Dynamat Dynaliner 32" x 54" 1/8" Self-Adhesive Sound Deadener — Lightweight Thermal & Moisture-Resistant

Dynamat Dynaliner is a 32" x 54" x 1/8" self-adhesive closed-cell rubber sheet that reduces noise and blocks heat—12 square feet per sheet, made in the USA.

If you want a lightweight thermal barrier and sound-damping layer for automotive floors, roofs, trunks or fiberglass enclosures, Dynaliner offers an easy-to-install, non-water-absorbing solution. Unlike traditional carpet pad or fibrous insulators that trap moisture, this closed-cell rubber sheet resists mildew and rust under carpets or panels while adding acoustic and thermal performance. It's commonly paired with heavier mass-loaded products for a complete noise-control system, or used on its own where light weight and moisture resistance matter.

How does Dynaliner reduce cabin heat and vibration?

Dynaliner provides nearly double the thermal resistance of many common lightweight automotive insulators, slowing heat transfer from engine bays or sun-exposed roofs. Its closed-cell rubber structure also helps damp mid- and high-frequency vibrations, improving perceived quietness without large weight gain.

• Closed-cell rubber construction blocks moisture and air movement.
• Thin 1/8" profile fits under carpet and panels without trimming clearance.
• Self-adhesive backing ensures full contact and easy placement.
• Won't absorb water, preventing corrosion beneath flooring.

Can I install Dynaliner myself, and where should I use it?

Yes — Dynaliner is DIY-friendly: peel the release liner, press the sheet in place, and trim as needed. Use it over Dynamat Xtreme on floors for combined mass and thermal control, on roofs to reduce solar heat gain, underhood for thermal shielding, or inside fiberglass speaker enclosures to protect components and improve acoustics.

• Comes as one 54" x 32" sheet that covers 12 square feet.
• Trim with a utility knife and apply firm pressure to secure adhesion.
• Compatible with carpets, panels and many aftermarket sound products.
• Available in thicker 1/4" and 1/2" options when more insulation is needed.

Will Dynaliner cause rust or mildew under my carpet?

No — the closed-cell rubber material does not retain water, so it will not hold moisture against the vehicle floor like spongey padding or fibrous insulators can. That makes Dynaliner a better choice for long-term installations where preventing corrosion and odor is important.

• Does not absorb or retain water, limiting mildew risk.
• Self-adhesive backing keeps the sheet flush to the surface to avoid trapped pockets.
• Durable composition resists breakdown from typical automotive environments.

How does Dynaliner fit into a full soundproofing strategy?

Dynaliner is best used as a thermal and vibration control layer in conjunction with heavier sound-deadening materials for low-frequency reduction. Many installers place Dynaliner over Dynamat Xtreme on floors to combine mass damping with thermal insulation or use it alone where weight and moisture resistance take priority.

• Use under carpets and flooring to reduce heat and surface vibration.
• Pair with mass-loaded or foil-backed deadeners for bass control.
• Apply to trunks and enclosures to tighten acoustic response of speakers.
• Suitable for both professional builds and DIY restorations.

Who this is for: Dynaliner is aimed at car enthusiasts, custom builders, audio installers and DIYers who need a lightweight, moisture-resistant thermal insulator that also reduces vibration and mid/high-frequency noise. If you want a product made in the USA that installs quickly, avoids trapped moisture, and pairs well with heavier deadening mats, Dynaliner is a practical choice for floors, roofs, underhood areas and fiberglass enclosures.