Government Tender Published for Primary Hanging Framework,High-Density Cementitious Board Layer 1,Limp Mass Acoustic Barrier Layer, in MANDI, HIMACHAL PRADESH

Providing lightweight metal framework from GI aluminium MS sections suspended from primary isolated framework using neoprene isolation washers resilient clips. No rigid connection to RCC slab or masonry walls. Complete with all fixings.

Providing 5mm thick high surface density flexible acoustic membrane limp-mass type having material density 1900 to 2000 kg per cubic meter and minimum surface density 9.5 kg per square meter. Membrane laid with minimum 50mm overlap at joints bonded using flexible acoustic adhesive with all overlaps fully sealed.

Providing 50mm deep GI channel framework forming absorptive cavity infilled with 50mm thick high-density mineral wool insulation Rockwool type with minimum density 98 kg per cubic meter. Cut accurately and friction-fitted between channels ensuring full contact without gaps or compression.

Providing lightweight secondary metal framework from GI aluminium MS sections suspended exclusively from primary isolated framework using neoprene isolation washers resilient clips. Forms independent support system for inner acoustic finishes.

Supplying and fixing absorptive and diffusive acoustic foam modules DAC-Speech-Pure 50mm DAC-Speech-Edge 50mm DAC-Speech-Calm 50mm DAC-Speech-V-absorb 50mm for Capture Room. Open-cell fire-retardant acoustic foam modules with deep absorptive profiled geometry mounted on secondary framework using mechanical clips hook-and-rail systems.

Providing 12mm thick high-density cementitious fibre board to isolated GI framework using corrosion-resistant screws. Boards with staggered joints. Continuous 5 to 10mm perimeter gap maintained and sealed using non-hardening acoustic sealant. All joints airtight sealed.

Providing 12mm thick high-density cementitious fibre board to isolated GI framework using corrosion-resistant screws. Boards with staggered joints and tight butt joints. Continuous 5 to 10mm perimeter gap maintained and sealed. All service cut-outs sealed airtight.

Providing magnesite-bonded pine wood fibre acoustic wall panels surface painted with kerfed long edges. Size 600 by 1200 by 20mm with minimum density 400 kg per cubic meter. Green-certified and low-VOC compliant. Fixed on concealed GI framing with H-spline jointing achieving NRC 0.70 and SAA 0.70.

Providing fabricating supplying and fixing engineered plywood wall panels as integral part of inner chamber geometry. Panels configured for absorptive mode and diffusive mode mounted on precision sliding rotating hinged mechanisms complete with tracks bearings guides and stops.

Providing combination of DAC-SPEECH Calm mid-high frequency control zones and diffusive surface exposure to maintain speech clarity while avoiding over-damping ensuring natural interaction conditions for recording and human-machine studies.

Providing corner bass traps at room corners wall-wall and wall-ceiling junctions using high-density mineral wool insulation minimum 60 kg per cubic meter preferred 80 to 100 kg per cubic meter. Formed in triangular diagonal configuration with minimum effective depth 300mm and face width 450mm complete with framing and fire-retardant fabric.

Providing Mass Loaded Vinyl MLV 5mm thick with density 1900 to 2000 kg per cubic meter and minimum surface density 9.5 kg per square meter laid directly on RCC floor. Sheets laid flat with minimum 50mm overlap at joints. Joints sealed using flexible acoustic adhesive sealing tape. Turn-up MLV at perimeter walls by 50 to 75mm.

Providing treated timber sleepers seasoned straight knot-free typically 50mm minimum depth or as required for stiffness. Sleepers to sit within U-boats with no rigid fixing into RCC slab. Perimeter isolation gap of 10mm from all walls and columns maintained.

Providing minimum 18mm thick exterior-grade plywood BWP or minimum 18 to 25mm cement fibre board as subfloor laid over sleepers. Joints staggered. Fixing to timber sleepers only using screws with no fixing to penetrate RCC. All joints sealed with flexible sealant.

Providing and installing acoustic-grade carpet tile or roll with acoustic underlay as required suitable for low-noise walking and improved footfall control. Adhesive if used to be low-VOC and compatible with underlay.

Providing complete acoustic door sealing system comprising continuous compression-type perimeter seals magnetic or equivalent at head and jambs and automatic drop-down acoustic bottom seal suitable for achieving airtight closure for NC-20 or better low-noise environments.

Mode-based validation testing carried out and documented for highly absorptive anechoic-biased mode recording interaction mode absorptive diffusive and capture motion-capture mode configurations. All modes to comply with specified acoustic intent.