Roof with no eaves

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Hi, new to this - I'm replacing concrete interlocking tiles on a gable running back to valley. The gable is flush with adjacent house wall hence has no eaves to speak of. This results in valley mortar meeting verge mortar at a point at the bottom whereas the rest of roof has normal eaves with a gap between the tiles and the underfelt. Can this closed bottom end lead to problems with either circulation or drainage (eg pooling )in bad weather conditions? Should I leave a gap in mortar at lowest point when replacing ?
Most gables seem to jut out so have a short eaves section, mine doesn't. Thanks for any comments
 
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Yep, valley is fine. This sketch may help.
 

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Thanks for your response, but why ? My understanding is that the sag in underfelt and gap between mortar and valley upstand is to allow any moisture on underlay or tile backs to escape. How does this get out of solid bed ?
 
Thanks for your response, but why ? My understanding is that the sag in underfelt and gap between mortar and valley upstand is to allow any moisture on underlay or tile backs to escape. How does this get out of solid bed ?
It's the reason dry valleys were invented. ;)

The need for mortar (wet valleys) supersedes that of other issues. You will have far worse problems if a wet valley is without mortar.
 

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