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Floor Joist Isolators (Case of 50)

2475 in stock



If you are soundproofing a room, it’s important not to neglect the floor. While most sound transmission may come through walls, any barrier between you and the outside of your space needs to be reinforced against sound to truly protect you from unwanted noise transmission.

Part of soundproofing your floor is isolating the flooring from the structural assembly. This is important due to the problem of impact noise, noise caused by vibrations and impacts rather than through airborne frequencies. This noise can be just as distracting as airborne noise.

Block Vibrational Noise Through the Floor

Therefore, for true floor noise and sound reduction, you need Floor Joist Isolators. These are U-shaped pieces of thermoplastic, which is known for its sound control properties. The pieces fit around your joists and block the vibrational noise from coming through your floor. The isolators can fit on any 2X lumber product, and they are easy to install.

In fact, you simply fit them over the joist and snap them into place. There are no tools of any kind required, and anyone can do it, so if you are working on a do-it-yourself soundproofing project like creating a home recording studio, these are a perfect item to include.

Before laying down sound-deadening rugs, barriers or other floor soundproofing material, you need to control for vibrational noise. With our Floor Joist Isolators, you have the tools you need. For an affordable, effective addition to a complete floor soundproofing solution, order your Floor Joist Isolators from Soundproof Cow today.


Dimensions 2 1/2 in. x 2 in.
Thickness 1 1/4 in.
Weight 20 lbs./case
Coverage 64 sqft. when placed on 16 in. centers
Quantity Case of 50
Availability Usually ships in 1-3 business days
Technical Data Product Data Sheet


Floor Joist Isolators are a U-shaped isolation product constructed from a medium density thermoplastic which is designed to isolate vibration and structural noise transmission. Floor Joist Isolators improve a flooring assembly’s Sound Transmission Class (STC) and Impact Insulation Class (IIC) by decoupling the flooring from the structural supports which provides a reduction of sound transmission, especially the hard to control low frequency sounds. The Stud Beam Isolators are sized to fit any 2X lumber product, are very easy to install and are best used for new construction when floor joists are exposed.

Product Availability

Case of 50 (64 sqft when place on 16 in. centers)
Case of 100 (128 sqft when place on 16 in. centers)

Features / Benefits

Good Soundproofing Performance — Floor Joist Isolators are attached to floor joists in order to structurally isolate floor surfaces, including substrates, from the structural support elements. They are a cost effective product that reduces sound transmission through floor or ceiling assemblies. Floor Joist Isolators are perfect for applications that use the “Box in a Box” or “Room in a Room” construction methods commonly used when building a professional home theater or recording studio environment.

Quality — Floor Joist Isolators are made from a medium density thermoplastic that is commonly used to make vibration isolation feet or vibration damping pads for large industrial machinery. The raw material is a time tested vibration isolating material.

Ease of Installation — Floor Joist Isolators are friction fit over any wood with a 2 inch width (actual width equals 1.5”). No messy glues or adhesives are needed to install is product. No tools required!

Cost Effective Soundproofing — Floor Joist Isolators are our most cost effective sound isolation product due to the ease of installation. Labor costs are minimal to install this product.

Light Weight and Low Profile — Floor Joist Isolators are designed to provide effective soundproofing performance with minimum added weight and thickness. The low profile maximizes valuable square footage.

In-stock — We stock Floor Joist Isolators in large quantities. Most orders are filled and shipped the same day the product is ordered.

Made in the USA


Great for:

  • Professional and Home Theaters
  • Professional and Home Recording Studios
  • Band practice rooms
  • Broadcast Studios
  • Any environment that uses “Room in a Room” or “Box in a Box” construction method

Product Dimensions

Floor Joist Isolator Diagram

Installation Details

Tools Needed: None

Materials Needed: None

"The times I talked with you on the telephone and corresponded through email you have been very helpful and efficient. I would highly recommend Soundproofcow.com to anyone!" S. CIMINO, LA