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Why are my Valley slates not lying flat causing the tiles to lift on either side?

Why are my Valley slates not lying flat causing the tiles to lift on either side?

There are a number of things to check:-

  1. The rafter pitch and the actual pitch of the valley slate on site should be checked ..are they the same

  2. One of the pitches is out therefore a bastard valley should have been used.

  3. The batten gauge is not the same either side of the valley.

  4. The valley does not bisect the angle on plan equally through 45º or 135º which ever way you look at it.

  5. Is the angle on plan 90º?