---
title: "Core-Fill 500 Masonry Insulation | Bahl Fireproofing"
description: "Core-Fill 500 injected into the open cores of concrete masonry, in new walls and as a retrofit in standing block, with no demolition and no teardown."
url: "https://bahlfireproofing.com/core-fill-insulation/"
---

Core-Fill 500 foam-in-place masonry insulation

# Core-Fill
*Insulation*

Foam-in-place insulation for concrete block cores and masonry cavities. Injected through small holes in the mortar joints, set in about twenty seconds, no demolition.

[Send us your drawings](/contact/)What Core-Fill does and does not do

**Block walls, filled**Schools and gyms, churches, fire stations, warehouses and shops, municipal and agricultural buildings, and precast hollow-core panels. New masonry and standing walls both.

**Nothing gets torn open**Injected through small holes in the mortar joints and patched to match. No demolition, no interior finish removed, and the building usually stays in use while we work.

**Quieter block**Filled cores cut sound transfer through a masonry wall, which matters more in a gym, a corridor or a shared classroom wall than most specs give it credit for.

**An honest number on the bid**We quote the wall, not the foam, because the density of the block moves the R-value more than the insulation inside it does.

Core-Fill by Bahl

The block insulation that goes in
after the wall is up.

Core-Fill 500 is an amino-plast foam insulation manufactured by Tailored Chemical Products, Inc. of Hickory, North Carolina. It is injected into the open cores of concrete masonry units and into masonry cavities, where it expands to fill voids and sets in roughly twenty seconds under typical conditions.

Bahl installs Core-Fill in new masonry construction and as a retrofit in existing block walls: schools, churches, warehouses, precast hollow-core panels and commercial buildings where the wall is already standing and the energy bill says it is uninsulated.

Pending confirmation (decision 1.2): this page and its eleven blog posts assume Bahl sells and self-performs Core-Fill. New page, no existing copy to keep.

The material

## What Core-Fill does, and what it does not do

Block density moves the wall R-value more than the foam does. Same 8-inch unit, same foam: R-8.58 in 85 pcf lightweight block versus R-4.08 in 135 pcf normal-weight block. That 2.1x swing comes from the block, which is why manufacturer construction tables read high.

Core-Fill is a two-component amino-plast foam: resin plus a catalyst and foaming surfactant, mixed at the gun and injected into the cores. It fills the voids, it does not carry load, and it does not raise the fire rating of the wall. Those limits matter as much as the R-value.

### Wall R-values that account for thermal bridging through the block webs

Unit 85 pcf 95 pcf 105 pcf 115 pcf 125 pcf 135 pcf

6-inch foamed cores R-6.38 R-5.54 R-4.80 R-4.17 R-3.63 R-3.16

8-inch foamed cores R-8.58 R-7.40 R-6.38 R-5.49 R-4.73 R-4.08

10-inch foamed cores R-10.47 R-8.98 R-7.69 R-6.57 R-5.62 R-4.82

12-inch foamed cores R-12.99 R-11.10 R-9.47 R-8.07 R-6.87 R-5.86

Source: CMHA (formerly NCMA) TEK 06-02C, Table 2, series-parallel method. For compliance, point at the adopted energy code or ASHRAE 90.1 Appendix A, never at a manufacturer table. Foam R-value: R-4.5 per inch at 74F mean, R-4.9 at 32F mean, ASTM C518.

### Standing limitations, stated on every page

- Not for ceiling or attic applications; not for overhead work.
- Will not support compressive loads; not for flotation.
- Not above 190F sustained; not underground as a vapor barrier.
- Does not raise the fire rating of a concrete masonry unit. If the wall needs a rating, that is a different scope.

### Pricing a scope?

Send the drawings and the spec section. We return a number, not a range.

[512-387-2111](tel:512-387-2111)[Request a bid on this scope](/contact/)

> The block sets the R-value.
> *The foam finishes it.*

Density is the variable nobody prices. A lightweight 85 pcf block with foamed cores insulates twice as well as a normal-weight 135 pcf block with the same foam. We say that on the bid so the number is real.

CMHA TEK 06-02C, Table 2

How we install it

## How we install Core-Fill

01

### Survey

Block type, density, wall height and existing penetrations mapped; injection pattern set.

02

### Drill

Small holes in the mortar joints on the injection pattern; no demolition.

03

### Inject

Foam placed core by core from the bottom up, set in about twenty seconds.

04

### Verify fill

Overflow at the next hole up confirms the core is full; voids re-shot.

05

### Patch and document

Holes patched to match; coverage map and batch records handed over.

## Block walls, insulated after the fact

Tulsa, Oklahoma

### Dick's House of Sport

Multiple fireproofing products across the store, protecting the structural steel with fire-resistive systems installed to the listed design.

SFRM and intumescent

Celina, Texas

### Celina Fire Station No. 3

A working fire station, fireproofed by the crew whose trade it is. Exposed and concealed steel, installed to the specified ratings.

SFRM

Lubbock, Texas

### Kappa Kappa Gamma

Called in to make sure it was done right. We handled the full fireproofing scope on the building, start to finish.

SFRM

Melissa, Texas

### Melissa High School

Every beam and column in our scope got the specified system at the specified thickness, on a school schedule that doesn't move.

SFRM and intumescent

[All projects](/)

## Contact Us

Call, email, or send the drawings through the form. All three land in the same place, and Ross reads them.

Call us**[512-387-2111](tel:512-387-2111)**

Email us**[ross@bahlfireproofing.com](mailto:ross@bahlfireproofing.com)**

Working hours**Mon to Fri: 8am to 5pmWeekends: closed**

### Request a Core-Fill bid

## Core-Fill insulation by state

[**Texas** Austin, Dallas-Fort Worth, Houston, San Antonio, Lubbock Core-Fill insulation in Texas →](/texas/)[**Oklahoma** Oklahoma City, Tulsa Core-Fill insulation in Oklahoma →](/oklahoma/)[**Kansas** Wichita, Kansas City metro, Hays Core-Fill insulation in Kansas →](/kansas/)[**Arizona** Phoenix, Tucson Core-Fill insulation in Arizona →](/arizona/)[**Minnesota** Minneapolis, St. Paul, Rochester, Duluth, Brainerd, Walker, Bemidji Core-Fill insulation in Minnesota →](/minnesota/)[**Wisconsin** Milwaukee, Madison, Green Bay, Superior Core-Fill insulation in Wisconsin →](/wisconsin/)

## Core-Fill FAQ

Does Core-Fill raise the fire rating of my block wall?

No. The manufacturer states it is not intended and should never be used to increase the fire rating of a concrete masonry unit. It insulates; it does not rate.

Can it go in an existing building?

Yes. Retrofit of standing CMU walls is one of the four applications the manufacturer lists, alongside block insulation, masonry cavity fill and precast hollow-core panels.

What R-value will my wall have?

It depends on the block density more than the foam. The TEK 06-02C table above is the honest answer; the manufacturer construction table overstates it because it ignores the webs.

Is there an ICC-ES report?

None could be located as of August 2026, so we do not cite one.

What kinds of buildings use Core-Fill?

Anything built out of block. Schools and gyms, churches, fire stations, warehouses and shops, correctional and municipal buildings, agricultural structures, and precast hollow-core panels. New masonry and standing walls both.

How disruptive is it in an existing building?

Small injection holes go in the mortar joints and get patched to match. No demolition, no wall opened up, no interior finish removed. Most retrofits happen from the exterior while the building stays in use.

Does it settle over time?

It cures in place as a rigid cellular foam rather than sitting loose in the cavity, so it does not slump the way poured or blown loose fill can. That is most of the reason it gets specified for retrofit.

How much wall can you fill in a day?

Enough that it is rarely the schedule driver. The pour is fast; access, staging and weather are what set the duration. We give a real production rate with the bid once we see elevations.

## From the Bahl library

[Guide ### Core-Fill 500 masonry insulation: the guide *Read the guide →*](/blog/)[Install ### Core-Fill installation in concrete block walls *Read the guide →*](/blog/)[Retrofit ### CMU retrofit with Core-Fill 500 in existing buildings *Read the guide →*](/blog/)[Compare ### Rigid foam board vs Core-Fill 500 in the masonry cavity *Read the guide →*](/blog/)

This page describes Bahl Fireproofing's scope of work and general code context. Requirements, adopted code editions and inspection procedures vary by jurisdiction and project; confirm them with your licensed architect or engineer and the authority having jurisdiction. Nothing here is a warranty of a building's compliance or a substitute for the approved construction documents.

```json
{"@context":"https:\/\/schema.org","@graph":[{"@type":"Service","@id":"https:\/\/bahlfireproofing.com\/core-fill-insulation\/#industry","name":" Fireproofing","url":"https:\/\/bahlfireproofing.com\/core-fill-insulation\/","serviceType":"Commercial Fireproofing","provider":{"@id":"https:\/\/bahlfireproofing.com\/#organization"},"areaServed":[{"@type":"State","name":"Texas"},{"@type":"State","name":"Oklahoma"},{"@type":"State","name":"Kansas"},{"@type":"State","name":"Arizona"},{"@type":"State","name":"Wisconsin"},{"@type":"State","name":"Minnesota"},{"@type":"State","name":"Nebraska"}],"isRelatedTo":[{"@type":"Service","name":"Intumescent Fireproofing","url":"https:\/\/bahlfireproofing.com\/intumescent-fireproofing\/"},{"@type":"Service","name":"Spray-Applied Fireproofing","url":"https:\/\/bahlfireproofing.com\/fireproofing\/"},{"@type":"Service","name":"Cementitious Fireproofing","url":"https:\/\/bahlfireproofing.com\/cementitious-fireproofing\/"}]},{"@type":["Person","Organization"],"@id":"https:\/\/bahlfireproofing.com\/#person","name":"Bahl Fireproofing","sameAs":["https:\/\/network.procore.com\/p\/bahl-fireproofing-llc-round-rock","https:\/\/subcontractorsaustintexas.com\/company\/bahl-fireproofing-llc\/","https:\/\/www.yelp.com\/biz\/bahl-fireproofing-round-rock","https:\/\/www.buzzfile.com\/business\/Bahl-Fireproofing-LLC-512-387-2111","https:\/\/subcontractorsaustintexas.com\/company\/bahl-fireproofing-llc\/","https:\/\/members.asaonline.com\/directory\/Details\/bahl-fireproofing-llc-2594032","https:\/\/www.osha.gov\/ords\/imis\/establishment.inspection_detail?id=303410971","https:\/\/www.manta.com\/c\/mm70y4c\/bahl-fireproofing-inc","https:\/\/www.nfca-online.org\/index.php?option=com_community&view=profile&userid=2018789809&module=view-all&uuid=f0c1d73b-33e3-4f07-bc9a-acef2520da51&current_page=0&directory_search_id=2006651#\/profile"],"logo":{"@type":"ImageObject","@id":"https:\/\/bahlfireproofing.com\/#logo","url":"https:\/\/bahlfireproofing.com\/wp-content\/uploads\/2025\/02\/7ae06-be6a6e71-7409-4c8c-bc8b-c64bc18f6b39-removebg-preview.png","contentUrl":"https:\/\/bahlfireproofing.com\/wp-content\/uploads\/2025\/02\/7ae06-be6a6e71-7409-4c8c-bc8b-c64bc18f6b39-removebg-preview.png","caption":"Bahl Fireproofing","inLanguage":"en-US","width":"312","height":"59"},"image":{"@type":"ImageObject","@id":"https:\/\/bahlfireproofing.com\/#logo","url":"https:\/\/bahlfireproofing.com\/wp-content\/uploads\/2025\/02\/7ae06-be6a6e71-7409-4c8c-bc8b-c64bc18f6b39-removebg-preview.png","contentUrl":"https:\/\/bahlfireproofing.com\/wp-content\/uploads\/2025\/02\/7ae06-be6a6e71-7409-4c8c-bc8b-c64bc18f6b39-removebg-preview.png","caption":"Bahl Fireproofing","inLanguage":"en-US","width":"312","height":"59"}},{"@type":"WebSite","@id":"https:\/\/bahlfireproofing.com\/#website","url":"https:\/\/bahlfireproofing.com","name":"Bahl Fireproofing","alternateName":"Bahl Fireproofing LLC","publisher":{"@id":"https:\/\/bahlfireproofing.com\/#person"},"inLanguage":"en-US"},{"@type":"ImageObject","@id":"https:\/\/bahlfireproofing.com\/wp-content\/uploads\/2025\/02\/db70d-img_3057-min-1024x768-1.jpeg","url":"https:\/\/bahlfireproofing.com\/wp-content\/uploads\/2025\/02\/db70d-img_3057-min-1024x768-1.jpeg","width":"1024","height":"768","caption":"Spray Foam Insulation Bahl Fireproofing","inLanguage":"en-US"},{"@type":"BreadcrumbList","@id":"https:\/\/bahlfireproofing.com\/core-fill-insulation\/#breadcrumb","itemListElement":[{"@type":"ListItem","position":"1","item":{"@id":"https:\/\/bahlfireproofing.com","name":"Home"}},{"@type":"ListItem","position":"2","item":{"@id":"https:\/\/bahlfireproofing.com\/core-fill-insulation\/","name":"Core-Fill Masonry Insulation"}}]},{"@type":"WebPage","@id":"https:\/\/bahlfireproofing.com\/core-fill-insulation\/#webpage","url":"https:\/\/bahlfireproofing.com\/core-fill-insulation\/","name":"Core-Fill 500 Masonry Insulation | Bahl Fireproofing","datePublished":"2026-09-06T13:59:59-05:00","dateModified":"2026-09-06T20:48:25-05:00","isPartOf":{"@id":"https:\/\/bahlfireproofing.com\/#website"},"primaryImageOfPage":{"@id":"https:\/\/bahlfireproofing.com\/wp-content\/uploads\/2025\/02\/db70d-img_3057-min-1024x768-1.jpeg"},"inLanguage":"en-US","breadcrumb":{"@id":"https:\/\/bahlfireproofing.com\/core-fill-insulation\/#breadcrumb"}}]}
```