Take a step up to The Sundance Series® TB-600 model, which offers upgraded features in a classic barn style building. Considering the 6″ galvanized steel floor joists at the bottom, the additional room overhead, and the “wraparound” 5-Year Limited Warranty, it’s no wonder why the TB-600 is so popular among our customers. The TB-600 features six-foot sidewalls, end wall door placement, and can accommodate popular options like double doors and overhead loft.