Abstract: An expansion roof for connecting two roofs adjacent thereto, includes a first pair of hip rafters associated with a first one of said adjacent roofs and a second pair of hip rafters associated with a second one of said adjacent roofs. Each pair of hip rafters is connected at a corresponding one of a pair of common points, and each hip rafter of the first pair of hip rafters has an end portion colinearly aligned with an end portion of a corresponding hip rafter of the second pair. Horizontal or expansion rafters are disposed between such corresponding hip rafters, and a center ridge board member is connected between the pair of common points.With such an arrangement, interior load carrying support structures generally used when connecting different roofs together are eliminated.