a structural member of a roof, either longitudinal (a purlin) or transverse (a rafter)
a structural member of a roof, either longitudinal (a purlin) or transverse (a rafter)
a structural member of a roof, either longitudinal (a purlin) or transverse (a rafter)
a structural member of a roof, either longitudinal (a purlin) or transverse (a rafter)
a structural member of a roof, either longitudinal (a purlin) or transverse (a rafter)
a structural member of a roof, either longitudinal (a purlin) or transverse (a rafter)
a structural member of a roof, either longitudinal (a purlin) or transverse (a rafter)