Water leaking through

[LittleMiss1984]

Hi
Hoping someone can help a damsel in distress I have a bay window which is somehow letting water through to the plaster on the inside - the plaster on the inside was flaking and all powder. I've had the inside replastered (yes, i know i should have fixed the issue first), but i'm not sure quite how to fix the issue on the outside. It looks like some of the bricks need repointing, and also the mortar around the double glazing is all coming away, but i'm not sure what to put on instead, as it's a funny join... Any suggestions? And also any ideas what the white stuff is on the bricks? TIA

 

[Burnerman]

That window has been sealed with a sand/cement fillet that has broken away.....essential to rake it out then repoint where you can, finishing with silicone. If the gap is tight, silicone alone is fine.
Some of those bricks need repointing, and the white stuff is efflorescence of salts leeching out....that isnt important.
Any damaged interior plaster wont recover, Im afraid.
John

 

[bobasd]

you have a gap of 12mm - 15mm below the window frame.
the gap's been filled with sand an cement and a line of silicone an then painted over.

use a steel chisel to hack an rake out all the s&c an a screwfix paint scraper number 19995 to slice off the painted silicone.
the coats of black paint on the stone sill sections are failing an could do with takin back to raw stone an then prepped an repainted.

it might be possible to use sand an cement as a filler in the gap an then cover with a thick layer of polyurethane sealant
the sealant will also be v. good for fillin in joins in the sill.

ther's DPC injection plugs in the lower brickwork - so probly damp problems present in the past.
the joists that rest in the bay walls are at risk of rottin, esp. if the cavity is blocked with rubble.
only one air brick showin in the bay.
if youve replastered with gypsum plaster it probly wont work - damp will come through.
it should be a lime an sand render.

you might have damp comin down from the bad frame sealing - or coming up from rising damp - or from DPC bridging in the cavity?

post photos of inside the bay please. show floor an skirtin an window board.

 

[noseall]

Poor design. Almost looks as though it would have been better to lose that broken (black painted) coping and have a larger window made, that sits on the outer brick-work along with its own plastic sill.

Even a stub sill on that existing window would have fared better.

 

[blup]

Over the years rain has damaged the coping, and in turn penetrated the brickwork below. Adding some kind of drip groove under the coping will prevent a repetition of that and eliminate a major external cause of the damp.

Blup