Just had a room replastered and after it had all dried out we had quite a lot of heavy rain. I have now noticed to wet patches quadrant shaped at the bottom corners of the window frames on the new plaster could it be the outside beading,and if so how do you remove beading to reseal it,is it just stuck in place with silicone (all though it looks ok) or can water leak past the glass unit. There is no water on the inner sill just the damp plaster.
If the window is alu or upvc it could be the drainage holes are non-existent or blocked or it could be rain driving in the edge of the frame.
If the window is wood it could be rain driving in the edge of the frame.
Try applying silicone window around the gap where the frame meets the wall on the outside.
Thanks for the reply Stoneyboy.
My window is plastic and this weekend I removed the beading down sides of window and there was no sealant between frame and wall so filled this gap with silicone then replaced beading with silicone so the sides are well sealed now.
However Saturday night the rain returned and so did the damp patch so is it possible for water to seep down the front of the glazing into the frame and then leak inside onto wall.
Your windows will have been designed to accommodate water ingress into the frame - there should be drainage holes so that this can drain outside the frame. It may be that the drainage holes are blocked or they are not present. Remove the glass and have a look.