Our Large Tents (up to 35' x 64') also use 12oz tension membrane cover in conjunction with heavier 14 gauge galvanized 2 5/8" steel arches.
If you need a larger structure enginneered for the wind and snow loads and meets the Canada Building Code, please go to MegaDomeNL.com.
Imagine the Possibilities! 
Roof Colour: White or Green
Can be delivered an installed directly on your site and easily moved anytime!