Using bevel-miter "T boards" to add the Perpendicular Bisector struts (blue) without using the -X1 Connector Hub modifications.

Use 15 4ft x 8ft sheets to make 30 right triangles to cover the dome. T boards or -X1 struts also help support the film, screen or other covering on larger Icosa Domes such as this one illustrated with 8' x 8' x 8' triangles.
Here the top is shown covered, with an 8" extension overhang.

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Icosa Dome


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