I'm currently doing a self build currently and my builder has just finished putting the prefab roof trusses onto the house. After the trusses were put on and he was beginning to put of the felt, he noticed the trusses were not even.
When a line was put on the trusses to indicate how level they were, he found there are dips and rises across the whole roof of anything up to 1 inch. Apparently this wouldn't be a huge issue for anyone putting a tiled roof on, but with a slate this is a disaster.
I was wondering if anyone else had faced this issue and what options are open to me?