ABSTRACT
A simple roof comprises a series of sloping timbers (rafters) fixed to a ridge board at the top and a wall plate at the bottom. The wall plate sits on the top of the brickwork and, in traditional construction, is not mechanically fixed in any way. The roof stays in position because, when covered, it weighs several tonnes. To prevent the feet of the rafters pushing outwards they are securely nailed to the ceiling joists. A simple closed-couple roof (as this form is known) can span about 5m.
