Is this damp?

Photo not very clear, but rusted beading ?????, beads tend to be galvanised so don't rust, old ones might not have been, so could be rust.

But what causes rust, yes moisture, so either way its could be damp.

 

We really prefer sharp, in-focus photos on here...

Why would there be beadings in these places? Especially down the LH side of the pic?

The area around the window could be condensation, so not caused by penetrating damp - but very hard to tell from here. The stain down the actual wall, however, is strange. What's on the other side of that wall?

 

I took the lhs to be the return of the window reveal, so would have a beading on the corner.

 

Ah - you're right.

Bimey, I thought that was chust a side wall with a damp stain down t'middle...

 

If it was damp of any significance I would have thought the paint would have blistered, unless it has, photo not clear enough.


Have you tried painting a stain blocker on to the walls and then paint them.

 

Definitely need a better photo with more of the wall in shot.

 

Is this a velux window or just the angle of the picture?

It does look like the bead is rusting, and that shouldn't happen (they're galvanised and can tolerate wet skim until it dries, but not prolonged moisture). Is this a cavity wall or solid?

 

Okay, is it brick or stone on the exterior? Do you know how old the house is? Is this in a bathroom?

There's obviously something going on there. Painting it might just hide it, not fix it. If it's a bathroom it might simply be poor ventilation and condensations is getting into the plaster and corroding the bead...

 

Actually looking again the wall doesn't look thick enough to be stone so I'll assume it's a cavity wall construction. In which case, if this is upstairs (1st floor) it won't be rising damp, it's more likely poor ventilation. As someone else said, prolonged damp will result in blistered paint and eventually mould and efflorescence (salt/powder on walls).

 

Was any bitumen type paint applied to the wall prior to plastering? Probably be okay with a couple of coats of stain block such as Zinsser BIN, Zinser Cover Stain etc.

 

Might have used a stainless angle bead instead of a galvinised one.
Stainless angle bead is only for cement renders, if they used stainless bead & a different metal fixing to attach it, along with the plaster,then you can get Galvanic corrosion, where two metals react to each other, hence the staining.

I don't think Zinser will work in this case, better to replace the angle bead, you can get upvc angle bead, easy job to replace.

 

I think its the bead thats rusting possibly due to moist conditions, try resealing your window on the outside and painting with stain block before removing the bead because it will be cheaper if it works

plasterer doncaster