Dampness around window

[dal]

Hi all, so I had a new window fitted about 4 or 5 years ago, not had any problems with it but I'd say in the last 6 months or so when it rains it starts getting damp around both bottom corners of the window ( it's not condensation ).
I went up on the ladders to have a look and the silicone on the outside looked fine but I replaced some of it anyway to see if it made a difference but it didn't. We do have cavity wall insulation so I was wondering if that could be the cause ie maybe water is getting drawn in through the insulation although the window itself does seem the most likely cause.
Has anyone else had this problem or know what the problem could be.
Thanks in advance

Spoiler: photos

 

[ants83]

I can't help but have the same on one of my rooms. Cavity insulation also, but no leaks that I can see. Hopefully someone can help

 

[Deleted User 298457]

Check gutters

 

[dal]

Check gutters

The window is on the gable end wall.

 

[Raymond Lin]

What is the humidity in that room?

 

[Deleted User 298457]

What is the humidity in that room?

Still, if it is tracking into a cavity or something, it can emerge anywhere. You've checked for "leaks" so there isn't many other answers.

 

[Shoza]

Probably a broken cavity tray above window frame.

 

[Chabsy]

Needs a external photo, but it's more likely to be water getting there the ends of the cill.

 

[dal]

Here's a few more photos. I'm really not sure how I'm going to get this sorted. If it is a broken cavity tray how could that be fixed.

Spoiler: Exterior photos

In this photo the end caps are missing but I was under the impression this was just hollow and water would not be
able to get into house + these have always been missing but as I have said in my first post I have only had a problem in the last 6 months or so.

In this photo the gap you see between the window and the brick has now been sealed up although the brickwork overhangs the window anyway.

I have since re siliconed this ( after removing old silicone ) but it's not made any difference

 

[Dalandius]

Quite a large gap above the window?

 

[dal]

Quite a large gap above the window?

Yes it is but the brickwork overhangs the window and I have filled that gap with silicone now.

 

[Deleted User 298457]

Yes it is but the brickwork overhangs the window and I have filled that gap with silicone now.

Whilst your brick hangs over there isn't a drip end so it'd just track in. If you've sealed that it should hopefully give some result. Probably just foam that's decade?

 

[Semple]

Have a look under the sill, we had something similar - our wooden window sill was absorbing the water, but some of it was making its way up the walls. I did find we had two very tiny gaps in the sealant underneath the external sill.

 

[Chabsy]

Could have been coming in above and running down the sides.