Void Behind Bay Window Roof - How bad of an issue is this?

[EinTopaz]

Hi all,

 

Was recently looking at replacing the soffits and facias over a front bay window, on closer inspection It looked like there was potentially a void in the outer skin of the wall that the soffits, facias and the roof of the bay window are covering.

I decided to take some tiles off to have a better look and did indeed find a void in the outer skin of the wall, and to my eyes looks like the void continues through the inner skin too? (though it'd be good for someone to confirm that). Based on the image and video below, how bad of a problem is this? should I get the roof off and seal this void? Reason I ask is because this bay window is for the dining room, notably the coldest room in the house. So perhaps not a coincidence?

 

 

Here's a video that shows the void well :- Hole Video Behind Bay

 

And images too:- 

 

Bay window in question 

 

 

 

 

Void behind the tiled roof.

 

 

 

 

What do you guys think? fine? or bad? or really bad?
 

thanks

 

Ged

Edited yesterday at 16:47 by EinTopaz

[Nickfromwales]

The internal leaf of masonry should be a continuous ‘layer’, so draughts can only travel through the cavity. 
 

What we’re seeing is typical ‘builder quality’ work for that era.  

[Tony L]

3 hours ago, Nickfromwales said:

...typical ‘builder quality’ work for that era

 

& the current era as well, if the builders & architectural technicians I have employed are representative of today's building industry personnel.