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SIF type floor hangers

Floor Hanger Soundproofing with Joist Hangers

Floor Hanger Soundproofing - How it works

Floor hangers are an excellent system for reducing floor impact and airborne sound while retaining original floorboards. This system allows the retention of the existing floor boards but with minimal (7mm ) raise in the height of the floor. The new floor effectively sits upon a cushioned hanger that houses 19mm plasterboard.
The new floor is screwed into the flanges of the hanger rather than back into the joist. The system creates a floating floor and allows the customer to retain original floorboards.

For customers looking to insulate noisy pipes please see our acoustic pipe wrap.

Soundproofing basics

When it comes to soundproofing your floor, it is important to establish what you are trying to achieve. Are you trying to stop noise from below reaching you, or are you trying to eradicate your impact noise passing down to your neighbours?

In practice, most people are aiming at stopping the sounds from below traveling upwards. Many products on the market boast great soundproofing credentials (particularly rubber mat or underlay solutions) but the figures quoted are almost always referring to a reduction in impact sound and are of very little use in identifying how much airborne sound is being reduced.

Understanding Performance
At the foot of the page you will see a performance table.

The total performance that is normally quoted on most sites refers to  impact sound only. However if you are worried about sound rising from below you should only consider the airborne sound number (which is rarely quoted)

We also give an indication of acoustic performance uplift. Remember that every 10dB of performance uplift corresponds to roughly a 50% improvement in the performance of the floor. So 20dB would indicate a 75% Improvement over and above the original floor.

Important Note*

As a consumer, comparing different products from different companies is very difficult. While we talk about improvement in decibels in all our tables many other companies will state a single figure for their products which is often in excess of 40 or even 50dB. It is really important to understand that these figures invariably refer to the performance of a whole floor/ceiling structure, and this will include a standardised floor and ceiling that will already have a soundproofing value. 

There is no single product in existence, to our knowledge that will provide in excess of 40 dB when added to a standard floor ceiling divide ( plasterboard ceiling and wooden floor).

In an attempt to level the playing field, we are taking a standard ceiling; 12mm plasterboard, a void and 18 mm floor boards as our case study. We believe that this construction has an acoustic performance of about 34 dB rw (airborne). The final column of our table gives an indication of we believe our system might achieve in Rw(simple airborne performance) terms.

An important word about regulation E (the sound test required for conversions) . We have a dedicated regulation E web site The figures in the above tables do not take into account Ctr corrections so do not attempt to create an off the shelf solution for regulation E.


Key Points:

  • A slim fitting floor soundproofing solution
  • The only solution available for those who wish to float original flooboards
  • Three levels of acoustic protection
  • Online calculator will work out your exact requirements
  • Soundproofing kit delivered to your door in 48 hours


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SIF Under Floor Hangers Sound Insulation performance table

Floor Depth Gain Total system Performance airborne Typical Airborne Improvement Typical Impact Improvement
For retaining existing floorboards 7mm 53dB 17dB 15dB

Compare all our floor solutions here.

*Please note figures stated for total system are based on a a timber joist ceiling floor construction with 200mm joist. The figures are Lab figures and are Ctr corrected. So are not comparable to regulation E Systems. The improvement figures state improvement over a regular timber floor and plasterboard ceiling.