Acoustic Insulation
Corpus sync: neutrality remakes, note hygiene, datasheet relocation, transformer-split cross-refs
Showing changes from Rev 6
to Rev 7
in Acoustic Insulation.
---
title: Acoustic Insulation
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−# Materials {toc}
+# General Material Requirements {toc}
−## General Material Requirements {toc}
+## All acoustic insulation shall be new, dry, undamaged, and free of compression set, oil, dust, or other contamination at time of installation.
−### All acoustic insulation shall be new, dry, undamaged, and free of compression set, oil, dust, or other contamination at time of installation.
+## Bundles that have been wetted, crushed in transit, or stored improperly shall be inspected and replaced where the fiber matrix has been disturbed.
−### Bundles that have been wetted, crushed in transit, or stored improperly shall be inspected and replaced where the fiber matrix has been disturbed.
+## Insulation shall be stored indoors in a dry, climate-controlled location, off the ground, and protected from weather, mechanical damage, and UV exposure until immediately before installation.
−### Insulation shall be stored indoors in a dry, climate-controlled location, off the ground, and protected from weather, mechanical damage, and UV exposure until immediately before installation.
+## Plastic shipping wrap shall remain in place until the bundle is brought to its point of installation.
−### Plastic shipping wrap shall remain in place until the bundle is brought to its point of installation.
+# Stone Wool (Mineral Wool, Rock Wool) {toc}
−## Stone Wool (Mineral Wool, Rock Wool) {toc}
+## Stone wool insulation is manufactured by melting basalt or other igneous rock together with a binder and spinning the molten material into fine fibers. {note}
+## The resulting product is inorganic, noncombustible, dimensionally stable at elevated temperature, and naturally water-shedding rather than water-absorbing. {note}
−### Stone wool insulation is manufactured by melting basalt or other igneous rock together with a binder and spinning the molten material into fine fibers. {note}
−### The resulting product is inorganic, noncombustible, dimensionally stable at elevated temperature, and naturally water-shedding rather than water-absorbing. {note}
+## Stone wool batt and blanket for cavity-infill acoustic use shall conform to ASTM C665 (Type I, unfaced) where used in light-frame stud cavities, or to ASTM C553 for industrial and commercial blanket applications.
−### Stone wool batt and blanket for cavity-infill acoustic use shall conform to ASTM C665 (Type I, unfaced) where used in light-frame stud cavities, or to ASTM C553 for industrial and commercial blanket applications.
+## Mineral wool board (semi-rigid and rigid) shall conform to ASTM C612.
−### Mineral wool board (semi-rigid and rigid) shall conform to ASTM C612.
+## Stone wool is the default acoustic cavity-fill material for commercial gypsum-board partition assemblies in this standard because of its effective acoustic absorption at modest densities, noncombustibility per ASTM E136, friction-fit retention in vertical cavities, dimensional stability, and resistance to settling. {note}
−### Stone wool is the default acoustic cavity-fill material for commercial gypsum-board partition assemblies in this standard because of its effective acoustic absorption at modest densities, noncombustibility per ASTM E136, friction-fit retention in vertical cavities, dimensional stability, and resistance to settling. {note}
+## Stone wool batts are dimensionally stiffer than glass fiber and hold their shape in tall partition cavities, masonry cavity walls, and ceiling-plenum applications where glass fiber would sag or compress over time. {note}
−### Stone wool batts are dimensionally stiffer than glass fiber and hold their shape in tall partition cavities, masonry cavity walls, and ceiling-plenum applications where glass fiber would sag or compress over time. {note}
+# Slag Wool {toc}
−## Slag Wool {toc}
+## Slag wool is manufactured from blast furnace slag using the same melt-and-spin process as stone wool. {note}
+## The fiber properties, density range, and acoustic performance are similar to stone wool, and slag wool products in the U.S. market are typically marketed under the broader "mineral wool" designation alongside stone wool. {note}
−### Slag wool is manufactured from blast furnace slag using the same melt-and-spin process as stone wool. {note}
−### The fiber properties, density range, and acoustic performance are similar to stone wool, and slag wool products in the U.S. market are typically marketed under the broader "mineral wool" designation alongside stone wool. {note}
+## Slag wool shall conform to the same ASTM C665, C553, or C612 designations that apply to stone wool products and may be used wherever stone wool is specified, unless the contract documents specifically require stone wool.
−### Slag wool shall conform to the same ASTM C665, C553, or C612 designations that apply to stone wool products and may be used wherever stone wool is specified, unless the contract documents specifically require stone wool.
+## Where the project specification or design number cites "mineral wool" without further qualification, either stone wool or slag wool meeting the cited ASTM standard is acceptable.
−### Where the project specification or design number cites "mineral wool" without further qualification, either stone wool or slag wool meeting the cited ASTM standard is acceptable.
+# Glass Fiber (Fiberglass) {toc}
−## Glass Fiber (Fiberglass) {toc}
+## Glass fiber insulation is manufactured by melting silica sand and recycled glass and spinning the molten material into fine fibers, bound together with a binder resin. {note}
+## Glass fiber is the most economical acoustic cavity-fill material and is appropriate for the majority of non-rated and lower-STC commercial partitions. {note}
−### Glass fiber insulation is manufactured by melting silica sand and recycled glass and spinning the molten material into fine fibers, bound together with a binder resin. {note}
−### Glass fiber is the most economical acoustic cavity-fill material and is appropriate for the majority of non-rated and lower-STC commercial partitions. {note}
+## Unfaced glass fiber batt and blanket for cavity-infill acoustic use shall conform to ASTM C665 (Type I, unfaced) for light-frame construction or to ASTM C553 for commercial and industrial blanket.
−### Unfaced glass fiber batt and blanket for cavity-infill acoustic use shall conform to ASTM C665 (Type I, unfaced) for light-frame construction or to ASTM C553 for commercial and industrial blanket.
+## Faced glass fiber products that include kraft or foil facings introduce combustible material and are not appropriate where ASTM E136 noncombustibility is required.
−### Faced glass fiber products that include kraft or foil facings introduce combustible material and are not appropriate where ASTM E136 noncombustibility is required.
+## Glass fiber batts in low-density configurations (0.5 to 1.5 pcf) are less dimensionally stiff than mineral wool and may sag over time in tall vertical cavities or in plenum applications unless they are mechanically retained. {note}
−### Glass fiber batts in low-density configurations (0.5 to 1.5 pcf) are less dimensionally stiff than mineral wool and may sag over time in tall vertical cavities or in plenum applications unless they are mechanically retained. {note}
+## Heavier-density glass fiber blanket products (2.0 pcf and above) approach mineral wool in dimensional stability and are appropriate for most commercial partition cavities. {note}
−### Heavier-density glass fiber blanket products (2.0 pcf and above) approach mineral wool in dimensional stability and are appropriate for most commercial partition cavities. {note}
+## Material and Designation Selection {toc}
−### Material and Designation Selection {toc}
−
```datasheet
label: Acoustic Insulation Material
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```
−## Facing {toc}
+# Facing {toc}
−### Vapor-retarder facings (kraft, foil, or vinyl) interrupt the porous flow path that produces acoustic absorption, have a small but measurable effect on the cavity's transmission loss, and introduce combustible material into the cavity that is generally not compatible with the noncombustibility requirements of rated assemblies. {note}
+## Vapor-retarder facings (kraft, foil, or vinyl) interrupt the porous flow path that produces acoustic absorption, have a small but measurable effect on the cavity's transmission loss, and introduce combustible material into the cavity that is generally not compatible with the noncombustibility requirements of rated assemblies. {note}
−### Acoustic cavity-fill insulation in interior partitions, ceiling plenums, and floor cavities shall be unfaced.
+## Acoustic cavity-fill insulation in interior partitions, ceiling plenums, and floor cavities shall be unfaced.
−### Where vapor management is required by the assembly, the Contractor shall coordinate with [[sync/building-thermal-insulation]] for the placement of a separate vapor retarder layer and shall use an unfaced acoustic product for the cavity-fill function.
+## Where vapor management is required by the assembly, the Contractor shall coordinate with [[sync/building-thermal-insulation]] for the placement of a separate vapor retarder layer and shall use an unfaced acoustic product for the cavity-fill function.
−### Insulation Facing {toc}
+## Insulation Facing {toc}
```datasheet
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### The Contractor shall document any conditions observed during installation that may affect the long-term performance of the insulation — evidence of water infiltration, inadequate climate control, or trades disturbing previously installed cavity insulation — and shall bring them to the Architect's attention before the cavity is closed.