SoundPro CDM-ISO-LAT. Acoustic solution for floating isolated floors

Transcription

1 Jun 21 WILHAMS INSULATION FAR EAST SDN BHD SoundPro Acoustic solution for floating isolated floors Battens are designed to optimise sound insulation and impact isolation of floor constructions. They are used in both wet and dry floating floor constructions and achieve resonant frequencies of 6 to 1Hz. CDM-ISO- PERIMETER STRIP Finishing CDM Material Mineral Wool battens com in 3m lengths, have 3 different stiffnesses, each in 3 different thicknesses (3mm, mm, and 5mm). The 3 different stiffness rails are: -L (for Low Loads) -M (for Medium Loads) -H (for High Loads) Required Data for Design: required performance, e.g. insertion loss or natural frequency imposed permanent and temporary working loads type f timber floor, e.g. concrete or timber etc... contact surface (type and dimensions)

2 Application systems are used in case very high isolation performances must be obtained with respect to airborne and impact noise, and when the floor loads are uniformly spread over the floor surface. This easy-to-install system can be used for wet (concrete floating slab) as well as for dry (wooden floating floor) applications, and is always built on site. Description d The system basically consists of 3m long galvanized steel lats (U-profiled rails) into which small CDM pads have been integrated in the factory (375mm ax-ax distance between the pads). Since the pads are not glued or screwed into the lats, they can still be taken out or moved when necessary. In case of a uniform floor loading, the lats must be spaced at regular distances ~,3m ~,m ~,5m ~,6m, depending on the bending stiffness of what comes on top. In case the loads are not very uniformly distributed over the floor surface, one must determine which type of lat to put where. Generally it is also recommended to put a lat all along the perimeter of the floating slab, at a fixed distance of ~ 1mm to the floor edge (or perimeter wall), in order to compensate the possible higher loading of that perimeter zone (e.g. furniture). The lats do not have to be glued or fixed to the structural floor. The coverplate can be OSB, MDF, multiplex, fibrocement, plywood, metal decking, etc. If concrete is to be poured on top, one formwork plate is considered sufficient (bending to be checked), and a PVC protection film must be installed before the pouring to avoid concrete water from penetrating the acoustical void underneath. Incase of a «dry floor», it is best to install minimum 2 layers of OSB, MDF, so that the second (top) layer covers the joints of the first layer. Optionally, one can foresee a thin high-damping layer (usually in cork elastomer of 3mm to 5mm thickness) to be installed in between these 2 coverplates in order to increase the acoustical isolation of the floor. Also important is the perimeter isolation strip, made of mineral wool or a flexible elastomer with a minimal thickness of 1mm to decouple the floating floor from the surrounding walls, columns, etc.(aim = avoiding acoustical bridges). The following lats are standards, but as a matter of fact almost any of the CDM-SOLIDS can be used to suit the purpose: 1. Low load lats for dry floors (31mm 1mm 51mm free height). 2. Medium load lats for dry and wet floors (31mm 1mm 51mm free height). 3. High load lats for wet floors (31mm 1mm 51mm free height). The data sheets of these 3 standards are attached. The higher the pads, the higher the resilience and thus also the isolation efficiency. However, one must make sure there is never any risk for instability nor discomfort while using the floor. A combination of a (light) dry floor supported on high pads is therefore not ideal. Since the air stiffness is playing an important role indiscrete isolator setups, the void height is sometimes increased to reduce the influence of the air stiffness since K air = (11/void height) per mm² floor surface, where h = air void height, and K = K + K (per mm²). floor air pads This is possible in one of the following ways: Wooden beams installed on top of the lats, in the perpendicular direction (onto which the cover plates are fixed).

3 Using metal decking on top of the lats in case of a concrete slab. Because of the wavy shape, the air volume in the void is considerably higher than with flat cover plates. Another advantage of this method is that because of the high bending stiffness of the metal decking, the distances between the lats can be increased (for instance to ~1,5m), thereby reducing the required quantity of lats (higher pad type to be used). For stability reasons during the construction process, the lats are in that case often «doubled», meaning 2 lats next to each other, fixed by means of a galvanized steel cover plate. Simply putting the lats on top of an overheight made of wooden beams, masonry or concrete (in the same direction as the lats). Installation To avoid «standing wave effects» in the void (causing possible breakthroughs at certain high frequencies), it is useful to integrate an absorption layer in mineral wool of light density. This layer is to be installed in between the lats and should have a thickness inferior to the height of the loaded pads, allowing for the air to move freely. Although all CDM-SOLIDS are creep controlled, it may be useful to monitor the static deflection of the floating slab at least during the first months after installation, for instance at some strategic points.

4 DRY SETUP Finishing CDM Material Mineral Wool CDM-ISO-PERIMETER STRIP

5 WET SETUP Finishing Concrete PE Foil Mineral Wool Lateral Isolation

6 Product sheet LAT-3 type LAT-3 LAT-3 LAT-3 Bearing type Bearing constitution NR NR NR Static load range per bearing [N/mm²] Maximum total load per bearing [N/mm²] Bearing creep rate [%/Dec.] 1.5 (.2 N/mm²). (. N/mm²).5 (1. N/mm²) Bearing density [kg/m³] Bearing colour Red Blue Brown Bearing dimensions [mm] A=, B=36, H=3 1. Static stiffness [MN/m/m] 2.5 Dynamic stiffness [MN/m/m] Deflection [mm] 2 16 Resonance frequency [Hz] LAT-3-9 Hz

7 Product sheet LAT- type LAT - LAT- LAT- Bearing type 79 1 Bearing constitution NR NR NR Static load range per bearing [N/mm²] Maximum total load per bearing [N/mm²] Bearing creep rate [%/Dec.] 1.5 (.2 N/mm²). (. N/mm²).5 (1. N/mm²) Bearing density [kg/m³] Bearing colour Red Blue Brown Bearing dimensions [mm] A=, B=36, H= 1. Static stiffness [MN/m/m] 2. Dynamic stiffness [MN/m/m] Deflection [mm] 2 16 Resonance frequency [Hz] LAT- 7- Hz

8 Product sheet LAT-5 type LAT-5 LAT-5 LAT-5 Bearing type Bearing constitution NR NR NR Static load range per bearing [N/mm²] Maximum total load per bearing [N/mm²] Bearing creep rate [%/Dec.] 1.5 (.2 N/mm²). (. N/mm²).5 (1. N/mm²) Bearing density [kg/m³] Bearing colour Red Blue Brown Bearing dimensions [mm] A=, B=36, H=5 1. Static stiffness [MN/m/m] 2. Dynamic stiffness [MN/m/m] Static deflection [mm] 2 16 Resonance frequency [Hz] LAT Hz

9 CDM-ISO-FLOAT TEST DATA SHEET CDM product tested Description Tested by Test site Test date Test method Measured parameter(s) floating floor system on discrete isolators WTCB (B) WTCB Lab (B) 5/1/199 Following NBN S1., ISO 1 part 6, ISO 717 Ln Setup 1) floating floor = Rhine sand + treillis 65mm or plasterboard 25mm 2) mm OSB plate 3) absorption in mineral wool 3mm ) isolator = CDM-1 pads of 3x3x3mm 5) base floor = 16mm reinforced concrete 6) beam of reinforced concrete as raised skirting 2x15mm 7) NA ) NA 9) NA 1) NA Results Frequency [Hz] Base floor [db] CDM-1 with 65mm concrete tile [db] CDM-1 with plasterboard [db] Lnw [db] Lw [db] 2 33 IIC LnA [db] Base floor CDM-1 with 65mm concrete tile CDM-1 with plasterboard Acoustical isolation Third octaves [Hz] SoundPro is the registered trademark of Wilhams Insulation Far East Sdn Bhd Wilhams Insulation Far East Sdn Bhd 15 & 17 Jalan Utarid U5/23 Mah Sing Integrated Industrial Park 15 Shah Alam, Selangor, Malaysia Tel : Fax : wilhams@wilhams.com.my Website : IMPORTANT NOTICE: Any directions for use are given for guidance only and are not intended to form part of any contract. They should be varied or adapted to suit your particular materials or conditions of use. Goods supplied by the company are made to approved standards from the highest quality raw materials but no warranty or guarantee is given as to their suitability for any particular purpose or application, and no liability is accepted for any loss or damage arising directly or indirectly from the use of the Company s products irrespective of any information given to us as to intended use of such products. It is therefore recommended that prospective users should test a sample of this product under their own conditions to satisfy themselves that the product to be used is suitable for that purpose intended.