---
title: "Correctional Insulation: The Practical K-13 Guide For Group I-3"
description: "Correctional insulation under IBC Group I-3: where K-13 sprayed fiber belongs in a jail, what the finish table requires, and what is not published."
url: "https://bahlfireproofing.com/correctional-insulation-k-13-detention-centers/"
---

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# Correctional Insulation: The Practical K-13 Guide for Group I-3

- [Ross Bahl](https://bahlfireproofing.com/author/rossbahl/)
- September 21, 2026
- 10:00 am

Correctional insulation: the practical k-13 guide for group i-3 2

Jails and detention centers are built from the hardest surfaces in commercial construction: concrete, block, steel, and coated masonry. That makes them loud, and it makes every ceiling decision a security decision at the same time. This article covers how correctional insulation gets specified under IBC Group I-3, what K-13 sprayed fiber does and does not do in a detention building, and which rooms it actually belongs in.

**TLDR:** Correctional insulation gets specified backwards on most detention projects. The material does not decide where it goes; the Group I-3 condition and whether an inmate can reach the ceiling plane decide where it goes, and the product question comes after that. K-13 tests far inside the strictest interior finish class the code puts on a jail. Its manufacturer publishes nothing about tamper resistance, and that gap is the whole specification.

---

## The Ceiling That Comes Out After the Building Opens

The expensive version of this mistake is not a rejected submittal. It is a finish that passes final, runs a year, and then gets demolished out of an occupied secure building because an incident report named it.

The shape is always the same. An absorptive sprayed ceiling gets drawn across the housing pod dayrooms because someone wanted the noise down. The plane sits low enough that a person on a bolted-down table can reach it. Within a year the fiber has been picked at in three places, the operator wants it gone, and demolition happens inside a live housing unit with a custody escort on the crew.

Nothing about the material failed. It was never tested for that. The specification asked a thermal and acoustical insulation to serve as a security surface, and no published manufacturer document says it can. Correctional insulation goes wrong here more than anywhere else in the building.

## What Group I-3 Covers, and Why the Condition Number Matters

Section 308.4 of the International Building Code places a building in Institutional Group I-3 when it is occupied by more than five persons under restraint or security. The section names the types outright: correctional centers, detention centers, jails, prerelease centers, prisons, and reformatories.

What most contractors miss sits one layer below. Sections 308.4.1 through 308.4.5 divide the occupancy into five conditions, and the condition drives more of the project than the letter does.

- **Condition 1** allows free movement from sleeping areas to the exterior, and may be constructed as Group R.
- **Condition 2** allows free movement to other smoke compartments, with egress to the exterior impeded by locked exits.
- **Condition 3** allows free movement within a smoke compartment, with egress from it impeded by remote-controlled release.
- **Condition 4** restricts movement from an occupied space, with remote-controlled release to reach other spaces.
- **Condition 5** restricts movement from an occupied space, with staff-controlled manual release required.

Read those in order and you have a reach map. Condition 1 and Condition 2 spaces behave more like a dormitory than a cell block. Condition 4 and Condition 5 spaces are where staff control every door and the ceiling is the least supervised surface in the room.

Group I-3 also pulls in Section 408, the special detailed requirements for the occupancy. Section 408.6 requires each story containing sleeping units, and any story with an occupant load of 50 or more, to be divided into at least two smoke compartments. Section 408.9 covers smoke control. Neither is an insulation provision, but both decide where the ceiling plane gets interrupted. The [International Code Council](https://www.iccsafe.org/) publishes these provisions; confirm the adopted edition with the authority having jurisdiction.

## The Pattern I See on Detention Work

I have been spraying insulation and fire protection across Texas, Kansas, and Oklahoma for more than twenty years, and detention jobs go wrong in a way that belongs to detention. People assume the risk is buying a material that is too soft. The real risk is that nobody drew a line on the plan between spaces an inmate can touch and spaces an inmate cannot.

That line is rarely on the set. Security zones exist, smoke compartments exist, sight lines exist. A reach line does not, so one hatch pattern carries a ceiling finish across a whole floor plate and lands it in a dayroom and a mechanical room on the same note.

The prevention is cheap. Before we price a detention ceiling we ask for the I-3 condition, the room schedule, and the reflected ceiling plan, then mark every room where the finished height puts the plane within reach of a fixed object. Those rooms go back to the architect, and what is left is where sprayed fiber does honest work.

## What K-13 Is Before Anyone Calls It Correctional Insulation

K-13 is a spray-applied thermal and acoustical insulation, installed as an exposed ceiling finish over a structural deck. It is a cellulose fiber applied wet with adhesive, and it follows deck flutes and congested bays no tile ceiling can track. The manufacturer is International Cellulose Corporation of Houston, which abbreviates itself ICC. The International Code Council uses the same three letters, so keep those two apart on a submittal.

The published values worth carrying into a detention specification are short. R-value is 3.7 per inch. Bond strength exceeds 150 pounds per square foot tested to ASTM E736. Nominal density is 3.5 pounds per cubic foot per UL ER5499-01, revised September 19, 2016. Five standard colors are offered, Black, Gray, Light Gray, White, and Tan, plus custom matching. It goes up to 5 inches thick in a single application without mechanical support, and only contractors licensed by International Cellulose install it.

One thing it is not. K-13 is not a fireproofing product and contributes no fire-resistance rating. Rated steel gets a spray-applied fire-resistive material, and K-13 is listed in UL BXUV designs as an allowable sprayed fiber over it. Confirm the design number in UL Product iQ.

## What International Cellulose Publishes About Tamper Resistance

Nothing. That is the honest answer and it is the most useful sentence here.

International Cellulose publishes no detention-specific security data for K-13. No vandal-resistance testing. No tamper or pick-resistance testing. No ligature-resistance testing. If a rep or a specification calls K-13 a tamper-resistant detention ceiling, ask for the document. There is not one.

Two published lines get stretched to fill that gap, and both are generic. The manufacturer’s FAQ says its products provide a strong resilient bond and can withstand incidental impact, which describes material staying attached to a deck rather than a person working at it for weeks. Protek-13 is described as resisting abrasion and preventing picking away of the fibers, which is a coating description rather than a detention rating.

The bond figure gets misread the same way. Greater than 150 pounds per square foot to ASTM E736 measures adhesion and cohesion, meaning whether applied material stays on its substrate under load. It is a quality-control test, not a measure of what a determined person removes by hand.

Here is the number that prices the tradeoff. Over 1.75 inches of K-13, Protek-13 tests at NRC 0.95, where that same 1.75 inches uncoated tests at 1.00. The only published abrasion answer in the product line costs measurable sound absorption, and it still does not make a security ceiling.

So the assessment goes where it belongs. Tamper exposure, contraband concealment, and ligature risk in inmate-accessible space belong to the licensed architect or engineer of record and the authority having jurisdiction. Detention-rated security ceilings are a separate product category with their own testing.

## Where Correctional Insulation Belongs in a Detention Building

Correctional insulation is a zoning question before it is a product question. Below is the markup we put on a reflected ceiling plan before pricing, and the third column decides the row.

Space Typical ceiling Inmate access to the ceiling plane Sprayed fiber suitability

Housing pod cells Hard lid, security grade Direct, unsupervised No, security ceiling scope

Housing pod dayrooms Exposed or hard lid Direct where height is low Architect and AHJ call, often excluded

Intake, booking, holding Hard lid Direct but supervised Architect and AHJ call

Secure corridors Exposed or hard lid Height dependent, supervised Case by case, Class A finish

Gymnasium, recreation, program rooms High exposed deck Indirect, height dependent Common fit on a high deck

Kitchen and laundry Exposed deck, high Worker access, supervised Case by case, moisture also governs

Staff, control, administration Exposed or suspended None Straightforward fit

Mechanical, support, sallyports Exposed deck, high None Straightforward fit

The staff, support, and vehicle rows are where sprayed fiber does uncomplicated work: high, exposed, out of reach, and often the noisiest bays in the building. The housing rows are where the call is not ours to make. Kitchen and laundry carry a second constraint, because Protek-13 can be swept, blown, or lightly washed but is not built for regular moisture.

## What the Interior Finish Table Requires in a Jail

Interior finish by occupancy sits in Table 803.13 of the 2018, 2021, and 2024 editions of the International Building Code. The 2015 edition numbered that table 803.11, and 2015 Section 803.12 is a different subject titled Stability. Cite the wrong number and you have told the plans examiner which edition you were reading.

For Group I-3 the table calls for Class A interior finish in interior exit stairways, ramps, and exit passageways; Class A in corridors and exit access stairway enclosures; and Class B in rooms and enclosed spaces.

Now the part that surprises people. In most occupancies the table relaxes a class when the building is sprinklered. For I-3 it does not. The sprinklered and nonsprinklered requirements are identical, so a fully sprinklered jail earns no interior finish relief, and a finish schedule copied from a sprinklered Group B project is wrong here before anyone reads a product name.

Section 803.1.2 defines the classes. Class A is a flame spread index of 0 to 25 with a smoke developed index of 0 to 450. Class B covers a flame spread index of 26 to 75, and Class C runs 76 to 200.

Against those thresholds K-13 is nowhere near the line. Tested to [ASTM E84 surface burning characteristics](https://store.astm.org/e0084-26a.html), K-13 returns a flame spread index of 5 and a smoke developed index of 5. Those are test results, not a class designation. Writing a tested score as though it were the Class A limit is the most common submittal error we see on correctional insulation.

A second route applies, separate from interior finish. Section 807 of the 2024 IBC covers insulation and sends it to Section 720, which splits by installed condition: 720.2 concealed, 720.3 exposed. An exposed ceiling lands in 720.3. They are not an exception pair. Both carry the same limits, a flame spread index of not more than 25 and a smoke developed index of not more than 450, and the 720.2 exception covers cellulosic loose-fill, which K-13 is not.

## Why Dayrooms and Gymnasiums Sound the Way They Do

A detention building is assembled from the most reflective materials available: concrete floors, block or precast walls, steel doors, coated masonry, and by design almost no soft goods. Sound put into the room stays in it, so reverberation builds and speech smears together. Staff describe the consequences before an acoustician does. Announcements are hard to make out, officer-to-officer communication across a dayroom takes shouting, and a twelve-hour shift in that room is fatiguing in a way that is not a comfort complaint. That is the real case for correctional insulation on a high exposed deck: the ceiling is the only large surface in these rooms not required to be hard.

Absorption is measured to the [ASTM C423 sound absorption test method](https://store.astm.org/c0423-23e01.html) and reported as a noise reduction coefficient for a specific thickness on a specific mounting. A bare NRC number with no thickness and no substrate is not usable. A dash means no published value.

K-13 thickness Solid backing 1.5-inch deck 2-inch deck 3-inch deck

1 inch 0.80 – 0.90 0.95

1.5 inches 0.90 1.05 – 1.00

1.75 inches 1.00 – – –

2 inches 1.00 – 1.05 –

2.75 inches – – – 1.05

3 inches 1.00 1.05 – –

4 inches 1.05 – – –

5 inches 1.00 – – –

Two things fall out. The curve is not monotonic: on solid backing it peaks at 1.05 at 4 inches and falls back to 1.00 at 5, so thicker is not automatically better. And substrate moves the result more than thickness does. The same 1.5 inches reads 0.90 on solid backing and 1.05 over 1.5-inch deck, because the flutes add cavity depth behind the fiber.

We priced a county recreation addition where the specification said NRC 1.05 with no thickness and no mounting named. On solid backing that takes 4 inches. The building was framed with 1.5-inch metal roof deck, where 1.5 inches reaches the same figure. Pull the deck profile before quoting acoustics on any detention job.

One boundary matters more here than anywhere else. NRC measures absorption within a space and says nothing about sound moving between spaces. Whether a cell hears the dayroom is a function of the wall and floor-ceiling assembly, measured as STC and IIC, which are assembly properties. International Cellulose publishes no STC or IIC values for K-13, so an NRC figure never converts into either.

## Correctional Insulation in Texas, Kansas, and Oklahoma

All three states run substantial state correctional systems, and all three have counties building and expanding jails on their own bond schedules. The complication is that the three do not adopt building codes on the same clock, and a detention project runs long enough for an edition to turn over mid-design.

Wichita is on the 2024 International Building Code. Jurisdictions elsewhere in Kansas, across Texas, and across Oklahoma each sit on their own schedule, which is why we ask which edition the building official enforces before writing anything into a submittal. Across a three-state portfolio the identical requirement carries table number 803.13 in one county and 803.11 in the next.

Texas county jail work adds a review layer that surprises out-of-state contractors. Along with the local building official, county jail construction answers to state jail standards administered through the Texas Commission on Jail Standards, on a separate calendar. Confirm the submittal path with the county before building a schedule around it.

Construction type matters too. Housing across this region tends to be precast concrete cells, while the dayrooms, gymnasiums, kitchens, and vehicle bays around them are steel framed with exposed metal roof deck. That flute profile is why the acoustic opportunity in a Texas or Oklahoma jail usually sits in the support and program buildings rather than the housing pods.

## Specifying Correctional Insulation on a Detention Project

1. **Get the I-3 condition in writing.** Ask which of Conditions 1 through 5 the project is designed to. It changes egress, barriers, and how supervised each ceiling plane is.
1. **Draw the reach line room by room.** Mark every space where a person on fixed furniture can touch the finished ceiling. Those rooms belong to the security ceiling scope.
1. **Send the tamper question to the right desk.** Contraband, tamper, and ligature calls belong to the licensed architect or engineer of record and the AHJ.
1. **Pull the deck profile before pricing acoustics.** Flute depth moves the NRC more than an extra half inch of material does.
1. **Separate the fire-resistance scope from the finish scope.** Rated steel gets a fire-resistive material, and sprayed fiber goes over it only inside a listed design.
1. **Check the finish class per location, not per building.** Corridors and exit enclosures ask for Class A, rooms ask for Class B, and sprinklers relax neither.
1. **Plan installation around custody.** Escorts, tool control, count times, and area shutdowns set the schedule in an occupied facility.

We will not print a per-square-foot figure for correctional insulation and neither should anyone else. No credible published installed price exists for this work in this market. Height, access, masking, deck profile, thickness, color, and escort requirements all move it. Get a project bid.

## Related Reading

- [K-13 Acoustic Performance: NRC Ratings by Thickness](https://bahlfireproofing.com/k-13-acoustic-performance-nrc-ratings/) goes deeper into thickness and substrate combinations.
- [K-13: The Complete Contractor Guide](https://bahlfireproofing.com/k-13-the-complete-contractor-guide/) covers the product, its limits, and its installation requirements end to end.
- [School Acoustic Insulation: K-13 Performance](https://bahlfireproofing.com/school-acoustic-insulation-k-13-performance/) applies the same absorption logic to another hard-surfaced institutional building.

## Frequently Asked Questions

**Is K-13 tamper resistant enough for a correctional facility?** International Cellulose publishes no tamper, vandal, pick, or ligature testing for K-13, so we do not make that claim and neither should a specification. The published statements are generic: a strong resilient bond that withstands incidental impact, and a Protek-13 coating that resists abrasion. Where inmates can reach the ceiling, the call belongs to the licensed architect or engineer and the AHJ.

**What occupancy classification applies to a jail or detention center?** Institutional Group I-3, under Section 308.4 of the International Building Code, covering buildings occupied by more than five persons under restraint or security. The section lists correctional centers, detention centers, jails, prerelease centers, prisons, and reformatories. Sections 308.4.1 through 308.4.5 then assign one of five conditions.

**What interior finish class does the code require in an I-3 building?** Table 803.13 in the 2018, 2021, and 2024 editions requires Class A in interior exit stairways, ramps, and exit passageways, Class A in corridors and exit access stairway enclosures, and Class B in rooms. Sprinklered and nonsprinklered requirements are identical here, and the 2015 edition numbered that table 803.11.

**Does K-13 reduce noise in a dayroom or gymnasium?** It absorbs sound within the space, which lowers reverberation and improves intelligibility of announcements and staff communication. Measured to ASTM C423, it reaches NRC 1.00 at 1.75 inches over solid backing and NRC 1.05 at 1.5 inches over 1.5-inch metal deck. Always state a thickness and a substrate.

**Does K-13 block sound between cells?** No. NRC describes absorption inside a room. Transmission between rooms is measured as STC and IIC, which are properties of a complete assembly rather than of a surface material. International Cellulose publishes no STC or IIC values for K-13, so an NRC number never converts into either.

**Can K-13 be applied in an occupied jail retrofit?** Yes, and it is common, but custody sets the schedule rather than the crew. Expect area shutdowns, escorts, tool control, and work windows built around count times, and a longer duration than the same square footage in an empty building.

**What does correctional insulation cost per square foot?** No credible published installed price exists for this work in this market, and any figure circulating as an industry number came from a lead-generation site. Height, access, deck profile, thickness, masking, and escort requirements all move it. It has to be bid.

## Key Takeaways

**Correctional insulation is a zoning decision before a product decision.**

- The Group I-3 condition and the reach line decide where a sprayed finish can go.
- Rooms where a person on fixed furniture can touch the ceiling go back to the architect.

**No detention security data exists for K-13.**

- International Cellulose publishes no tamper, vandal, pick, or ligature testing.
- Protek-13 over 1.75 inches tests NRC 0.95 against 1.00 uncoated, so abrasion protection costs absorption.

**The I-3 interior finish requirement does not relax with sprinklers.**

- Table 803.13 asks for Class A in exit enclosures and corridors and Class B in rooms, sprinklered or not.
- Class A under Section 803.1.2 is a flame spread index of 0 to 25 with a smoke developed index of 0 to 450.
- K-13 tested to ASTM E84 returns a flame spread index of 5 and a smoke developed index of 5, which are results and not a rating.

**Substrate moves the acoustics more than thickness does.**

- The same 1.5 inches reads NRC 0.90 on solid backing and 1.05 over 1.5-inch metal deck, and the solid-backing peak of 1.05 at 4 inches falls back to 1.00 at 5.
- NRC is absorption within a room and never converts to STC or IIC.

**The three states do not share a code clock.**

- Wichita is on the 2024 International Building Code while other jurisdictions adopt on their own schedules.
- The same requirement can be Table 803.13 in one county and Table 803.11 in the next.

If you are building or renovating a detention facility and you want a crew that asks for the Group I-3 condition before it asks for square footage, marks the reach line room by room, pulls the deck profile before quoting an NRC number, and keeps a tested score separate from a code class on the submittal, that is the correctional insulation work we do throughout Texas, Kansas, and Oklahoma. Call me at 512-387-2111 or email ross@bahlfireproofing.com to walk a set with us, or [Contact Bahl Fireproofing](https://bahlfireproofing.com/contact/) to get on the schedule. Our [K-13 sprayed fiber insulation](https://bahlfireproofing.com/k13-sprayed-fiber-insulation/) page covers the exposed-ceiling side of this work, and our [Bahl Fireproofing service areas](https://bahlfireproofing.com/service-areas/) page shows the territory we cover.

---

*This article provides general educational information about insulation, interior finish, and occupancy classification for correctional and detention buildings, and it is not engineering, legal, or code-compliance advice. It does not replace project-specific direction from a licensed architect or engineer. Product specifications including R-value, NRC, bond strength, density, and color availability are revised by manufacturers, so confirm current values against the latest data sheet before specifying. Code citations reference a specific edition, the adopted edition varies by authority having jurisdiction, and fire-resistance performance depends on the tested and listed assembly and correct installation. Security, tamper, contraband, and ligature determinations in inmate-accessible spaces belong to the licensed architect or engineer of record, the operator, and the authority having jurisdiction, and installation must follow the manufacturer’s written instructions and be performed by a licensed applicator.*

Written for Bahl Fireproofing**Ross Bahl, Owner**

Ross owns Bahl Fireproofing, the commercial fireproofing and insulation subcontractor his family started in 1977. Every code figure on this site is checked against the published source before it goes up. [More about Ross](/ross-bahl/).

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### [Parking Garage Insulation: Acoustic and Thermal Control for Multi-Level Structures](https://bahlfireproofing.com/parking-garage-insulation-acoustic-thermal/)

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### [Hospital Acoustic Insulation: K-13 Spray-Applied Solution for Patient Recovery](https://bahlfireproofing.com/hospital-acoustic-insulation-k-13-spray-applied-solution-for-patient-recovery/)

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