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VARIQUIET
SPECIFICATION |
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SCOPE
OF WORK
Supply of
perforated
metal panel
work on wall
including the
necessary
acoustical
insulation,
furring
channels and
all related
fasteners,
trims and
flashing as
per HESCO
standard
details and
shop drawings.
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PRODUCTION
DESCRIPTION
Variquiet,
field
Assembled
Acoustical
Wall Panel
System having
a perforated
metal liner
and acoustical
insulation
fixed on hat
shape furring
channels.
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METAL
PANELS
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Perforated steel panels, 305 mm wide, formed from galvanized steel sheets gage 0.60 mm to 0.75 mm and conforming to ASTM A446 structural quality with hot dipped commercial quality galvanization designation G-90.
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Perforation shall be in diameter 3mm and spaced 10mm staggered to achieve noise reduction coefficient (NRC) of 0.95 or better.
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Side joint shall be in male/female interlocking type formed from solid material. Side joints shall be formed as per HESCO standard details and shall be sealed using a special EPDM neoprene gasket.
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Panel finish shall be in high quality multi-layered baked coating having HESCO standard bone white colour at the exposed face and a standard wash coat at the back face. The finish type and specifications shall be one of HESCO standard coating which is polyester finish for internal or Kynar PVF-2 for external use or depending on the application
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ACOUSTICAL INSULATION
Fiberglass blanket insulation, approximately 38 - 50 mm thick and have special properties to achieve NRC value of 0.95 or better and shall be foil faced or vinyl backed at one side. Wire mesh spacer made of galvanized steel mesh approximately 25 x 25 mm shall be used between perforated sheets and acoustical insulation.
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FURRING CHANNELS
Hat shape galvanized steel conforming to ASTM A446 designation G-90 having a gage of approximately 0.7 mm or as recommended by HESCO. depth, girth and spacing of furring channels shall be as per HESCO standard details and recommendation.
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VARIQUIET INSTALLATION INSTRUCTION
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Securely fasten hat-shaped furring channel to walls using special concrete fasteners as per HESCO standard and recommendation.
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Install perforated metal panels plumb in proper alignment level to within a ratio of 1 to 500 and in strictly accordance with HESCO shop drawings and instructions. Arrange panels symmetrically on each surface, unless otherwise indicated lay wire mesh spacer in perforated panels before placing acoustical insulation to keep insulation slightly back from perforated face.
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Acoustical insulation shall be a snug fit in perforated panels.
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Cut metal panels shall be at least 50 percent of unit width. Scribe panels to fit adjacent work. Apply trim and fastenings as per HESCO standard details and recommendation.
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FASTENERS
Concealed fastening system using stainless steel fasteners to fix panels to furring channels and stainless steel pop rivets for fix the necessary flashing shall be provided by HESCO as per HESCO engineering details and standard practice.
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TRIMS AND FLASHING
using solid material having the same gage, finish and matching colour as that of the perforated panels. flashing location, girth and fixing details shall be in accordance with HESCO standard engineering details.
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TYPICAL DETAIL
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