In most cases you don't need a floor in your party tent, especially if you have a really nice lawn of grass - why cover that up? Sometimes you might want a floor other than grass for dancing on and flooring is available if needed. The best for a temporary floor is snap-lock floor with black or marble being the most common. Snap-lock floor works great on hard surfaces such as asphalt parking lots for display shows or any special event. For rough areas including grass, gravel or construction sites, plywood subfloor must be used.