hip and valley roof

valley roof

Changing flat roof to slope roof

diagonal ridge for hip roof，vertical ridge for gable roof

flat- roof-to- slope-roof

flat-roof-to-slope-roof

flat-roof-to-sloping roof

roof pressure roof weight

roof prism (=roof-angle prism)

glacial valley (galical-carved valley)

The super-wisdom valley The Bo Ruo Valley

The super-wisdom valley(The Bo Ruo Valley)

U-shaped valley(U-valley)

valley in valley

Valley-in-Valley

V-shaped valley(V-valley)

10104 m3 floating roof tank

3-D curved roof

absolute roof