ArroDesign of Waitsfield, Vermont, recently completed construction on an all-concrete tree house.

In addition to traditional cardboard tubes, ArroDesign employed Fast-Tube column forms. Manufactured from high-strength fabric, Fast-Tube comes on rolls of 60 and 120 feet, and in diameters ranging from eight to 24 inches.

“We were able to pour 29-foot columns with a single form and obtained a beautiful textured finish,” says Sandy Lawton, president of ArroDesign.

To join the tree house with the main residence, the crew created a suspended, curved concrete walkway using both conventional forms and Fast-Tube column forms.