Celbar Wall Spray System

What is Celbar?

Download the Brochure

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Celbar Cellulose Insulation Brochure

Download Specifications

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Celbar Cellulose Insulation Specifications
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Celbar is a blend of specially prepared cellulose fibers, organic in nature, treated with adhesive and fire resistant chemicals. When sprayed in place, the interlocking fibers result in a mass that produces excellent sound and thermal properties. Celbar effectively reduces sound and heat transfer by creating dead air spaces between and within its fibers. This process seals cracks and holes in the wallboard, around plumbing and electrical outlets, vent ducts and other irregularities. There are no compressed areas or voids to allow sound leaks, R-value reduction, or air infiltration.

How does Celbar Work?

Celbar encompasses the entire cavity and has an R-value of 3.8 per inch. Celbar also stops air infiltration, keeping a cool house cool, and a warm house warm.

How is Celbar Installed?


Celbar is spray-applied in wall, floor, and ceiling cavities to form a monolithic coating.

Celbar being sprayed into a wall cavity



Celbar is applied just beyond the studs ensuring maximum coverage. Celbar is then planed flat creating an even, complete thermal barrier.

Stud Scrubbing Celbar to make a flat and complete thermal barrier


Sound Control

Floor Plan for Sound Walls
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With the popularity of home entertainment centers, surround sound speaker systems and other sound sources, interior noise pollution must be addressed. Applying Celbar wall spray within interior walls greatly reduces the sound that moves through the wall providing a quieter, more comfortable room.

Reduce Noise Between Floors

Floor Plan for Sound Walls
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Celbar Wall spray, applied between floors of multi-level dwellings helps reduce airborne noise such as voices, radios, televisions and other annoying sounds. In combination with resilient channels, Celbar wall spray reduces the impact or foot-fall noises that are very common.

Compare Insulations

Fiberglass Vs CelbarShown on the left is a comparison of Fiberglass and Celbar. Note that fitting around pipes and wires compresses fiberglass, affecting it’s overall R-Value. Also, Fiberglass leaves air gaps around electrical outlets and other irregularities.


Sprayed Fiberglass
Fiberglass Batts
Cotton Batts
Open-cell low-density polyurethane Sprayed Foam (Soy)
Close-cell spray polyurethane Sprayed Foam
R-Value per inch 3.6-4.0 2.2-40. 3.7 3.7 3.6 5.8 The higher the number the better R-value can be achieved with less thickness.
Meets air barrier requirements without extra materials and work X X Spray Foam is an effective air barrier however house wraps, joint sealed OSB, plywood, and gypsum drywall are also air barriers. Visit www.airbarrier.org or www.buildingscience.com regarding the importance of walls to breathe.
Easily insulates irregular or hard-to-reach spaces X X X X Difficult for batt materials to achieve. Easy to achieve with sprayed materials; whether cellulose, fiberglass, or foam.
No HFAs, HCFCs, or HFCs used X X X X X Close-cell polyurethane contains HFC-245fa blowing agent which can have an impact on global warming.
Contains no formaldehyde X X X X Members of the Fiberglass industry have introduced a Formaldehyde Free product in recent years although not all fiberglass products are.
No harmful emissions after installation or drying X X X X Although no harmful emissions are present after installation or drying. Both foam products are quite toxic during installation and require respirators or supplied air. Several days are required for airing out the property before occupancy.
Can be injected in closed cavities X X X X Cellulose insulation was the original material used for this application and remains the preferred material by Federal Weatherization programs. Some foam products require bracing every 3 feet for piping and wiring to resist movement by expanding foam.
Mold resistant X X X X X X Chemical additives in cellulose and other products allows them to pass the ASTM C739 Fungi Resistance test.
Settles over time X Celluose insulation does settle over time and if it is not installed correctly, with the correct depth to account for this then there will be a potential loss in R-value. Packaging identifies correct depth, after settling, to achieve desired R-value.
“Wick Water” X X X X You shouldn’t get water in the wall but if you do, you want it to spread by wicking to speed drying rather than pooling in one spot. Cellulose insulation passes ASTM C739 Moisture Vapor Absorption test
Not Damaged by Water X X All insulation materials lose R-value when exposed to water as the water fills trapped air spaces even if it does not directly affect the insulation material. Water is not preferred for any building material.
Controls Airborne Sound Transfer X X X X X X Foams, cellulose, and fiberglass reduce sound transmission.