Super-Wal The Double Strut System
Most other dome companies offer 2×4 struts as standard or at best 2×6 as standard. Very few will even offer 2×8 as an option. Why? Probably because it’s easy and cheap. For them, that is.
We learned (several hundred domes ago) that a 2×6 dome is not enough.
When Natural Spaces was formed in 1978, we had learned from six years of dome building and the energy crisis that old building methods were not going to carry us into the 21st Century.
So, we invented the Super-Wal double strut system providing a true super insulated dome system.
We learned how to manufacture a 15″, 18″ or 21″ wide strut for the same price as our 2×10 strut. We learned how to produce and sell them for less money than our competitors 2×6 dome system.
Why do you need such a thick strut? To add more insulation and provide for wall cavity air ventilation.
Is there a maximum “R” value or a point of diminishing returns? The additional investment you are making in the Super-Wal is so small that you a get a fantastic return. If anyone can predict what the world energy picture will be like 10, 25 or 50 years from now, we’ll tell you exactly what the pay back is. Just think back 20 years ago. Now, don’t you want something more than a 2×6 dome?
We also made our Super-Wal system easy to erect. Being pre-assembled, you don’t have to go back and add anything or tighten or align anything.Once you pound the bolt in place, your framework is locked rigidly together. You erect your double-strut dome framework in one day in one operation.
49′ Mid-Profile – Brainerd, Minnesota (small 20′ dome – to be covered with concrete and buried under dirt)
Because we use safe, economical fiberglass batt insulation, we have developed standard Super-Wal sizes:
| Super-Wal | Insulation | Air space | R-value |
| 15″ | 6 1/4″ & 6 1/4″ | 2 1/2″ | 44 |
| 18″ | 8″ & 8″ | 2″ | 55 |
| 21″ | 9 1/2″ & 9 1/2″ | 2″ | 66 |
Two 6″ batts are cheaper than one 12″ batt. We notch our struts and set back our sleeve to allow airflow between panels.
Our Super-Wal double strut system is not a new, experimental system. We’ve been building it for years. It’s practical and economical to build. Best of all, it will save you thousands of dollars in your future fuel bills, providing you comfort of mind and body.