I too am a bit confused with 'cross nailing'. It could be that the trusses are not nailed from both sides where they join the top plate (the horizontal timbers at the top of the walls) or it could as Stewie has indicated, cross bracing where there is (or should be) metal straps running in a big cross in a number of places over the trusses.
Talk to your inspector, explain the situation and get the details of the regulation clause that he has claimed in error. Try to use your inspector to sort this out. He would be seeing these type of situations every single day!
Also talk to your roof truss supplier as to installation requirements. Get them out to inspect it if things continue to stall.
Without either the clause in the regulations or a clear breach of the installation instructions then your builder is unlikely to move.
Skew nailing/cross nailing. I had a few trusses that needed skew nailing. The major trusses were made as two identicals in 35mm and had to be nailed together on site to make one big truss. Was all in the instructions from the truss company. Specified spacings etc (300mm from memory). As mentioned above, did skew nail each truss to the top plate but then went around with truss grips later as per instalation instructions.
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