Structural Steel Roof Framing

The number one choice in the roofing industry for at least 20 years. Traditional timber roofs especially in the case of residential applications often result in a shortened life expectancy because of termite infestations which compromises the integrity of the roofing frame.

Our steel roofs consist mainly of either 2” x 4” or 5” x 3” I-beam rafters held together using wielded connections with either 2” x 4” or 2” x 6” Z purlins bolted onto mild steel cleats. I-beam and Z purlin sizes are primarily determined by the weight of the roof covering and distance spanned without supports. The spacing of the rafters are crucial in choosing the purlins so as to avoid overturning moments caused by gravity loads.

An important rule of thumb when fabricating a steel roof frame is to ensure that all rafters are installed along a level ring beam whilst maintaining a level roof plane.