Hub kits that turn store-bought 2×4s into a geodesic dome — up to 24 feet wide and 424 square feet. Steel or PVC. You bring the lumber, a drill, and a weekend.
Same proven dome geometry, three hub systems. Pick by budget and duty — every one uses the same connection philosophy: seat the strut, don't just touch it.
The integrated heavyweight. Fewest parts, stiffest node — every tab is one piece of steel with the core.
Plate hub kits →
The modular steel. Same through-bolts, flat-stack shipping, any part replaceable for the cost of one strap.
Strap+ring kits →
The proven original, back in production. Lighter, cheaper, screw-together simple — and 9 years of Texas on its résumé.
PVC kits →Most budget hub kits hold each strut with a single thin tab and a couple of screws into one face of the lumber. Ours give every load its own path: steel tabs and straps take ½″ through-bolts clean through the 2×4; PVC struts seat inside a molded socket that bears the compression directly, with the disc screws only ever loaded in shear. The strut can't lever, twist, or pull a screw out of one face, because no single screw is doing all the work.
A 3V dome wants four slightly different strut angles at every hub. We bend every steel tab to one universal angle and absorb the difference deliberately: the outer bolt rides in a lateral slot, the inner hole is oversized for bolt tilt. Worst-case angular error is under 2° — well inside the designed slack. That's why the kit assembles with a wrench instead of a hammer.
Every steel kit — plate hub or strap+ring — ships with a bend-up drill jig that slips over the end of a 2×4 and guides every bolt hole, all 330 patterns on a 3V dome. PVC kits need no jig at all: seat the strut, drive three deck screws. Either way, you never measure a bolt hole.
Proof-load figure from a single-strut dead-load test on the original proof structure; informational, not an engineering certification. Read the proof dome story →
Sold and supported for agricultural, greenhouse, garden, and glamping structures. Here's where each kit shines.
The classic. Film or twin-wall poly over the frame; the dome shape sheds wind and maximizes light angles year-round. Any kit — PVC keeps the budget for soil and glazing; 424 ft² at 3V is a serious market garden.
Canvas or vinyl skin, deck platform, done — the look guests photograph. 2V or 3V steel if it stays up year-round and hosts hammocks and hanging chairs; PVC for seasonal setups that pack away.
Chicken runs, kidding shelters, hay and equipment cover. 1V kits go up solo in an afternoon; choose galvanized steel where animals breathe on the frame all winter. Ag exemptions often apply — verify locally.
Shade cloth or climbing vines on a bare frame — the dome as trellis. Galvanized steel, screws-only fastening level, zero maintenance. The frame is the architecture.
Pottery studio, wood shop, gear storage — a shelled 3V steel dome with the back-plate set is a serious non-dwelling outbuilding. Our proof dome's latex concrete shell method takes it weathertight.
We don't sell dwelling kits, and nothing on this site is an engineering certification. If your project needs stamped drawings, hire an engineer — we'll send DXFs and dimensions the same day you ask. What owner-builders do with their own diligence on their own land is their business.
Frequency is dome density: more struts, more triangles, bigger and stronger dome. Every frequency is available in steel or PVC.
Greenhouse, chicken run, garden feature, first dome.
Serious greenhouse, glamping shell, studio shade frame.
The flagship. Flat-base Kruschke geometry — all 15 base hubs sit dead level on your pad.
Before we sold a single hub, this design carried a 460-square-foot dome through nine years of central Texas heat, hail, and wind — finished with a latex concrete shell and load-tested at 400 lb on a single strut.
We didn't invent this joint in a CAD program last spring. It's our founder's backyard theater room — nine years of daily use on nothing but repainting and basic maintenance — and we put its hubs back into production when nobody else would.
The proof dome story
2×4s, deck screws or bolts, and one of our kits. That's the whole bill of materials.