Quiet Down Underlay Max

Green Qualities

• 90% recycled content - 49% Post Consumer Recycled Content
• Recycled rubber products require less energy to produce than virgin rubber products
• Diverts used tires from landfills
• Extremely long usable lifecycle

Certifications/Performance Rating

• Masticated Rubber is Waterproof- no need for vapor barrier when taped properly
• High Bond greatly reduces costs of glue/mortar needed
• Stronger than underlayment made of crumb rubber
• High Bond(HB) version available for tile and Glue/Mortar Installations
LEED Contribution Letter
Product Information
Features and Benefits
Preparation and Installation Instructions
Typical Floor Assemblies
Frequently Asked Questions
ST-52, IIC 47 Acoustical Performance
Product Cut Sheet


Proven and trusted by professionals and homeowners alike, QuietDown Max is the original underlay offering maximum sound insulation for floating floors and nail-down applications. Doubles as a durable 100% vapour barrier.

Symar® QuietDown® is a multi-purpose, high-performance acoustic underlay engineered from recycled rubber to reduce sound transmission through subfloors. Specially formulated for your flooring type available for a wide variety of flooring types such as ceramic tile/stone, engineered wood, hardwood, laminate, carpet and vinyl, QuietDown offers incredible sound-dampening qualities. Easy-to-install 4’ x 3½’ panels are Where to use QuietDown QuietDown is perfect for condos, kitchens, playrooms, institutional settings, and anywhere else where noise transmission is a concern. QuietDown is available in 1/12”, 1/8”, 1/4”, and 3/8” thicknesses to help achieve the sound transmission reduction needed for your project. thinner, lighter, and stronger than conventional underlays.


Product Thickness Size Weight per Sheet
F03324 3.2mm (5/32") 42" x 48" 10.70 lbs. 
F03650 6mm (1/4") 42" x 48" 21.40 lbs.
-------- 3/8" 42" x 48" --------

Proven results:

Tests by the National Research Council show that QuietDown is effective at reducing mid- to high-frequency impact sounds beneath ceramic flooring, hardwood and laminates. For example, 1/8” QuietDown under hardwood achieves an FIIC rating of 61. This means impact sounds such as speech, people walking in hard-soled shoes or dropped toys, pots, pans, etc. will be reduced. Installs in a flash QuietDown is perfect for do-it-yourselfers. Laying and trimming QuietDown is quick and easy.


Installation techniques vary depending on your flooring type, read the installation instructions for more info. Green materials Like all Symar products, QuietDown is engineered from recycled rubber – so every square foot you install means less landfill waste. For contractors, this means it contributes to the ‘green content’ in new construction.

Keeps working for years and years QuietDown is made of masticated rubber that is fiber-reinforced and fully cured. This unique process translates into a stronger, more resilient acoustic underlay. Symar QuietDown doesn’t pack down or fall apart over time – it keeps on performing year after year.

Investing in new flooring? Installing QuietDown below your floor is far more durable and effective as a sound dampener than foam or fibrous underlay. The difference is remarkable.

Features and Benefits:

High Performance mid to high frequency impact sound reduction Acoustic Underlay achieving a FIIC 61* under wood floor systems.
• Doubles as a crack isolation membrane under ceramic and stone installations.

• Unlike foams and other rubber underlays, QD High Bond offers
• QD products contribute to LEED credits.
• Easy to handle sheets versus rolls make for less waste and lay down flat with no curled edges.
• QD sounds good, providing a nice solid feel to the floor.
• superior bonding and anchoring of adhesives and mortars in glue down wood and stone/tile assemblies.
• QD is an extremely durable 100% vapour barrier, is mildew and insect repellent and will not rot or fall apart over time.
• QD has low surface deflection and will not sag or compress like foams and felt fibre underlays.
• QD meets ASTM C627-93 Robinson Test designation for medium to heavy commercial applications in tile and stone assemblies.
•QD’s high coefficient of friction reduces creeping and movement of floating wood systems.
• QD's natural physical properties offer excellent thermal R values and reduce passive thermal loss.
• QD is a green product, is engineered and manufactured from recycled tires thereby diverting waste from our landfills.
• Based on 8" concrete slab and 1/8” QuietDown with no suspended ceiling.


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