1940’s bay window damp?

[Dave962399]

We have a 1940’s tile hung bedroom bay window which appears to have black/mold all over the inside, underneath the window.
Have checked the tiles and siliconed any gaps and made sure all flashing is secure.

There also appears to be a shadow of the interior battens showing through.
No evidence of damp on the floorboards below.
Some bright spark decided to artex that wall in the 70’s so to remove it to get a look is going to be hassle. So, before I go down that route is it possible that the tiles have just become pourous overtime and just needs a brush over with a coating?

If that is the case, who do I use? A roofer or builder? (Can’t reach it myself)

Any thoughts or insights please?

 

[Wayners]

Probably no insulation in bay and it's cold and your getting condensation.
Needs insulation
Run dehumidifier in that room for a few hours every evening October to march will control.
Builder or property maintenance company could help.
Is this the sort of bay?

 

[Harry Bloomfield]

That sounds like poorly insulated, causing condensation, rather than actual damp. Insulation wasn't such a priority, in the 1940's.

 

[Dave962399]

Wayners. Same shape but ours is hung tile

 

[Dave962399]

Just don’t get it. Been in the house 26 years and never had it before.
Going to do the old tin foil trick for a few days and see what happens.

 

[Wayners]

Buy a humidity sensor as well.
Maybe your home more. Creating more moisture in the house. It's a problem many are getting now as lifestyles change

 

[Harry Bloomfield]

Just don’t get it. Been in the house 26 years and never had it before.

As time as gone by, everyone has sealed up their homes more, increased the amount of heat, added double glazing. So moisture is retained more in the home, and condenses out on the cooler locations. Obviously, that is a cold spot.

 

[Koolpc]

Post some pics...

 

[Koolpc]

Just don’t get it. Been in the house 26 years and never had it before.
Going to do the old tin foil trick for a few days and see what happens.

Have just recently gotten married?!!

 

[Wayners]

@Koolpc
Ha.
Yeah that will do it.

 

[Dave962399]

@Koolpc