DOME PROFILE 1:4 – If we go to a 1:4 ratio, in this case a dome with a 150’ diameter and height of 37.5’, we have the least expensive roof to put over that much floor area. There is still enough height that for many buildings, there is walking space around the perimeter. The 1:4 profile gives you the most bang for your buck with the large surface area acting as a thermal battery.