grout ratio

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    Ridge tile (Marley Modern) - correct ration mortar mix? How much mortar?

    Are ridge tiles supposed to be bedded on mortar along the sides or is just the vertical bit at the ends supposed to be grouted? I do have some on mortar along the long sides, at one end of the house but I suspect that was to bring them up level with the rest. Also, should so much mortar be used...
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