Somewhere in the product comparison spreadsheet, a facilities manager hits a row labelled “cellulose spray” next to a row labelled “fiberglass spray” and has no real way to tell them apart beyond price. Both get described as spray applied acoustic insulation. Both promise sound absorption. The spec sheets use almost identical language. And the supplier on the phone isn’t exactly rushing to explain the difference in a way that might lose the sale.
So let’s actually explain it, plainly, because the two materials behave differently enough on site that the choice matters, particularly once fire rating, moisture, and climate come into the conversation, three things that matter more in the UAE than almost anywhere else.
What Cellulose Spray Actually Is
Cellulose insulation is manufactured from recycled paper fibre, treated with borate compounds for fire resistance and pest deterrence, then applied either as a dry blown fill or, for acoustic and wall applications, as a damp spray that mixes the fibre with a fine water spray at the nozzle. Once applied, it settles into a dense, fibrous mass that fills cavities completely, including around wiring, framing, and other irregular obstructions that leave gaps in less flexible materials.
That density is the headline property. Cellulose’s dense pack installation method, filling a cavity completely without voids, is the mechanism behind its sound dampening performance, since sound has a much harder time finding a path through a fully packed, irregular fibrous mass than through a material that leaves even small air gaps. Recycled content typically runs very high, often cited well above 80%, which also makes it one of the more sustainable options in the acoustic materials category.
Cellulose Versus Fiberglass Spray, Honestly
Both materials get specified for similar jobs, exposed ceilings, wall cavities, irregular surfaces, but they’re genuinely not interchangeable, and the right choice depends on the project’s priorities.
| Factor | Cellulose Spray | Fiberglass Spray |
| Sound absorption | Generally strong due to dense, gap free fill | Strong, especially mid to high frequency range |
| Fire performance | Requires borate treatment, check certification | Inherently non combustible as a material |
| Moisture tolerance | More sensitive to prolonged moisture exposure | Better tolerance in humid or damp conditions |
| Recycled content | Very high, often over 80% | Moderate, improving with manufacturer |
| Exposed finish applications | Less common for visible exposed ceilings | Well established for exposed structural applications |
| Climate suitability | Needs careful specification in humid climates | Generally more stable across humidity swings |
That moisture line matters more than any other row in the UAE specifically. Cellulose performs excellently in controlled, dry environments, but humidity swings and the risk of condensation in certain building types need to be assessed carefully before specifying it for a project here, particularly anywhere with intermittent AC operation or envelope conditions that could trap moisture against the material over time. This isn’t a reason to rule cellulose out, it’s a reason to get the application context right before committing, which is exactly the kind of assessment that separates a spec that works from one that causes a callback in eighteen months.
Where Each Material Actually Wins
Fiberglass based sprays, including products like Sonoglass, have an established track record on large exposed structural applications, corrugated steel decking, warehouse ceilings, parking structures, specifically because the material’s inherent fire performance and moisture stability suit spaces that are left permanently exposed and unconditioned. That’s why AKINCO’s exclusive distribution partnership with Monoglass centres on fiberglass based Sonoglass for these large scale, structurally exposed applications across the UAE.
Cellulose earns its place in a different context, enclosed wall and ceiling cavities in conditioned, climate controlled spaces, residential and office partition walls specifically, where sound dampening between rooms is the priority and the material sits concealed behind a finished surface rather than left exposed. In that application, cellulose’s ability to pack completely around framing, services penetrations, and irregular cavity shapes genuinely outperforms batt style insulation at blocking sound transfer, since gaps are exactly where sound finds its way through.
The Question Worth Asking Before Specifying Either
The real decision point isn’t “which spray insulation is better” in the abstract, it’s “what is this surface going to look like, and what environment will it sit in long term.” Exposed, unconditioned, structurally complex surfaces generally point toward fiberglass based spray systems. Concealed, conditioned wall and ceiling cavities where the priority is sound transfer between rooms generally make cellulose worth considering, provided the moisture risk has been properly assessed for the specific building envelope.
For projects where the surface is exposed and the fire compliance review will be strict, schools, hospitals, industrial facilities with structural fireproofing already in place, acoustic spray insulation based on fiberglass tends to be the safer specification, partly because it can be applied directly over existing fireproofing without compromising the rating underneath, a detail that matters enormously on steel deck construction.
For concealed cavity applications where absorption and sound dampening within a partition wall is the goal, it’s worth discussing cellulose specifically with an acoustic engineer who can confirm the moisture and ventilation conditions of that particular wall assembly before committing, rather than assuming it behaves identically to how it performs in a cooler, drier climate elsewhere.
Spray applied insulation has genuinely grown as a specification category across the UAE over the past several years, as more contractors move away from forcing rigid panel systems onto surfaces that were never designed to accept them. Getting the right material for the right surface, rather than defaulting to whichever spray is cheapest per square metre, is what actually determines whether that spec performs for the life of the building.
Is your project dealing with an exposed structural surface or a concealed wall cavity? Tell us which, and we’ll tell you honestly which spray material actually fits the job.Somewhere in the product comparison spreadsheet, a facilities manager hits a row labelled “cellulose spray” next to a row labelled “fiberglass spray” and has no real way to tell them apart beyond price. Both get described as spray applied acoustic insulation. Both promise sound absorption. The spec sheets use almost identical language. And the supplier on the phone isn’t exactly rushing to explain the difference in a way that might lose the sale.
So let’s actually explain it, plainly, because the two materials behave differently enough on site that the choice matters, particularly once fire rating, moisture, and climate come into the conversation, three things that matter more in the UAE than almost anywhere else.
What Cellulose Spray Actually Is
Cellulose insulation is manufactured from recycled paper fibre, treated with borate compounds for fire resistance and pest deterrence, then applied either as a dry blown fill or, for acoustic and wall applications, as a damp spray that mixes the fibre with a fine water spray at the nozzle. Once applied, it settles into a dense, fibrous mass that fills cavities completely, including around wiring, framing, and other irregular obstructions that leave gaps in less flexible materials.
That density is the headline property. Cellulose’s dense pack installation method, filling a cavity completely without voids, is the mechanism behind its sound dampening performance, since sound has a much harder time finding a path through a fully packed, irregular fibrous mass than through a material that leaves even small air gaps. Recycled content typically runs very high, often cited well above 80%, which also makes it one of the more sustainable options in the acoustic materials category.
Cellulose Versus Fiberglass Spray, Honestly
Both materials get specified for similar jobs, exposed ceilings, wall cavities, irregular surfaces, but they’re genuinely not interchangeable, and the right choice depends on the project’s priorities.
| Factor | Cellulose Spray | Fiberglass Spray |
| Sound absorption | Generally strong due to dense, gap free fill | Strong, especially mid to high frequency range |
| Fire performance | Requires borate treatment, check certification | Inherently non combustible as a material |
| Moisture tolerance | More sensitive to prolonged moisture exposure | Better tolerance in humid or damp conditions |
| Recycled content | Very high, often over 80% | Moderate, improving with manufacturer |
| Exposed finish applications | Less common for visible exposed ceilings | Well established for exposed structural applications |
| Climate suitability | Needs careful specification in humid climates | Generally more stable across humidity swings |
That moisture line matters more than any other row in the UAE specifically. Cellulose performs excellently in controlled, dry environments, but humidity swings and the risk of condensation in certain building types need to be assessed carefully before specifying it for a project here, particularly anywhere with intermittent AC operation or envelope conditions that could trap moisture against the material over time. This isn’t a reason to rule cellulose out, it’s a reason to get the application context right before committing, which is exactly the kind of assessment that separates a spec that works from one that causes a callback in eighteen months.
Where Each Material Actually Wins
Fiberglass based sprays, including products like Sonoglass, have an established track record on large exposed structural applications, corrugated steel decking, warehouse ceilings, parking structures, specifically because the material’s inherent fire performance and moisture stability suit spaces that are left permanently exposed and unconditioned. That’s why AKINCO’s exclusive distribution partnership with Monoglass centres on fiberglass based Sonoglass for these large scale, structurally exposed applications across the UAE.
Cellulose earns its place in a different context, enclosed wall and ceiling cavities in conditioned, climate controlled spaces, residential and office partition walls specifically, where sound dampening between rooms is the priority and the material sits concealed behind a finished surface rather than left exposed. In that application, cellulose’s ability to pack completely around framing, services penetrations, and irregular cavity shapes genuinely outperforms batt style insulation at blocking sound transfer, since gaps are exactly where sound finds its way through.
The Question Worth Asking Before Specifying Either
The real decision point isn’t “which spray insulation is better” in the abstract, it’s “what is this surface going to look like, and what environment will it sit in long term.” Exposed, unconditioned, structurally complex surfaces generally point toward fiberglass based spray systems. Concealed, conditioned wall and ceiling cavities where the priority is sound transfer between rooms generally make cellulose worth considering, provided the moisture risk has been properly assessed for the specific building envelope.
For projects where the surface is exposed and the fire compliance review will be strict, schools, hospitals, industrial facilities with structural fireproofing already in place, acoustic spray insulation based on fiberglass tends to be the safer specification, partly because it can be applied directly over existing fireproofing without compromising the rating underneath, a detail that matters enormously on steel deck construction.
For concealed cavity applications where absorption and sound dampening within a partition wall is the goal, it’s worth discussing cellulose specifically with an acoustic engineer who can confirm the moisture and ventilation conditions of that particular wall assembly before committing, rather than assuming it behaves identically to how it performs in a cooler, drier climate elsewhere.
Spray applied insulation has genuinely grown as a specification category across the UAE over the past several years, as more contractors move away from forcing rigid panel systems onto surfaces that were never designed to accept them. Getting the right material for the right surface, rather than defaulting to whichever spray is cheapest per square metre, is what actually determines whether that spec performs for the life of the building.
Is your project dealing with an exposed structural surface or a concealed wall cavity? Tell us which, and we’ll tell you honestly which spray material actually fits the job.
