Durabella Acoustic FFT system is a floating floor system, designed for acoustic control on timber joisted floor structures. The system comprises a 70mm x 46mm acoustic battenlaid over with gypsum based board ( nominal 13.5kg/m2) and a 18mm or 22mm moisture resistant chipboard. Mineral wool quilt is laid between the batted runs – 25mm 10-33kg/m2.
Site Preparation & Storage
The building should be dry and weather tight. If screed has been applied with must be fully cured. Block and beam or concrete plank floors should be fully grouted at all joints and perimeters. The floor where the acoustic batten flooring is to be installed should be dry, reasonably smooth and free of debris. All components of the acoustic batten flooring should be stored inside, under cover in dry conditions. Therefore, they should be stored in the location where they are to be used and at least 48 hours prior to installation. Adhesives should be stored within recommended temperature limits as defined by the manufacturer.
Installation of an Acoustic FFT System will require the use of:
- Chalk string line
- Tape measure
- Circular saw
- Utility knife
- Battery Drill
- Countersink bit
Damp proof membrane
On ground floor slabs and new concrete bases above ground level a damp proof membrane with a minimum 1000 gauge is recommended. Joints should be lapped by a minimum of 150mm, Joints should be taped and sealed with a waterproof adhesive tape. The edges should be upturned at the perimeter wall to the same height as the overlay boards.
Firstly, services should be installed between the battens and before the flooring is fixed. Secondly, services at the perimeter wall must be a kept at minimum of 150mm from the wall to allow for the perimeter batten and should not be grouped wider than the available batten spacing. Where services penetrate through the floor the hole should be larger than the service pipe. To prevent airborne sound transmission the hole should be sealed with an acoustic sealant.
Note: Different batten spacing can be adopted to accommodate existing services, additional header support battens and cradles may be required where the ends of the board fall short of the main batten structure.
Acoustic or thermal insulation
Acoustic or thermal insulation quilt can be laid between the battens, if required with the Acoustic FFT system.
The information in the chart below indicates the recommended batten spacings and the finished floor heights for the acoustic FFT system.
When using stone, marble or ceramic tiled finishes it is recommended that plywood is used as the overlay board and that a modern flexible adhesive and grout is used.
In areas which are likely to be subject to heavy loading, such as kitchens and bathrooms, communal areas, like corridors, hallways and landings in apartment buildings, hotels and schools etc. the spacing of the acoustic battens should be reduced to 300mm.
Where services are installed beneath the flooring and access is required removable access panels can be fitted to form duct runs. For instance, noggins should be inserted, in the way, so that all the edges of the removable panel are supported and the panel should be secured using screws. If there is a requirement for frequent access, panel fixings suitable for frequent access are available from Durabella DesignADeck.
Internal masonry walls should be built from the concrete base prior to the installation of the Durabella acoustic batten flooring.
Where lightweight timber or metal stud partitions are used, these may be built off the floating floor providing a double row of battens is installed beneath the partitions.
To provide additional support at door thresholds, an acoustic batten should be laid across the threshold.
Laying the acoustic battens
The acoustic battens should be laid in accordance with the centres recommended in the table above. Commence in corridors and proceed into rooms to ensure a consistent level.
Start by measuring and marking out the perimeter batten round the edges of the room leaving a 50mm gap between the wall and the batten. Lay the perimeter batten with the rubber isolation pads in contact with the sub-floor.
If non load bearing partitions or increased loadings are required in any areas these areas should be marked out.
Further measure the batten centres from the furthest point from the doorway. Mark out every centre e.g. every 400mm for the batten at 400mm centres. From the opposite side of the room mark out the same spacings then use a chalk string line, ping or mark between the matching marked points.
Battens should be laid in a staggered formation. When laying alternate rows commence with a half batten so that the ends of the battens are staggered. Starting at the perimeter lay the battens along the marked lines. Batten ends must not come into contact with the perimeter wall.
Lay acoustic or thermal insulation quilt between the battens if required.
Laying the overlay board
Use the correct thickness of overlay board to suit the battens centres of the acoustic FFT system. 18mm thick for batten centres of up to 400mm and 22mm thick for batten centres up to 600mm. Do not exceed these centres.
Starting at the perimeter edge apply the Durabella adhesive to the top of the battens and lay the plaster boards at 90°to the battens maintaining the 10mm gap at the perimeter. Boards should be secured to the batten using countersunk wood screws. Perimeter fixings on the long edge of the boards should not exceed 600mm. Apply adhesive to the tongue and groove of the 18mm or 22mm chipboard/ plywood boards as they are laid. Boards should be installed in a brick/staggered pattern across the entire floor.
Boards should be laid so the ends of the boards in one row are at least 400mm from the ends of the boards in the adjoining row.
Edges on the short side of the boards must join on a batten or be supported with intermediate cradles and batten. Screw down the boards at 300mm along the battens and at 150mm from the long edge perimeter. Where short edges meet, these should be screwed down both sides of the join. Expansion joints will be required where the flooring exceeds 5m in length such as in long corridors. A 2mm gap should be allowed for each metre of flooring.
The Durabella resilient flanking strip should be inserted into the perimeter gap around the walls between the flooring and the walls. Once the skirting has been fitted, any excess flanking strip can be neatly trimmed with a utility knife.
All Durabella battens are 46mm wide and 2400mm long. Battens are available in a range of sizes to meet your flooring height requirements from 15mm to 115mm. Battens are constructed of softwood timber with 10mm rubber crumb pads bonded to the underside. 100% recycled rubber crumb is used in the production of the acoustic pads. Acoustic battens can be treated with fire retardant if required, on request.
A variety of acoustic battens are also available with different isolation pads suitable for various types of end user requirements such as in industrial settings requiring vibration control, performance floors in gyms, theatres and sports centres.
Acoustic battens are also available in hardwood and in carbon neutral bamboo.
Hardwood strip flooring may also be laid direct onto the battens and without the need to lay the overlay board.
Please refer to www.durabella.com for more information on Durabella flooring systems or call us on 01274 533311.