BUNKERThe only room in your house engineered
to survive what the rest of it can't.
What Is a FEMA-Rated Safe Room
Not a reinforced closet. Not a basement corner. A FEMA P-361 safe room is a discrete concrete-and-steel structure engineered to a single specification: keep every person inside it alive when the rest of the house is gone.
| Parameter | Value | Standard |
|---|---|---|
| Wall Thickness | 6 in | reinforced concrete |
| Rebar Spacing | 12 in O.C. | #5 grade 60 steel |
| Anchor Bolts | 5/8 in | diameter, 12 in embedment |
| Door Rating | EF5 | 250 mph + 100 lb 2×4 debris |
| Ventilation | Dual-port | filtered, blast-rated |
| Occupancy | 6–10 | persons standard config |
A FEMA P-361 safe room is tested to withstand a 15-pound 2×4 board fired at 100 mph with zero penetration. Your interior walls will not pass this test.
Where It Goes in Your House
Three proven locations. Each has a different install profile, cost, and access window. Your site assessment determines which is optimal for your foundation type and family layout.
- No interior space lost
- Slab already poured — anchor direct
- Easy equipment access for install
- 48-hr install window typical
Requires 4″ minimum slab thickness. Most garage slabs qualify.
Our site assessment confirms slab thickness, soil bearing capacity, and utility conflicts before any commitment. Takes 45 minutes. No obligation.
What Happens During an EF5
Wind-load data presented without editorial. These are the numbers that define what your walls can and cannot survive. The Bunker is engineered to the last row.
| Category | Wind Speed | Bunker | ||
|---|---|---|---|---|
| EF0 Minor structural damage | 65–85 mph | 12–22 psf | Light debris | RATED |
| EF2 Significant structural damage | 111–135 mph | 77–113 psf | Roof decking, small lumber | RATED |
| EF4 Devastating — frame homes leveled | 166–200 mph | 171–248 psf | 2×4 @ 100 mph, vehicles | RATED |
| EF5 Incredible — total destruction | > 200 mph | > 248 psf | Vehicles, structural members | RATED |
Source: FEMA P-361 Table 3-1 · ASCE 7-22 Wind Load Standard · Texas Tech TTU WiSE Field Data
Download the Homeowner's Shelter Guide
48 pages. FEMA P-361 explained in plain language. Local wind zone data personalized to your zip code. Permit checklist. Insurance claim worksheet. Everything you need to make an informed decision.
- Wind zone map for your county
- Foundation compatibility checklist
- Insurance premium reduction worksheet
- FEMA P-361 compliance summary
How It's Installed
Permit to certification in 48 hours. No open foundation. No extended construction window. The precast method means your garage or closet is closed and functional before the weekend.
Permit & Site Prep
- →Building permit filed with municipality
- →Foundation core sample reviewed
- →Utility locate completed (811)
- →Equipment staging area marked
Foundation Pour
- →Anchor bolt template positioned on slab
- →5/8″ anchor bolts set in wet concrete
- →12″ embedment depth verified
- →Pour cured — 4-hour minimum before set
Unit Set & Seal
- →Precast concrete unit delivered by crane truck
- →Unit lowered onto anchor bolt pattern
- →Perimeter sealant applied (blast-rated)
- →Door hardware and vent ports installed
Inspection & Certification
- →Municipal inspector on-site sign-off
- →NSSA installation checklist completed
- →Torque spec verification on all anchor bolts
- →Homeowner walkthrough and certification packet
Permit to certified installation. No open foundation overnight. No extended construction disruption.
- Signed municipal inspection report
- NSSA installation certificate
- FEMA P-361 compliance letter
- Anchor bolt torque log
- Insurance documentation packet
What It Costs & What Insurance Gives Back
Transparent pricing. No hidden upgrade fees. And in tornado-prone states, most insurers reduce homeowner premiums 10–30% for a certified safe room — often making the math straightforward.
- Single steel door
- Single vent port
- Interior bench
- Garage slab install
- Dual steel door option
- Dual filtered vents
- Bench seating both walls
- Garage or closet install
- LED emergency lighting
- Full entry door + emergency egress
- HVAC stub-out
- Dedicated circuit
- All placement types
- Custom interior finish
Estimates based on NSSA insurance data. Actual savings vary by insurer and policy. Contact your carrier with your FEMA P-361 certification letter for exact quote.
Get Your Free Site Assessment
45 minutes. A Bunker technician confirms your slab thickness, identifies the optimal placement, and gives you an exact installation quote. No sales pressure. Just the numbers.