Q. What is HushFrame? A. A brand of sound isolating Raft connectors. The term "HushFrame" is a proprietary trademark.
Q. What are Raft Connector? A. Simple wood and silicone devices that are installed inside walls & floor/ceiling assemblies of buildings to attenuate the noise that can pass through the assemblies.
Q. Why are they called "Raft" connectors? A. They're called Raft connectors because just like a wooden raft floats on water, these Raft connectors float the wall, ceiling, or floor finish on the assembly superstructure. The term "Raft" is a proprietary trademark.
Q. What does "ViBridge" sound control technology mean? A. The term "ViBridge" is a proprietary trademark and it represents the patent pending design, configuration, and performance of the silicone core of the Raft connectors. Q. How do you define noise? A. The definition of noise is any unwanted sound.
Q. How do Raft Connectors attenuate sound? A. The Raft Connectors route the structure-borne sound vibration through the Raft connectors, where the sound waves travel into the silicone core, get bogged down, and their energy dissipates as a small measure of heat.
Q. Why have Raft connectors been developed? A. To fill the need for an inexpensive and simple solution for builders to obtain code mandated STC and IIC ratings for lightly framed building assemblies in multi-unit construction.
Q. What are they made from? A. Two plywood components, a structure mount and a finish mount, separated and securely held by a core of silicone rubber.
Q. Why are HushFrame Raft connectors made of wood when I see many types of sound clips made of metal available on the market? A. In response to industry demands for a noise control solution that is wood-system friendly ... and HushFrame Raft connectors are exactly that. They can be installed with nails, screws or adhesives, they can be cut, trimmed or modified, and most importantly, they don't require the use of metal hat channel.
Q. How effective are they? A. In a word, very. A typical installation will result in a 50% to 80% reduction of noise moving through a given assembly.
Q. Are HushFrame Raft connectors expensive? How do they compare with metal clips? A. HushFrame Raft connectors are less expensive than metal clips and when you factor in the simplicity of installation, there's significant labor savings as well. Arguably the lowest cost noise isolation technology per installed decibel of reduction.
Q. How are Raft connectors used? A. Raft connectors can be installed on the face of studs, rafters and joists or they can be installed inside the stud or joist bay. They are also mounted on concrete walls and slabs, on top of wood sheathed floor decks, as well as utilized in the vibration isolation of pipes and mechanical equipment.
Q. How are Raft connectors attached? A. Typically they are installed utilizing screws, but nails and a limited number of adhesives are also possible. Check out the installation guide for guidance.
Q. Can I use metal hat channels with Raft connectors? A. Yes, while raft connectors were specifically developed for the wood-based stud-frame industry, nothing precludes attaching metal hat channel to the Raft connectors in place of wood furring, and the Raft connectors perform just as well when they are attached to metal studs and joists.
Q. Can Raft connectors be modified? A. Yes, to a degree, trimming the structure mounts to fit tight spaces for example, but care must be taken to avoid 'short circuiting' as is outlined in the Installation Guide.
Q. How much living space is lost when I install Raft connectors? A. Very little. Depending on the device and application chosen, you can effectively eliminate your noise problem with as small an increase in assembly depth as 1/4" but 1" would be typical.
Q. How long will HushFrame Raft connectors last? A. They should last the life of the building. HushFrame Raft connectors utilize pure silicone rubber for the core which is unaffected by chemical or atmospheric assault. The silicone manufacturer offers 50 years as a minimum.
Q. Are HushFrame Raft connectors fire rated? A. Yes, the raft connectors have a Class 'B' fire rating, the same rating as the framing lumber they attach to. They offer a layer of security in that the temperatures where wood framed assemblies combust are normal operating temperatures for the silicone core, meaning the raft connectors will be that last component to fail.
Q. Have HushFrame Raft connectors been acoustically tested? A. Yes, by Riverbank Acoustical Laboratories. Extensive certified acoustical laboratory testing shows that HushFrame Raft connector sound attenuation performance matches or exceeds that of the most effective alternative technologies currently available.
Q. How strong are they? Have HushFrame Raft connectors undergone structural testing? A. Surprisingly strong, the raft connectors can actually withstand a multiple of the rated loading. While the silicone core is flexible, it is also very strong and tenacious. Production of HushFrame Raft connectors are tested routinely for tension, shear, and compression loading utilizing a Test Resources 140Q dual column test system.
Q. What does 'STC' stand for? A. It stands for Sound Transmission Class and it is an integer rating of how well a building partition attenuates airborne sound. In the USA, it is widely used to rate walls, floor/ceiling assemblies, doors, windows, and exterior wall configurations (see ASTM International Classification E413 and E90).
Q. What does 'IIC' stand for? A. It stands for Impact Insulation Class and it is an integer-number rating of how well a building floor assembly attenuates impact sounds, such as footsteps. A larger number means more attenuation. The scale, like the decibel scale for sound, is logarithmic. The IIC is derived from ASTM method E989, which in turn uses a tapping machine specified in ASTM method E492.
Q. What does the building code require? A. The IBC and State codes require a minimum STC and IIC rating of 50 for wall, and floor/ceiling assemblies separating dwelling units and between the units and the common, and service areas of buildings.
Q. What does 'short circuiting' mean? A. An example of short circuiting is when the fasteners securing the furring to the finish mount of the connector, are too long or over-driven so the fastener traverses the silicone core and makes contact with the structure mount. This allows the sound vibrations to travel directly across the fastener to the opposite mount unimpeded, bypassing the attenuating effects of the silicone core.
Q. What does 'flanking' mean? A. Flanking occurs when sound vibration finds an unprotected path around the attenuating assembly construction, either around the perimeter or through improperly protected penetrations such as light fixtures, switch boxes, ducts, or pipes.
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