Installation Guide

Sub-Floor Preparation

Prior to installing the FIBREfon 21C, ensure that the substrate is level and structurally sound. The floor should have a tolerance of at least SR2, this equates to a maximum 5mm gap over a two metre straight edge.

A concrete floor should have a maximum relative humidity of 75% or lower when measured in accordance with BS8203. If this level is not reached a DPM should be designed in. Please seek the advise of a specialist if deemed necessary.

Levelling Subfloors

Concrete floors can be levelled using floor using Cellecta Cellecta ’s RL24 levelling compound. Begin by priming and sealing the Primer to the clean dry surface using a long handled foam roller and bucket - do not pour directly onto the floor. On highly absorbent surfaces where the primer soaks in quickly, apply a second coat approximately 30 minutes after the first. Allow to thoroughly dry (approx 2-4 hours).

In a clean container, mix Cellecta RL24 in a ratio of 25kg dry powder to 6 litres of clean water into a smooth and lump free consistency (ratio to be maintained for part quantities).

Using a smoothing trowel, apply to the prepared surface to the required thickness. Allow to fully dry before proceeding (24 hours @ 3mm).

Installation of FIBREfon 21C

Starting in the far left-hand corner of the room, install packers against both walls and install the first FIBREfon 21C with the tongue of the short and long side facing the wall; you do not need to remove the tongue of the chipboard.

An expansion gap of 10mm or 2mm per metre run of floor, whichever is greater, should be left against the walls.

TOP TIP - Do not use the YELOfon FS/ES in place of packers as this is a compressible material.

Run a bead of Cellecta fon Adhesive along the short groove of the FIBREfon 21C. Install the second board with the tongue of the short edge placed into the groove of first board. Ensure the joints are flush and there are no gaps between the boards.

At wall abutments, measure the gap from the laid FIBREfon 21C to the wall allowing for an expansion gap as detailed above between the wall and the overlay board.

Using a hand or circular saw cut the FIBREfon 21C to the required length in a well ven lated area. Ensure suitable PPE is used when cu ng the boards in accordance with the Safety Data Sheet, a copy of which can be supplied upon request.

Apply fon Adhesive in the groove and install the cut board to complete the row. Ensure there are no gaps between the joints of the board.

Run a bead of Cellecta fon Adhesive along the long edge of the first board of FIBREfon 21C. Ensuring the cut is on the outside, use the off cut of FIBREfon 21C to begin the next row. Where possible, it is advised that any off cut should be no less than 200mm in width.

Install the remainder of the 21C in a brick bond form on ensuring all boards are glued and gently interlocked. It is important that none of the boards are in contact with any walls or door treatments, as this can result in acoustic failure. Intermediate gaps (min. 10mm) should be incorporated for floors in excess of 10m long (eg. corridors).

Remove the packing shims from around the FIBREfon 21C and install YELOfon ES5/60 around all perimeters to isolate the 28C and stop flanking transmission.

Any soil pipes or services that penetrate the FIBREfon 21C should be isolated from the board using YELOfon ES5/60.

All plasterboard, as well as the skirting boards, must be isolated from the FIBREfon 21C by the YELOfon Strip.

Both load-bearing walls and non-load-bearing partitions must be built off the concrete floor and not the FIBREfon 21C. All walls and partitions must then be isolated from the acoustic treatment with a flanking strip.

FIBREfon 21C is a floating floor treatment and therefore does not need to be mechanically fixed to the concrete floor. Any mechanical fixings penetrating the 21C may result in acoustic failure.

Once installation is complete, trim back any excess flanking strip with a sharp knife prior to the installation of the floor finishes.

Allow the adhesive to fully cure for up to 48 hours prior to trafficking the floor or installing floor finishes.

Sanitary Wear & Kitchen Units

All kitchen units and sanitary ware can be built off the concrete floor or FIBREfon 21C. Care must be taken to ensure that any mechanical fixings do not penetrate the resilient layer.

If building off the concrete floor ensure a gap is le􀀁 between units and the acoustic flooring and any floor finish. Seal any gaps with a suitable mastic.

If required, raise the height of the sanitary wear or units to suit the finished height of the acoustic flooring and selected floor finish.

Floor Finishes

All floor finishes should be installed in line with the manufacturer's official guidance and the relevant British Standards.

Due to the natural thermal expansion of chipboard-based products a decoupling layer is highly recommended prior to the installation of sensitive floor finishes, such as vinyl or tiles. For more information, contact our technical department on 01634 296677