Can you see what the problem is with this roof?
The rule of thumb is that hips, purlins and ridge boards are at least 1.5 times the depth of the rafter. In this case the hip could have been deeper but the purlin should have been cut to the detail below and real carpentry skills are needed to do this. That way all of the loads can be transferred safely down the hip to the wall plate.
Please Note: Every care was taken to ensure the information in this article was correct at the time of publication. Any written guidance provided does not replace the reader’s professional judgement and any construction project should comply with the relevant Building Regulations or applicable technical standards. However, for the most up to date LABC Warranty technical guidance please refer to your Risk Management Surveyor and the latest version of the LABC Warranty technical manual.