Nail full length of 140x35 double top plate on the exterior walls with 2/100mm galvanised nail and skewed. then nail 75x35 ceiling batten on the side and double plate and passing over the interior walls. in between the ceiling batten on top of the interior walls nail bolcks of double plate for hanging the interior ceiling lining, block must protrude on bothside of top plate for lining fixing.

Ceiling batten will later be nail onto the trusseswith 2/75mm nails