What Are Trusses in Attic

An attic truss is a type of roof truss with an open space at its bottom center to accommodate a living space, with webbing above and on either side of this living space. … The roof must bear on the walls defining the floor below the loft area. It cannot bear on knee walls.

Can you have an attic with trusses?

Attic floors are made with floor joists or with truss members. If you have attic trusses (not conventional trusses), the members will be sized to support living space. If you have a rafter-framed attic, the floor joists may or may not be large enough for living space and may need to be reinforced or replaced.

How do you know if you have trusses or rafters?

Rafters contain two main outer beams which support the roof structure. On the other hand, trusses come with multiple beams which add more support. Moreover, as said earlier, the entire weight of the roof is equally shared by a series of triangles inside the main frame.