" thick, self-adhesive closed-cell rubber pad that reduces road noise and blocks heat when applied under carpets, on roofs, floors, trunks and fiberglass enclosures.

Built for cars, trucks and custom audio or enclosure projects, the Dynaliner sheet combines lightweight thermal resistance with a durable adhesive backing so it stays put without trapping moisture. Made in the USA, this 54" x 32" sheet sits atop Dynamat Xtreme or other damping layers to improve cabin comfort, protect delicate surfaces from heat, and add an insulating layer that won’t promote rust or mildew.

How does Dynaliner reduce cabin heat and protect components?

Dynaliner’s closed-cell rubber structure reflects and slows the transfer of heat through vehicle panels and fiberglass. Its nearly doubled thermal resistance compared with typical low-density insulators keeps engine bay, trunk and roof heat from reaching the cabin or audio components.

• 1/4" thickness provides a solid thermal barrier without heavy bulk
• Closed-cell material sheds water, preventing moisture buildup
• Use over Dynamat Xtreme or bare metal for stacked thermal performance

Will this sheet help cut road noise and improve sound quality?

While Dynaliner is primarily a thermal insulator, its dense closed-cell rubber also dampens airborne and impact noise when applied under carpet or inside enclosures. It reduces vibrations that interfere with speaker output, helping audio systems sound cleaner and more defined.

• Applies under carpet, on interior panels, and inside speaker boxes
• Minimizes resonance that muddies mids and highs in car audio
• Pairs with vibration dampers for a full acoustical upgrade

How easy is Dynaliner to install and will it stay in place?

The sheet features a strong self-adhesive backing that bonds to metal, fiberglass and many plastics, allowing one-piece coverage over floors and large panels. Cut with a utility knife to fit irregular shapes; the material is flexible enough to conform to contours but rigid enough to resist compression under carpet.

• One 54" x 32" sheet covers 12 square feet for large areas
• Adhesive backing sticks firmly without glue or fasteners
• Trim with scissors or a knife for tight fit around fixtures

What thickness options are available and why choose 1/4"?

Dynaliner comes in 1/8", 1/4" and 1/2"; each thickness balances space, insulation and pliability. The 1/4" sheet offers a middle ground—substantial thermal resistance and noise reduction without the bulk or weight of 1/2"—making it ideal for under-carpet use and many enclosure applications.

• 1/8": best where space is limited but some insulation is needed
• 1/4": strong thermal and acoustic performance with manageable thickness
• 1/2": maximum insulation where space allows

Who is this for? If you’re a car enthusiast, custom builder, sound installer or DIYer looking to lower cabin temperatures, reduce unwanted noise, and protect electronics or enclosures, Dynaliner is built for your projects. It’s especially useful when you want a moisture-resistant insulator that complements existing Dynamat damping products or serves as a standalone thermal layer under carpet, in trunks, on roofs, and inside fiberglass speaker boxes.