Extended augments are a great way to make openings in Monolithic Dome Structures. They are highly technical to pattern and build into the Airform, but fairly straightforward to frame and to finish. This blog entry aims to cover the fundamental techniques we use every day to frame and finish out these openings. We hope this will help customers find sub-contractors to bid on and complete work for them as well as empower clients to do it themselves.
Step by step in pictures
The concrete floor in dome structures can be poured before the dome is built or after. We prefer that there is a step on the floor where the framed wall is going to be.
Once the dome is built, and the floor is completed, framing of the entryway can commence. The first step is to take the airform and nail it to the face of the augment. The siding material will cover up this part, so fold it and fix it.
Use any nails or screws to fasten the Airform to the face. If there is plywood there, simple roof nails work well; if it’s solid concrete, use a Tapcon screw anchor or concrete nail.
The next step is the framing of the entry. First, glue down and anchor the baseboard to the concrete floor. This board should be pressure treated to help with potential moisture issues. Next, frame the opening to contain your desired doors and window sizes. We like to use Tapcon screw anchors to attach studs to the dome.
This is a close-up of the base board attached down to the concrete.
The top of the boards can be attached simply with a Tapcon anchor screwed in from the side.
Once the framing is done, install the siding. OSB, or ZIP board, works well.
Once the siding is done, there are multiple ways to give the opening the ultimate finish. One way is to use the EIFS stucco system to finish the entry.
For EIFS, we install the door or windows next and use the EIFS not only to finish the front but also to give it a trim.
When using EIFS, we like to install a bit of a ledge on top to help keep rainwater running down away from the face of the augment.
Another method is to use Hardie Board or wood siding to finish the entry like this homeowner did. They used wood siding on the face of the augment and EIFS to clean up the side edges.