Learn how inadequate roof truss support can be potentially dangerous.
Dangerous inadequate roof truss support. QBIS.
Wrong method of support:
This is not the correct way to support and secure roof trusses at the junction of a hipped roof.
- Top chords of the hip trusses should have extended over the supporting truncated/girder truss.
- Bottom chord of the truncated roof truss has a large knot in it (nearest the electric cable). This may cause a weak point and possible fracture.
Correct supporting method:
Here are two examples of how the hip trusses should have been constructed.
As you can see the hips are supported by truncated/girder trusses. This method of construction is a much better design as the roof load is more evenly distributed with no fear of collapse.
Dangerous inadequate roof truss support. Important notes:
The supporting roof truss should also have been correctly reinforced.
I have seen this method of roof construction fail, causing the trusses to drop through the ceiling lining of a relatively new house. After it was inspected by another building inspection company!
Roof danger related information:
QBIS: Roof components and location
Roof Technical Information
Tafe: Building terminology
For independent Building Inspections Brisbane in all suburbs, Qld Home Buyers Inspection Service. qbis.com.au