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Acoustic Joist Cap   (Unit Price £5.95)

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50mm x 50mm x 50mm



Product Summary

The Joist Cap is the first acoustic joist treatments which combines low cost with effective sound attenuation

Product Application

Where you are looking to create a floating floor working directly off joists then the joist cap is very cost effective means of doing so.

The joist caps fit snugly onto the existing joists up to a width of 50mm. A floating tongue and groove floor( typically tongue and groove chipboard can then be floated on top of it. We would recommend the use of angled flanking band in this set up to effectively seal the sides of the floating floor.

A superb, easy to fit, Direct To Joist System, engineered as a Part E compliant acoustic joist treatment, to save the developer time and money. It can be used in both new build and refurbishment projects for timber and masonry builds.


This product, used upside down, can also provide the resilient layer required for customers to make up their own resilient battens.

If the product is used in this manner, on a concrete floor, impact improvements in the order of: :
Delta L w22dB with a standard batten
Delta L w24dB with a deep batten can be expected.
Robust Details only require an improvement of Delta L w17dB

If the product is used in this manner, on a timber floor, improvements in the order of:
Delta R w+C; tr14dB and
Delta L w20dB can be expected.
Robust Details only require an improvement of:
Delta R w+C; tr13dB and
Delta L w15dB


Installation Guide

Care should be taken to comply with all relevant Safety and Building Regulations.

The Joist Cap can be fitted from either above or below the joists and even before the joists are fitted.

The jaws of the caps are slightly tapered in to ensure a tight friction fit. Simply open the jaws and sit the cap over the joist ensuring the base is located tightly with the joist surface.

In all applications, our perimeter isolation strip must be used so the floating floor is fully isolated for the structural floor and walls.

Product Description

The joist cap is extruded from a low density high attenuation foam based on a combination of polyolefin and specialist additives to produce foam which exhibits superior acoustic characteristics. The Joist Cap profile has been scientifically designed so that one size fits tightly over a rough cut or planed standard nominal 50mm joist resulting in a stable floating floor surface, completely isolated from the rest of the structure.
The castellated top contact surface optimises the acoustic attenuation properties of the foam. By moving the mass layer above the resilient layer the floating element forms a stiffer structure spreading the load and lessening the diaphragm affect, whilst the resilient layer acts to dampen and absorb the sound energy.


Acoustic Joist caps
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