Making some progress covering the dome with poly iso board. This is a 2V dome, 17ft in diameter, which is what i typically build because the longest struts are 5ft long.
The insulation board usage was really efficient. I cut the board in thirds (lengthwise) and then cut each of those in diagonal. These pieces were taped together.
To get the triangle to fit in the panel, i first cut about one inch off the top. Then i placed the panel in place on the dome to mark how much of the bottom i need to cut off. This varied from 1.75 inch to just 1 inch.
The PVC pipe is one inch and insulation board is 1inch so it sits flush with the pipe. I make further adjustments by cutting off the bottom corners to get the bottom passwd the hubs. Then i tape it in place.
I plan on making a more detailed video once I complete the dome, but here is a link to a youtube video of just the top as it was covered in the mean time.
Let me know what you think....