Modifying a roof truss places stress on the timber trusses around the modified one as well as changing the load dynamics of the truss itself. The web that was removed from this truss seen below, supported the truss load from the tiled roof above. Removing the nail plate from the other web member on the opposing side has made this truss unstable and likely to distort and collapse. Rectification is urgently required and a structural engineer is required to remedy the situation. As the property is a rental, the duty of care for the tenants family is paramount. Even if it was just a house on the market, it should be pulled from sale until repaired.
Truss plates when trusses are not adequately secured or braced, can pull out, also leaving the webbing loose and the truss able to collapse.
The bent truss shown below is due to an unsupported top chord. Supported by tile battens on one side, but as part of this roof was conventional cut with rafters following a ridge supported by girder trusses, the unsupported side has bowed. The maximum allowable bow is 50mm. No truss should ever be altered in any way from the original design.
Truss plates when trusses are not adequately secured or braced, can pull out, also leaving the webbing loose and the truss able to collapse.
The bent truss shown below is due to an unsupported top chord. Supported by tile battens on one side, but as part of this roof was conventional cut with rafters following a ridge supported by girder trusses, the unsupported side has bowed. The maximum allowable bow is 50mm. No truss should ever be altered in any way from the original design.
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