Bunker Protection
Keep your radios, backup power, and communications gear working when the grid goes down for good.
Where Shielding Fails
A rushed or under-scoped shielding job leaves specific, predictable failure points. Here is where they appear and how a correct installation avoids them.
Reinforced concrete provides structural strength but zero electromagnetic attenuation, rebar is not a Faraday cage.
Welded steel plate or copper mesh bonded at every seam creates the continuous conductive envelope that redirects electromagnetic energy.
A blast door without conductive gaskets leaves a gap at the frame that breaks the shielding envelope at its most-used point.
Conductive gaskets fitted to blast doors and hatches maintain full contact under compression, keeping the envelope intact every time the door closes.
A standard ventilation duct is an open RF pathway into the bunker, filters alone do not block electromagnetic frequencies.
Metal vent tubes sized to waveguide-beyond-cutoff geometry block RF frequencies by physics, not by a filter that can degrade or fail.
Any electrical conduit entering the bunker without point-of-entry treatment carries a conducted pulse directly to the electronics inside.
Surge protective devices and point-of-entry shielding on every conduit stop a conducted pulse before it reaches the equipment you are protecting.
Shielding Scope
A complete shielding project treats the conductive envelope and every penetration through it, walls alone are never the full answer.
Welded steel or copper mesh forms a continuous conductive envelope bonded at every seam, with ground continuity verified throughout the structure.
Conductive gaskets fitted to blast doors and access hatches maintain a sealed electromagnetic contact under repeated use and compression.
Ventilation shafts are fitted with waveguide-beyond-cutoff metal sections sized to block RF frequencies without restricting airflow.
Surge protective devices and point-of-entry shielding are installed at every electrical conduit penetration to stop conducted pulses at the boundary.
Isolation flanges and penetration filters treat plumbing entry points so water supply lines do not become a gap in the conductive envelope.
Post-installation RF leakage testing verifies shielding effectiveness in decibels of attenuation across the frequency range of concern.
A shielded room within the bunker for mission-critical gear.
Full conductive envelope treatment for an existing bunker build.
Shielding designed in from the start of a new bunker project.
Shielded cable paths that keep internal wiring inside the envelope.
Shielding Integrity
The openings in a bunker, doors, vents, conduits, plumbing, are where EMP shielding fails if they are not treated correctly.
A Faraday cage works by surrounding electronics with a continuous conductive envelope that redirects electromagnetic energy around the protected space. Concrete and rebar do not form that envelope. Effective shielding requires welded steel plate or copper mesh bonded at every seam, with verified ground continuity throughout. The shielding effectiveness of the envelope is measured in decibels of attenuation, a meaningful specification, not a marketing claim.
Every opening is a potential failure point. Blast doors and hatches need conductive gaskets that maintain contact under compression. Ventilation shafts require waveguide-beyond-cutoff sections, metal tubes sized so their geometry blocks RF frequencies rather than relying on a filter. Electrical conduit entry points need surge protective devices and point-of-entry shielding. Plumbing penetrations require isolation flanges. On remote Montana ranches where backup radios, generators, and communications gear are the only link to the outside, a gap at any one of these points defeats the whole system.
After installation, RF leakage testing verifies shielding effectiveness across the frequency range of concern. The whole-bunker vs. shielded-room decision is a scope question: a full Faraday bunker protects everything inside; a shielded enclosure within the bunker protects specific electronics at lower cost. Both approaches are valid depending on what equipment needs protection and how much of the bunker volume is involved. That decision is made during the scope review, before any materials are ordered.
Why Choose Us
Shielding a bunker correctly means scoping every penetration before a single material is ordered. Here is how we make that happen.
Every enquiry gets a scope review covering site access, soil conditions, and shielding requirements before it moves to a quote.
Doors, vents, conduits, and plumbing are each flagged in the scope review so no entry point is missed in the quote.
The quote breaks excavation, structure, and shielding into separate line items so you see exactly what each phase costs.
Remote access routes, off-grid power infrastructure, and long distances from utilities are factored into the scope before work begins.
We scope both approaches and quote whichever fits your equipment list and budget.
We take your enquiry and scope it through to installation and post-install RF leakage testing.
The Process
01
Tell us the parcel, the bunker type, and the electronics you need to protect so we can frame the shielding scope accurately.
02
We review site access, penetration points, and the whole-bunker vs. shielded-room decision before your enquiry moves to a quote.
03
The quote covers each phase separately and plans RF leakage testing at completion so shielding effectiveness is verified, not assumed.
Pricing Estimates
| Job | Typical cost |
|---|---|
| Shielded door or hatch upgrade | $5,000-$15,000 |
| Partial room shielding | $15,000-$40,000 |
| Full bunker EMP shielding package | $35,000-$60,000 |
Tell us the parcel, the bunker type, and the electronics you need to protect. We review the scope and move it to a quote, each phase separate.