During the designing of a residence for Mr. and Mrs. John Cowles, of Naples, Florida, it was decided to investigate all means of economy associated with present concrete construction methods, including lift-slab, precasting, and thin-shell design, it was decided that the individual economies of these methods might successfully be combined into one new and more economical type of construction. This resulted in the development of the principle of site precasting sections of a folded slab design on a ground form and lifting them into place. The building was designed in the shape of an octagon, incorporating 8 separate gables, each engineered as a folded slab. The first three sections which were cast employed concrete inserts. Due to the difficulty of holding these inserts in place during casting, one-half inch steel plates, threaded to receive three-fourths of an inch bolts from the lifting apparatus, were substituted for the remaining sections. The edge of each section was cast in a key to accommodate a 1 and one-half of an inch grouted joint at each valley. Each slab was cast 3 feet short of the total radius dimensions of the roof, to allow for a 6 foot octagonal skylight. After the sections were erected a reinforced concrete tension curb was poured around the skylight, receiving three No. 5 bars turned up from each of the 8 slabs. The slabs rested directly on 6 inch lally columns with 12 by 12 inch bearing plates at the top. A spacer block 1 and one-half of an inch wide was placed on top of each of the bearing plates to prevent the adjoining section edges form compressing by contact. Around the 8 exterior columns a peripheral 1 inch tie-rod with a turnbuckle at each bay was employed. The turnbuckles allowed plumbing of columns, and were welded after all slabs were in place. Prior to erection of the slabs temporary X-bracing and 6 by 6 inch wood columns were used beneath the ridge of each section to lessen the initial thrust to the columns before the adjoining slabs were set in place.