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Cast-in-place penetrations are openings and sleeves formed in concrete slabs or walls for pipes, conduits, cables, ducts, and other services. The reliable approach is to coordinate every penetration with the service layout and structural drawings before the pour, secure the selected sleeve or form, and then match the completed condition to a listed firestop and sealing system where the assembly is rated. If an opening is needed after placement, obtain a project-specific structural review before coring and design the annular-space seal at the same time.
There is no universal winner between pre-placed sleeves and post-pour core drilling. Pre-placement gives the team a coordinated, repeatable opening before concrete placement; coring preserves flexibility for late changes but adds scanning, structural, dust, access, and firestop coordination. Local adopted codes, the project specification, the structural design, and the exact firestop listing control the final detail.
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A cast-in-place penetration is a planned passage through concrete that is created as part of construction rather than cut randomly later. The opening may be made with a permanent sleeve, a removable form, a cast-in firestop device, or a formed opening. The penetrant is the item that eventually passes through it: for example, a pipe, conduit, cable bundle, or duct.
The concrete assembly still has to perform its intended structural, fire-resistance, smoke-control, water-resistance, and acoustic functions after the service is installed. A sleeve is therefore only one component of the detail. For a rated wall or floor, the tested system generally includes the rated assembly, the precise penetrant, the sleeve or device, and the firestop material or device. The International Code Council describes this combination as the firestop system; its guidance warns that cast-in devices are tested for particular penetrant types and sizes, not for every product that happens to fit through them (ICC guidance on common firestop code violations).
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Why must penetrations be coordinated before the concrete pour?
Pre-pour coordination prevents a service opening from colliding with reinforcement, beams, embeds, post-tensioning, edge distances, or another trade’s opening. It also gives the firestop installer a known geometry instead of an improvised hole with an unknown annular gap.
A practical coordination sequence is:
- List the services. Identify each pipe, conduit, cable tray, duct, drain, sleeve, insulation thickness, support, and future spare opening. Record the outside dimensions and material, not only the nominal trade size.
- Map the locations. Transfer the service coordinates, elevations, wall faces, slab edges, and required clearances to the coordinated structural and MEP drawings. Show openings on the same reference grid used for reinforcement and embeds.
- Classify the assembly. Mark whether each penetration is through a rated wall, rated floor or ceiling, smoke barrier, wet area, exterior envelope, or a non-rated assembly. The required seal depends on that classification.
- Select the opening method. Choose a sleeve, formed opening, cast-in firestop device, or an approved later core based on the penetrant, sequence, access, structural constraints, and sealing method.
- Obtain approvals. Resolve structural, architectural, fire-protection, plumbing, electrical, and waterproofing comments before issuing the pour drawing. A project specification may impose additional sleeve materials, dimensions, or inspection steps.
A New York City Department of Design and Construction specification illustrates the usual pre-placement expectation: sleeves are installed during erection of slabs and walls unless core-drilled holes or formed openings are used, and sleeve selection is coordinated with firestopping (NYC DDC sleeve-installation specification). That is evidence of one owner’s practice, not a rule for every jurisdiction.
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Use pre-placed sleeves when the service route can be coordinated in advance and the opening must be repeatable. Consider post-pour coring when the route is genuinely unknown or a change cannot wait for another pour, but treat the core as a new structural and firestop design task.
| Decision factor | Pre-placed sleeve or formed opening | Post-pour core drilling |
|---|---|---|
| Timing | Layout, supply, and securement must be complete before concrete placement. | Opening work moves after the concrete has cured sufficiently for the approved method. |
| Coordination | Requires early agreement among structural, MEP, architectural, firestop, and waterproofing trades. | Allows a late service decision, but the as-built structure and all existing services must be investigated first. |
| Structural risk | Reinforcement and embedded items can be coordinated before placement. | Drilling near reinforcement, beams, columns, joints, tendons, or other structural elements requires project-specific structural review; do not assume a slab is safe to drill. |
| Firestop geometry | The sleeve or device can be selected to match a listed system before the pour. | The core diameter, wall or floor thickness, penetrant, and annular space must be matched to a listed system after the opening exists. |
| Water and smoke control | Waterproofing collars, puddle flanges, smoke seals, and firestop details can be shown on the pour drawings. | Existing membranes and finishes may need repair, and the seal must be designed around the actual drilled surface. |
| Best fit | Repeated penetrations, known risers, congested service zones, and rated assemblies with predictable details. | Verified change orders, unforeseen routes, or locations where a coordinated pre-pour opening was not feasible. |
The comparison is professional guidance rather than a universal design rule. The ASPE discussion of sleeves versus core drilling emphasizes that project conditions determine the better method (ASPE Pipeline comparison).
What should a penetration schedule contain?
A penetration schedule turns a crowded coordination drawing into an installation and inspection record. At minimum, give every opening an identifier and include:
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- Grid location, wall or slab reference, elevation, and orientation.
- Assembly type and fire-resistance or smoke-control rating, if any.
- Penetrant description, material, outside diameter, insulation, jacket, and quantity.
- Sleeve or device material, internal diameter, length, wall thickness, and whether it remains in place.
- Required blockout or formed-opening dimensions and tolerances.
- Waterproofing, vapor, acoustic, smoke, and firestop requirements.
- Structural restrictions, reinforcement details, edge-distance requirements, and any engineer’s notes.
- Firestop system reference, listing number, manufacturer instructions, and permitted orientation.
- Responsible trade, inspection hold point, and status: coordinated, approved, installed, inspected, or as-built.
Use the actual service dimensions. A nominal pipe label does not account for insulation, couplings, flanges, cable grouping, or movement. Oversizing an opening can create an annular space that the selected listing does not permit; undersizing can force an unplanned field enlargement.
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Install the opening only after the coordinated location and the sealing strategy are approved. The following sequence keeps the sleeve from moving, filling with concrete, or becoming unusable.
- Verify the latest drawing. Check revision, grid, level, wall thickness, slab thickness, and the referenced firestop or waterproofing detail. Do not set a sleeve from an obsolete trade sketch.
- Inspect the sleeve or device. Confirm material, diameter, length, end condition, corrosion protection, cast-in accessories, and identification. Compare it with the listed system or project specification.
- Set the elevation and orientation. Position the sleeve so the service can be installed without forcing a bend or damaging the seal. Keep required clearance from reinforcement, joints, edges, and embedded items.
- Secure it to the assembly. Brace the sleeve or form against flotation, rotation, displacement, and concrete pressure. The cited 2022 California Building Code states, “Where sleeves are used, they shall be securely fastened to the assembly penetrated” (2022 California Building Code, Section 714).
- Protect the opening. Cap or plug the sleeve so concrete, grout, and debris cannot enter. Protect threads, water stops, and cast-in hardware from damage.
- Recheck before the pour. The superintendent or designated inspector should verify coordinates, dimensions, securement, reinforcement clearance, and the opening schedule at the pre-pour hold point.
- Recheck after stripping. Remove temporary forms, clean the sleeve, measure the as-built opening, and record any displacement. Do not conceal an opening that cannot accept the intended penetrant and listed seal.
How do you detail a fire-rated penetration?
Start with the listing, not with a generic tube of sealant. Identify the rated assembly, penetrant material and size, sleeve or device, annular-space limits, installation depth, backing or packing, and required firestop material. Then install exactly within the listing and the manufacturer’s instructions.
The ICC explains that a listed firestop system is a combination of the assembly, penetrating item, and firestop material or device. A PVC pipe passing through a cast-in device is not automatically acceptable merely because both products are described as “firestop.” The listing must specifically cover that PVC pipe, its dimensions, the device, and the assembly (ICC Building Safety Journal firestop code guidance).
For each rated penetration, document:
- The wall or floor assembly designation and rating.
- Penetrant type, size, insulation, and quantity.
- Sleeve or cast-in device type and dimensions.
- Permitted annular-space range and any required packing or backing.
- Firestop product, installation depth, tooling, and cure requirements.
- Whether the system is approved for the actual orientation, thickness, and exposure.
- Inspection evidence, photographs before concealment, and the installer or responsible trade.
Where a penetration also needs smoke, water, acoustic, or movement performance, coordinate those requirements with the firestop detail. A product that satisfies one function may not satisfy another, and adding an unlisted coating or collar can invalidate the tested configuration.
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What does the 2022 California code example say?
The 2022 California Building Code is a jurisdiction-specific example; the locally adopted code and amendments govern the project. Section 714 requires listed penetration firestop systems to be installed in accordance with their manufacturer’s instructions and listing criteria, and it addresses protection of spaces around the penetrant and sleeve.
The cited provisions include a narrow exception for certain steel, ferrous, or copper penetrants in concrete or masonry walls. The stated limits include a maximum 6-inch (152 mm) nominal diameter and a total opening area of 144 square inches (0.0929 m²). Section 714.4.1.2 describes test requirements that include a minimum positive pressure differential of 0.01 inch (2.49 Pa). Those figures do not authorize every sleeve, penetrant, wall, or floor assembly; confirm the exact conditions and any adopted amendments before relying on them.
For fire-resistance-rated walls, the code example provides routes involving an approved system tested in the assembly or an approved through-penetration firestop system tested to ASTM E814 or UL 1479. The applicable rating, exceptions, and assembly limitations depend on the adopted code and the construction being penetrated.
What changes when the opening is cored after concrete placement?
Post-pour coring begins with investigation, not a drill. The structural engineer or delegated design professional should review the proposed location, and the team should locate reinforcement, tendons, embeds, conduits, and other concealed services using the project-approved methods.
- Confirm authorization. Obtain the change order, structural review, and owner or architect approval required by the project.
- Survey the location. Compare field conditions with structural and MEP as-builts, then scan for reinforcement, post-tensioning, embedded conduits, and piping. Mark the permitted core boundary.
- Choose the diameter from the seal detail. The core size must accommodate the penetrant while remaining inside the selected firestop or waterproofing listing.
- Control the work area. Plan slurry collection, dust control, access, noise, electrical safety, and protection of occupied spaces. Keep cut pieces from falling into voids or active areas.
- Inspect the finished core. Measure diameter, depth, wall or slab thickness, edge distances, and damage. Repair unsound concrete as directed before installing the service.
- Install the listed seal. Record the actual penetrant and annular gap; if the field condition differs from the listing, stop and obtain an approved alternative rather than improvising.
- Update the record drawings. Show the final coordinates, dimensions, service, structural approval, and firestop system.
Which cast-in firestop devices can be specified?
A cast-in device can simplify repeated rated penetrations when its listing matches the project condition. For example, Hilti describes the CP 680-P as a cast-in firestop sleeve for concrete floor assemblies rated up to four hours (manufacturer product information). “Up to four hours” is the manufacturer’s stated capability for specified concrete floor assemblies, not a blanket approval for every penetrant, thickness, orientation, or jurisdiction.
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Before naming that or any equivalent device in a submittal, verify the current listing, permitted penetrant materials and sizes, concrete assembly, sleeve dimensions, installation sequence, and compatibility with waterproofing and smoke-control details. Keep the listing and installation instructions with the approved penetration schedule.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What are the most common field failures?
- Wrong penetrant in a listed device. A device listed for one pipe material is used for another. Fix: compare the actual penetrant and size with the listing before installation.
- Sleeve movement during placement. The opening shifts, fills with concrete, or loses its required elevation. Fix: brace and cap it, then inspect at the pre-pour hold point.
- Unapproved oversized annular space. The service is smaller than planned and the gap exceeds the tested range. Fix: select a system that permits the measured gap or obtain a listed alternative.
- Coring through structural elements without review. Reinforcement or tendons are damaged, or the opening weakens the member. Fix: stop work, obtain structural direction, and repair only under an approved detail.
- Sealant chosen by category alone. A generic “fire-rated” sealant is used without the assembly and penetrant listing. Fix: identify the complete tested system and follow its installation instructions.
- Waterproofing ignored. A sleeve through a wet deck or below-grade wall lacks the required water stop or membrane transition. Fix: coordinate the waterproofing detail before the pour or before coring.
- As-built records omitted. Future trades cannot locate sleeves or distinguish rated from non-rated openings. Fix: photograph and schedule every concealed penetration before finishes close the area.
How should the team inspect and hand over penetrations?
Use a hold-point checklist rather than relying on a visual sweep at the end of the project.
- Opening identifier and coordinates match the latest coordinated drawing.
- Sleeve, form, or device is the approved type and is securely fastened.
- Concrete placement did not deform, clog, or displace the opening.
- Penetrant material, size, insulation, and quantity match the firestop listing.
- Measured annular space, assembly thickness, and orientation are within the listing.
- Firestop, smoke, water, and acoustic seals are installed at the specified depth and sequence.
- Required labels, collars, backing, packing, or supports are present.
- Photographs show the condition before concealment, and inspection records identify the installer and date.
- Any deviation has a written design clarification or approved alternate system.
- Record drawings show final sleeve and core locations, dimensions, and service contents.
This record protects later maintenance work. When a new cable or pipe is proposed, the team can see whether an existing sleeve is spare, rated, waterproofed, or already at its permitted capacity.
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Choose a pre-placed sleeve or formed opening when the service is known, the route can be coordinated, and the opening benefits from a repeatable listed detail. Choose coring only when the late opening has a documented structural path and a sealing system that fits the actual field condition. In both cases, the decisive question is not “Does the service fit?” but “Does this exact assembly, penetrant, opening, and firestop configuration have an approved path?”
When the answer is uncertain, stop before concrete placement or drilling, obtain the responsible designer’s direction, and revise the penetration schedule. That short coordination step is normally less disruptive than repairing reinforcement, waterproofing, fire-resistance, or concealed finishes after an unplanned opening fails inspection.
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Frequently Asked Questions
Can a sleeve be left empty for a future service?
Only if the project documents and the selected system permit an empty or spare sleeve condition. Keep the sleeve capped, identify it on the record drawings, and confirm how the eventual penetrant and annular space will be firestopped and waterproofed; a future service may require a different listed detail.
Who approves a new core in a structural slab?
The project’s structural engineer or other formally delegated design professional should review the proposed location and method under the contract requirements. The contractor should also obtain owner, architect, and fire-protection approvals where required, then update the as-built drawings.
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Does a firestop collar replace the need for a sleeve?
Not automatically. A collar, sleeve, sealant, or cast-in device is acceptable only as part of a listed system that covers the actual penetrant, assembly, dimensions, and orientation. Follow the listing rather than combining products from different systems.
How can inspectors tell whether a penetration was installed correctly?
They should compare the measured field condition with the approved listing and penetration schedule, not judge the seal by appearance alone. Useful evidence includes product identification, installation photographs before concealment, annular-gap measurements, installer records, and the code or design approval for any deviation.
