ICD 705 Design and Construction Essentials for Secure Facility Projects

Designing a secure government room is totally different from designing a standard commercial office room. Designing a Sensitive Compartmented Information Facility (SCIF) the same way you would a typical tenant improvement would keep the project from moving forward, cause financial issues, and lead to a failed final accreditation. Secure space design needs total control of the perimeter. Every element of the room can be a line of defense to prevent visual observation, forced entry, voice eavesdropping, and gathering of signals and information.

Getting a fully accredited space is not a complicated process. It's about understanding the ICD 705 Design and Construction directives. If you're a company building a classified conference room or a contractor performing a large defense service, getting a successful outcome is about early cooperation, careful selection of ICD 705 compliant HVAC materials, and attention to detail.

Wall Layouts and Acoustic Barriers

A SCIF is an uninterrupted physical shell. The perimeter runs continuously from the structural concrete floor slab all the way up to the true underside of the concrete deck above. 

Standard commercial drop ceilings or raised computer floors offer zero security. If an unauthorized person can crawl over a drywall partition through a drop-ceiling plenum, your perimeter is compromised.

Stopping Sound Leaks

Physical walls have a job of containing sound intelligence from leaking out. Building requirements usually address two basic sound criteria at the acoustic baseline level.

• Sound Group 3 (STC 45 or better): Use within general secure areas where voice privacy is necessary.

• Sound Group 4 (STC 50 or better): Required for spaces where classified discussions occur regularly.

Reaching STC 50 takes more than just slapping on thick drywall. It requires staggered metal stud framing, high-density acoustic insulation, multiple layers of fire-rated gypsum board, and fully non-hardening acoustic sealants at every single joint, perimeter intersection, and floor plate.

Signal Shielding and Utility Treatments

Many metal utilities will act as unintentional conductive antennas. Internal pieces of copper pipe, an empty conduit, or an HVAC duct running through a secure wall can act as emitting antennas through which internal radio frequency (RF) emissions or audio vibrations can be transmitted to a non-secure area or an unsecured hallway.

An ICD 705 refrigerant line break interrupts this conductive path so that metallic piping serving your heating and cooling equipment cannot accidentally bridge signals across the secure perimeter.

Isolating Penetrations

To avoid penetrations from disrupting security:

Dielectric Isolation Breaks: These non-conductive couplers break the path of stray electronic signals by isolating metallic piping.

Z-Ducts & Acoustic Baffles: Mechanical Ductwork and Acoustically Lined. The z-ducts are designed to absorb sound, not transmit sound through the duct.

Waveguides Beyond Cutoff: Any air vent or open passage larger than a few inches requires an engineered metal honeycomb matrix that passes air but traps high-frequency electromagnetic energy.

SCIF Mechanical Penetrations: Steel security bars or grilles welded inside the ductwork prevent physical access thru larger air openings.

RF Shielded Piping Penetration: Special ground straps, dielectric breaks, and conductive seals prevent utility conduits from breaking the room's electromagnetic shield.

These designs must be properly executed using ICD-705 compliance and specialized SCIF HVAC components engineered to the project’s demanding physical footprint and TEMPEST requirements.

The Roadmap to Accreditation

Acquiring accreditation is a lengthy, progressive process. Approval is only given by a particular Accrediting Official (AO) when the AO has the opportunity to review each of the project documentation, evidence of construction, and logs of all technical experiments.

Step 1: Concept & Design Alignment

Assign a Site Security Manager (SSM) and obtain project funding. Introduce the project to the Accrediting Official (AO) and Certified TEMPEST Technical Authority (CTTA). Then preliminarily draw up some site plans with minimum utility crossings in the perimeter. Finally, list preliminary design constraints for SCIFs based on the intended use (discussion versus storage).

Step 2: Pre-Construction Clearance

Draft the first version of the fixed facility checklist (FFC). Look at the different parts of a Construction Security Plan (CSP): worker screening, tool control, site surveillance, etc.

All mechanical drawings shall be checked and accepted in writing by CTTA and shall comply with TEMPEST requirements. Make sure that the design is approved before acquiring any special material or before starting work at site.

Step 3: Construction & Work- Hidden Inspection

Strict site access will be implemented thru badging and logging of all visitors and construction workforce at all perimeter access points of the construction site. Install RF-shielded piping assemblies and dielectric isolation breaks at each utility crossing.

Photographs shall be taken of all structural, sound-deadening, ductwork, and electrical system components before these are covered by drywall as part of hold-point inspections. All field modifications, substitutions, and repairs must be recorded in the project’s central binder.

Step 4: Testing & Final Closeout

Check STC ratings of the acoustic perimeter and test doors, ducts, walls, and Intrusion Detection Systems (IDS) for access control.

Complete and prepare final, accurate built drawings with all necessary paperwork. Then look for the final inspections, collect logging photos, and the FFC package. Request the AO for the final walk-through of the site for the signed accreditation letter.

Executing Your Secure Build with Confidence

Planning and total material compliance are a must for successful completion of an ICD 705 project. Skipping dielectric breaks on utility lines and using non-certified duct fittings leads to expensive delays and failed inspections.

Use proven security managers early on and coordinate with your AO. Specify COTS (commercially available off-the-shelf) security components that interface with custom-designed and custom engineered HVAC components for secure facility projects.