I) a.Investigate the exterior of that window and take whatever steps are required to make it weatherproof. You don't want to be tilling if its getting wet from outside.
b. If you're satisfied the window is weatherproof, let the plaster dry out on the inside. Any blown plaster will need removing and making good.
2) I wouldn't worry about the concrete? ( do you mean bricks and mortar?) as long as it drys out.
Was there anything situated next to that wet patch which would explain it being wet? Shower, washbasin bath etc.
To be honest, if you think the window is not weatherproof it might be worth biting the bullet and replacing it. Got any photo of the outside?
I) a.Investigate the exterior of that window and take whatever steps are required to make it weatherproof. You don't want to be tilling if its getting wet from outside.
b. If you're satisfied the window is weatherproof, let the plaster dry out on the inside. Any blown plaster will need removing and making good.
2) I wouldn't worry about the concrete? ( do you mean bricks and mortar?) as long as it drys out.
Was there anything situated next to that wet patch which would explain it being wet? Shower, washbasin bath etc.
To be honest, if you think the window is not weatherproof it might be worth biting the bullet and replacing it. Got any photo of the outside?