How to Attach an Airform

Reprinted from Summer 1998 Roundup
Updated July 18, 2007

Bend Rebar

The Airform is a highly engineered fabric structure that should be handled with great care. Many factors enter into its attachment to the concrete foundation.

Lay Supplies on Floor

Make sure the rebar is bent over the footing to avoid tearing the Airform during inflation. Place supplies or tools that cannot be taken through the Airlock within the foundation area and cover.

For single domes, the Airform is rolled up with the air lock and the air tube at bottom center. Therefore, the Airform should be placed at the location of the Airlock before proceeding to unroll it. For multi-dome Airforms, a layout diagram should be included. Proceed to unroll the Airform toward the center and unfold.

Roll Open Airform

Carefully measure the circumference of the footing. Make sure the edge of the Airform is evenly spaced around the footing. This can be done by dividing the circumference of the footing by the number of seams and marking these seam points on the foundation. Then match up the seams with the marks on the footing.

Unroll Last Fold

The Airform should be laid out over the foundation. The entire circumference of the foundation may be covered before any clamp straps are bolted on. This is to permit any adjustment of the alignment of the Airform to the foundation that may be necessary. Be sure you attach the Airform on one side, then it's opposite. Then attach the quarter points, and their opposites and continue evenly all the way around. Always match the gore points. (If you start at one place and go all the way around, you will be wrong almost every time). For Domes with augments set the edges of the augments first and then fill in. The Airform will stretch to fit the foundation if you meet the individual points.

Attach Airform

The rope in the bottom of the Airform should be pushed down three inches. The clamp straps are placed about the rope and secured by the concrete bolts and screws. Spacing of the fasteners should be 6" to 24" on center depending on pressure and type of fastener used. For small domes the spacing can be up to 24” on center (More is generally better than less).

Reach into Airform

For large domes the spacing should be 6” on center. The Tapcon fasteners are great for the domes. Also there are several other types that work well. For the large domes 150' or larger consider 3/8” or even 1/2” concrete anchors. The rope can be anchored with clamps but for large domes anchors are needed through the double fabric that holds the rope in place if clamps are used.

The Airlock is then attached to the appropriate opening. If for any reason your Airform fits the foundation loosely, then it is important you pull the slack to the center of the airlock and fold a tuck there, or at the center of a main opening like a double door.

Attach the Airlock

Once the Airform is in place, bolted down, and inspected, it can be inflated. Inflate in as little wind as possible and as rapidly as makes sense. Inspect the perimeter as the inflation is in progress. Watch for hang ups of the Airform.

Inflate Airform

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