Smooth the caulk bead with your finger and begin caulking the joint between the fascia board and the soffit also known as the eave.
Gap between roof tiles and guttering.
Tiles not laid correctly above the guttering.
In fact in most places i was unable to get my fingers never mind my hand into the guttering to clear it.
Builders suggest bird combs fitted along guttering but should there be a gap that birds vermin can get through.
Slowly move down the joint to apply a steady bead of caulk into.
If you see daylight behind all or some sections of guttering then this could be caused by the following.
Sometimes the water shows up at a ceiling spot distant from the leak.
Some roof leaks are tough to locate.
The gap can vary some because the gutters must slope towards the downspout.
A gap in the guttering itself.
If your ceiling has a plastic vapor barrier between the drywall and the attic insulation push the insulation aside and look for flow stains on the plastic often water runs to openings in the vapor barrier such as at ceiling light fixtures.
There is now a 1 2 inch air gap between the roof and the roofing tiles where the gutter guards were.
Guttering installed too low.
A gap behind the guttering that is allowing daylight between the gutter and the fascia.
In almost every instance gutter installers take the path of least resistance and shove the gutter right underneath the roof shingles instead.
Should there be a gap between roof tiles and guttering we have had birds nesting in roof and now possiblity that a rat has been in loft.
Broken tiles directly above the guttering.
Looking right down the line of the guttering the gap between the end of the last roof tile and the outer edge of the guttering varies from around an inch and half to in some cases millimetres.
Any more and you run the risk of water running off the tile and overshooting the gutter.