This is a photo of the 15 ft diameter dome with a 3 ft Vertical Base Option (VBO). The Base Option vertical intermediate struts give rigidity and structure for attaching rigid siding - board panels or greenhouse glazing. The Base is a good location for adding standard size windows. A rectangle door is retrofitted to the dome by removing parts and customizing for a standard door size.
Sizing up the dome: the 16 ft diameter dome is ideal for using cover panels made from 4 x 8 ft sheets efficiently with minimal waste. Plenty of room to walk around. Easy to build and easy to cover. One of our most popular domes. Make the VBO any convenient height.
This next photo shows the door retrofit area partially assembled on an 18 ft Octa Dome with a 4 ft. VBO. The door rough-in frame is 2 x 6. The rectangle door intersects with the dome triangles, faces remain intact (with a cutout for the door) for covering purposes, and a door entrance awning (not shown) is made to complete the entrance. The 18 ft size is ideal for maximum use of 8 ft lumber (longest strut is nearly 8 ft.). For covering with polycarbonate glazing, use the -X1 subdivision for attaching triangles made from the 6 ft wide polycarb. See building parameters
