Roof Slab Framing Plan

The design of the upper storey extension was a lightweight strut frame structure and after calculations were undertaken it was shown that the slab could not sustain the additional live load.

Roof slab framing plan.

One of the most important parts of building a sturdy roof is the initial roof framing plan. For our 4 x8 lean to example using a 2 4 rafter the depth of the birdsmouth is limited by the 1 3 depth of the rafter rule. The construction of the original building consisted of a reinforced concrete frame with cast in situ trough floors. This will the first point of the rafter measurement line.

Transfers the load of the roof through the raftersto walls below. Roof framing rafter layout from one end of the rafter material using a speed square or framing square mark an x in 12 angle on the rafter and cut it. Roof framing simply describes how a group of rafters and beams are fitted or joined together in order to provide support for the roof covering. An extra floor was required to be constructed which involved converting the original roof slab to a floor slab thereby increasing the live load capacity to 3 kn m 2.

No framing or structural members are to be modified notched or cut without the approval of the engineer. The point at which all the rafters are attached to. Any discrepancies shall be brought to the attention. In order to do roof framing properly it is important to understand the unique shape and dimensions of your roof since these will greatly impact the geometry of the roof frame.

Parts of a roof a ridge board is a horizontal member of the roof frame. Use a framing square to help lay out the notch based on the slope of the roof. Measure down y height from the long point of the rafter cut and make a mark. Fifth roof floor slab layout plan.

Fifth roof floor slab layout plan.