|
David,
My brother and I built such an observatory for an elderly fellow in South Australia many years ago. His house had been extended with a 'parent's retreat' added as the second floor. The second floor room was about 4 metres across the short aspect and 8m long.
We ran two 12" steel I-Beams across the floor at one end of the large room.
These beams sat atop steel posts that went through the floor onto the ground floor slab. Six posts in all, 4 of which were located in wardrobes on the ground floor, two became 'Feature Columns' and were clad in gyprock.
We then installed a 2.7m x 4m false floor 300mm above the actual floor with 10mm isolation gap to the beams. The false was floor was carpeted as were the tops of the steel beams. Two smaller beams connected the larger ones and carried the pier. A polished redgum step ran the full width of the 4m room.
Someone else was going to be building a dome. I never went back to see if it was completed.
|