In this section we will cover the mechanics of roof loading on structural members. We will show how the plan reviewer can determine the dead loads of typical building materials. Additionally, we will show how roof and ceiling live loads are determined from the residential building code. Additionally, we will also review the code limits for deflection of rafters and ceiling joists and how these limits affect the design process.
This Section covers the sizing and framing of rafters, ceiling joists, rafter ties, collar ties and ridge straps. We will cover all the fastening and connector requirements including connectors needed to resist wind uplift loads.
In this section, we will show that the code requires designers to provide lateral support to the rafter and ceiling joists at bearing points.
We also will cover the guidelines for bridging including the location where bridging is required, the types of bridging and the conditions under which bridging is required.
Additionally, we will look at the limits on notches, cuts and holes on roof framing members. We will also discuss the code requirements for conventional framing of openings.
Finally, we will cover wood structural panels from conformance standards, structural properties, construction specifications and grade stamps.
In this plan review example, we are going to review a set of building plans of a one story conventionally framed building. We will focus on the review of the roof framing including but nt limited to roof sheathing, roof framing, connections and load path.
In this example, we are going to look at how a plan review can review can review manufactured trusses in a project. We will look at an example of truss designed using the Mitek Truss Designer. We will consider gravity loads, wind uplift loading and drag loads. Additionally, we will look at roof framing details that should be incorporated in projects that include manufactured trusses.