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HushFrame Raft

$4.50
per piece
Lead Time: 1-3 DAYS
  • High performance drywall decoupler for walls and ceilings
  • Use with wood furring or metal furring hat channel with 1/4" to 1" of space lost (plus drywall)
  • Exceptional STC and IIC test results, including multiple UL assembly ratings for fire safety
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The HushFrame Raft Connector is the newest invention for decoupling drywall from wall and ceiling structures. Decoupling is not a new concept in sound isolation, but the Raft provides unique benefits over competing products. This wood based product is connected between a soft, yet extremely strong, rubber silicone. The energy from sound is lost in the transfer from the front of the Raft to the base of the Raft via the rubber silicone. The end result is significant isolation gains in STC and IIC for both walls and ceilings, even in the most basic of assemblies. No other products are needed to meet or exceed building code for STC and IIC in walls and ceilings. HushFrame Rafts with single layer drywall and no underlayment on the floor above is all you need. Simple fool proof installation for a simple assembly with exceptional performance!

  • Installs to the side of the framing, whether wood or steel, either flush with the face of the framing or recessed into the cavity. Flush installations lose 1" of space and recessed installations lose as little as 1/4" of space (plus the thickness of drywall).
  • Standard 1x wood furring or metal furring hat channel can be used.
  • When wood furring is used on ceilings, all interior walls can be built beneath the decouple ceiling and fastened directly to the wood furring. When wood furring is used on walls, cabinets (both upper and base) can be fastened directly to the furring.
  • Works in both standard or recessed installations meaning you can mix and match installation style without buying different types of connectors and more costly connectors.
50 STC and 50 IIC ratings in wood structures can be attained without the addition of rubber underlayment, Green Glue Compound, mass loaded vinyl, or double layer drywall. This makes for a very cost effective assembly that meets or exceeds building code requirements. Add a second layer of drywall and your STC is over 60 and your IIC is 56. An incredible amount of isolation with such a minor investment in cost, and if installed recessed with furring parallel to the joists, then only 1/4" loss of headroom!

We estimate 1 Raft per 3.5 square feet for standard installation in walls and ceiling. If you space the Rafts further apart with rows 24" on center and each Raft up to 48" apart, then estimate about 1 every 4.5 square feet. All leftover material is returnable so we recommend ordering more than you need and returning when the project is completed.

Download The Manufacturer's Installation Guide 5.8 MB

The HushFrame Raft is installed flush with the side of the framing or recessed for a lower profile installation. If installed flush with the side of the framing, then the wood furring or hat channel will run perpendicular to the framing. If installed recessed for a lower profile installation, then the wood furring or hat channel will run parallel to the framing. This is the same for both wood and steel framing in both walls and ceilings. Use two standard 1.5" or longer wood framing screws to attach each Raft and two 1.5" wood framing screws at each furring connection point.

Review the quick animated installation video below for a simple explanation of how this product installs.

HushFrame Raft Connector Specs
Coverage 1 raft per 3.5 square feet
Dimensions 4-7/8" x 2" x 2-1/4"
Added Depth 1/4" to 1", depending if Raft is recessed or flush with side of framing
Material Wood and silicone rubber
Fire Ratings
 Class 'B' Fire Rated. 1 hour UL assemblies: U263 (ceiling), U311, U340, U344, W307 (load bearing walls - single, staggered, shear walls, and exterior walls)
Spacing Follow standard 24" on center spacing for most areas. 8" on center spacing on the short edge of each panel where two panels come together.
Fasteners Use 1" or longer coarse thread framing screws
Load Limit Recommended max 50 pounds shear and 80 pounds tension. Failure only at 3 times the weight for both shear and tension.
Performance Adds 14-21 STC points to standard wall. Adds 10+ STC points and 14-18 IIC points to standard floor/ceiling.
Version 300 Series
HushFrame Raft Connector Downloads
HushFrame Raft Product Data and Submittal Sheet DownloadPDF 262 KB
Installation Guide in English DownloadPDF 5.82 MB
HushFrame Raft Spacing DownloadPDF 544 KB
HushFrame Raft Steel Stud Installation and Test DownloadPDF 1.4 MB
HushFrame Shear Test DownloadPDF 3.13 MB
HushFrame Tension Test DownloadPDF 2.87 MB
UL Assembly Test Report DownloadPDF 5.8 MB

The performance gains achieved in wood or metal structures with HushFrame Raft Connectors are significant. The HushFrame Rafts have been been tested for STC, OITC, IIC, and is a Class B Fire Rated product with an approved 1 hour UL rating.

*All test results shown in this table were achieved through third party testing from accredited laboratories. The full test is available upon request.

Independent Sound Test Results
Type Assembly STC IIC
Exterior Wood Wall Base assembly, 2x4 framing, 1 layer drywall interior, 1 layer Hardi exterior 47 -
Exterior Wood Wall 2x4 framing, 1 layer drywall on HushFrame Rafts interior, 1 layer Hardi exterior 57 -
Interior Wood Wall Base assembly, 2x4 framing, 1 layer drywall on both sides 39 -
Interior Wood Wall 2x4 framing, 1 layer of drywall on HushFrame Rafts, 1 layer of drywall on other side 53 -
Interior Wood Wall 2x4 framing, 2 layers of drywall on HushFrame Rafts, 1 layer of drywall on other side 57 -
Interior Wood Wall 2x6 framing, 1 layer drywall on HushFrame Rafts, 1 layer drywall on other side 56 -
Interior Wood Wall 2x6 framing, 2 layers of drywall on HushFrame Rafts, 1 layer drywall on other side 60 -
Interior Wood Wall 2x6 framing, 2 layers of drywall on HushFrame Rafts, 2 layers of drywall on other side 63 -
Steel Studs 2x6 Staggered steel stud, 1 layer drywall on both sides 58 -
Steel Studs 2x6 Staggered steel stud, 1 layer drywall on HushFrame Rafts, 1 layer drywall on other side 67 -
Steel Studs 2x4 20 gauge steel stud, 2 layers of drywall on HushFrame Rafts, 2 layers of drywall on other side 65 -
Steel Studs 2.5" 25 gauge steel stud, 1 layer of drywall on HushFrame Rafts, 1 layer of drywall on other side 54 -
Steel Studs 2.5" 25 gauge steel stud, 2 layers of drywall on HushFrame Rafts, 2 layer of drywall on other side 64 -
Wood Ceiling Joists Base assembly, wood joists, 2 layers of OSB on the joists, drywall ceiling suspended by wood furring strips 50 38
Wood Ceiling Joists Wood joists, 2 layers of OSB on the joists, ceiling suspended with HushFrame Rafts, 1 layer of drywall 59 50
Wood Ceiling Joists Wood joists, 2 layers of OSB on the joists, ceiling suspended with HushFrame Rafts, 2 layers of drywall 61 56

*Performance gains by adding a layer of drywall to either side of the wall were consistent between 2x4 and 2x6 wood framing.
**Wood furring was used on wood assembly tests, metal hat channel was used on steel stud tests.