The cubes

CUBE, CUBE 20
and CUBE HD.

Every CUBE Bunker is built from these pieces, welded and tested in West Point, Utah. Mix them in one bunker: they share the same portals and mate packages.

Build with them in 3D
CUBE: ribs outside, so the walls inside are flat. Shown on its drain-rock bed with helical anchors.
CUBE, per cube$35,500plus $12,000 interior finish; installed prices in northern Utah
Size10 x 10 ft outside, about 9 ft 4 in square inside, 8 ft finished ceiling
Steel1/4 in ASTM A572 Grade 50 plate, welded ribs outside
Coating40 mil polyurethane, spark tested, plus magnesium anodes
GroundDrained sites: groundwater stays below the floor
Cover2 to 4 ft of earth, people and lawn equipment on top
JoinsOn any side, with a mate package on each cube
CUBE 20: one welded 10 x 20 ft piece, portals on both ends, ten helical anchors.
CUBE 20, per piece$64,900plus $22,000 interior finish

Twice the room of a CUBE with no joint in the middle. Against two CUBEs joined end to end, the CUBE 20 saves $40,100 in the structure: one piece instead of two, no mate kit, and solid long walls instead of end caps.

Size10 x 20 ft outside, about 9 ft 4 in x 19 ft 4 in inside
Steel1/4 in A572 Grade 50, one-piece roof and floor plates
OpeningsPortals on both 10 ft ends; side portals on request ($3,500 each)
FreightTwo per truck
Best forBunk rooms for six to twelve, great rooms, long halls
Open a CUBE 20 in the Builder
CUBE HD: half-inch steel and heavy ribs, welded to an anchor kit cast into a concrete pad.
CUBE HDQuoted per projectAsk a dealer or Styrkholm for a quote
Steel1/2 in A572 Grade 50 plate, 13 heavy ribs per wall
GroundwaterDesigned to sit fully submerged, water up to the surface
Surface loadHeavy equipment over it at 3 ft of cover or more
Cover3 to 8 ft of earth
CoatingImmersion epoxy plus polyurea, about 100 mils
FoundationConcrete pad with a galvanized anchor kit
Ask for a CUBE HD quote

Inside the walls

Foam on steel.
Utilities through the joint.

Closed-cell foam is sprayed straight onto the steel, so warm air never touches a cold wall and nothing sweats. MgO board goes over it: it will not burn, mold or crack on the truck the way drywall does. Water, power and air pass between cubes through two ports in the portal frame, inside the joint seal, so no new holes are cut in the shell.

soilCoating 40 mil (100 mil HD)Steel plate 1/4 in (1/2 in HD)Closed-cell spray foam 1-1/2 in, R-10, bonded to steelSteel furring 1-1/2 in on welded studs (wiring drops)MgO board 1/2 in, listed thermal barrierFinish: paint, or Class A FRP in wet roomsService floor 4 in: steel sleepers, rigid foam,utility runs, 3/4 in MgO subfloor, vinylAbout 3-1/2 in per wall, inside the steel.Foam bonded to the plate leaves no air gap, so warm air never touches cold steel: no condensation.
Wall and floor build-up · about 3-1/2 in inside the steel
CUBE A interior (bath)CUBE B interior (hall / plumbing)42 in PORTALclear walkway, nothing in itmate collar + gasketLOW PORTHIGH PORTLow port: water supply, pumped gray water, power. High port: exhaust duct, data.Both sit in the portal frame inside the collar gasket; jumpers snap together on site.
Utilities at a mate joint · snap-together water, drain, power and air jumpers